阅读说明：本技术 一种机制砂调节剂及其使用方法 (Machine-made sand regulator and using method thereof ) 是由 郭耀鹏 裴恩 王峰 于 2021-01-13 设计创作，主要内容包括：本申请涉及本申请涉及建筑材料领域,更具体地说,它涉及一种机制砂调节剂及其使用方法,其中一种机智砂调节剂,包括试剂A和试剂B,其中试剂A包括减水剂和引气剂,试剂B包括聚乙二醇、乙二醇和聚二甲基硅氧烷。通过聚乙二醇的柔性分子作用,并添加乙二醇提高整体的黏度,使引气剂产生的微小气泡更好地留存于体系中,进一步提高流动度,进而提高了机制砂的和易性和混凝土整体的加工性能。另外,本申请涉及一种机制砂调节剂的使用方法,将试剂A先与水泥、水和粉煤灰进行混合,再加入试剂B、机制砂、粗骨料等其他试剂,通过两次水化反应,提高得到的混凝土的流动性和强度。(The application relates to the field of building materials, in particular to a machine-made sand regulator and a using method thereof. Through the action of flexible molecules of polyethylene glycol and the addition of ethylene glycol, the overall viscosity is improved, so that micro bubbles generated by the air entraining agent are better kept in a system, the fluidity is further improved, and the workability of machine-made sand and the overall processability of concrete are further improved. In addition, the application relates to a using method of the machine-made sand regulator, the reagent A is firstly mixed with cement, water and fly ash, then the reagent B, the machine-made sand, coarse aggregate and other reagents are added, and the fluidity and the strength of the obtained concrete are improved through two hydration reactions.)

1. The machine-made sand regulator is characterized by comprising a reagent A and a reagent B, wherein the reagent A comprises the following components in parts by mass:

150-200 parts of a water reducing agent;

18-20 parts of an air entraining agent;

the reagent B comprises the following components in parts by mass:

10-30 parts of polyethylene glycol;

7-20 parts of ethylene glycol;

7-15 parts of polydimethylsiloxane.

2. The machine-made sand conditioner of claim 1, wherein: the reagent B further comprises 6-9 parts by mass of maltitol.

3. The machine-made sand conditioner of claim 1, wherein: the reagent A also comprises 0.6-2 parts by mass of sodium bromide and 1.1-1.5 parts by mass of potassium iodide.

4. The machine-made sand regulator according to claim 3, wherein the reagent A further comprises 0.9-2.2 parts by mass of sodium borate.

5. The machine-made sand regulator according to claim 1, wherein the reagent A further comprises 1-4 parts by mass of sodium tripolyphosphate.

6. The machine-made sand conditioning agent according to claim 4, further comprising a reagent C, wherein the reagent C comprises 30-80 parts by mass of reinforcing fibers and 3.3-5 parts by mass of ceramic micro powder.

7. The machine-made sand regulator according to claim 6, wherein the reinforcing fiber is glass fiber and carbon nano tube with the mass ratio of 1 (0.05-0.1).

8. The machine-made sand conditioner of claim 7, wherein said glass fibers are modified with a silane coupling agent.

9. The use method of the machine-made sand regulator as claimed in any one of claims 1 to 8, wherein the method for preparing concrete by using the machine-made sand regulator and machine-made sand comprises the following steps:

s1, dry-mixing the reagent A and the machine-made sand, wherein the mass ratio of the reagent A to the machine-made sand is (0.4-0.8): 100, and obtaining a dry-mixed system;

and S2, mixing the cement with water accounting for 30-45% of the total amount of water, adding the reagent B and the fly ash, stirring at the speed of 50-80 r/min for 6-20S, adding the dry mixing system obtained in the step S1, adding other raw materials, and continuously stirring for 30-120S to obtain the concrete.

10. The use method of the machine-made sand regulator as claimed in claim 9, wherein in step S2, after the dry-mixed system is added to the system of the cement, water, reagent B and fly ash after stirring, the system is stirred for 10-15S at a stirring speed of 50-80 r/min, then the coarse aggregate and the rest of water are added, the stirring speed is kept for stirring for 5-30S, then reagent C is added, the stirring speed is increased to 120-150 r/min, and the stirring is carried out for 15-75S, so as to obtain the concrete.

Technical Field

The application relates to the field of building materials, in particular to a machine-made sand regulator and a using method thereof.

Background

The machine-made sand is a common building material used for replacing river sand at present, and has wide sources, small influence on the environment and easy regulation of gradation, so the machine-made sand has better application prospect as concrete fine aggregate.

In order to improve the fluidity and the workability of the fine aggregate, a certain amount of fine aggregate regulator is often required to be added, so that the fine aggregate has better processing performance and can be more uniformly mixed with other components, and the processed concrete has better strength. The fine aggregate regulator generally contains a certain amount of water reducing agent, and the water reducing agent can be coated outside fine aggregate particles to generate a certain lubricating effect between the fine aggregates and also can introduce a certain amount of micro-bubbles through the mixing of the fine aggregate regulator and the fine aggregates, so that the micro-bubbles play a role of a bearing in a system through the surface activity effect of the water reducing agent, the friction between the fine aggregate particles is reduced, and the fine aggregates have better processing performance.

Above-mentioned technical scheme has the application of making a beautiful face in the river sand, but machine-made sand is different with the river sand, and machine-made sand surface has more edges and corners structure, and is not like the general mellow and honour of river sand, and consequently the difficult distribution of water-reducing agent is even in the system, and the microbubble that produces also breaks easily, and then when leading to machine-made sand as fine aggregate, and the peaceability is relatively weak, and mobility is not strong, and then is difficult to with other composition misce bene, and the intensity that leads to the concrete that makes is not good.

Disclosure of Invention

In order to improve the workability of machine-made sand, the application provides a machine-made sand conditioner and a using method thereof.

In a first aspect, the application provides a machine-made sand regulator, adopts following technical scheme:

a machine-made sand regulator comprises a reagent A and a reagent B, wherein the reagent A comprises the following components in parts by mass:

150-200 parts of a water reducing agent;

18-20 parts of an air entraining agent;

the reagent B comprises the following components in parts by mass:

10-30 parts of polyethylene glycol;

7-20 parts of ethylene glycol;

7-15 parts of polydimethylsiloxane.

In the technical scheme, the air entraining agent is added firstly, the air entraining agent can generate a certain amount of bubbles in a system, the air bubbles can be introduced to generate a better lubricating effect, meanwhile, the system of polyethylene glycol and polydimethylsiloxane is added in the reagent B, the polydimethylsiloxane has a better lubricating effect and a flow effect on the one hand, the lubricating effect can be played between the machine-made sand, and meanwhile, the system can play a certain buffering effect together with the water reducing agent, so that particles in the machine-made sand are not easy to agglomerate. Meanwhile, the polydimethylsiloxane contains oxygen atoms, and can form hydrogen bonds in the subsequent hydration reaction process, so that the overall strength of the concrete is improved.

Polyethylene glycol is used as a basic carrier, and the molecular chain of the polyethylene glycol is mainly flexible, so that the flowability of the machine-made sand can be further improved. In addition, when the ethylene glycol is added into the system, on one hand, the ethylene glycol has certain viscosity, so that the machine-made sand is not easy to crack in the condition of keeping the whole fluidity, no matter mortar is prepared or concrete is prepared, and micro bubbles generated by the air entraining agent can be better reserved in the system, thereby further improving the whole lubricating effect.

In summary, in the above technical solution, by providing a blending system of polyethylene glycol, ethylene glycol and polydimethylsiloxane, when used as an additive, the workability of the machine-made sand can be effectively improved, and the processability of the machine-made sand can be further improved.

Preferably, the reagent B further comprises 6-9 parts by mass of maltitol.

In the technical scheme, the maltitol is additionally added, and the surface of the maltitol has more active groups, so that the crosslinking degree in the system can be improved, and the cracking phenomenon can be reduced in the process of preparing a concrete or mortar system. Although the viscosity of maltitol is higher, the influence of maltitol on the fluidity is actually smaller under the condition of better overall fluidity, on the contrary, because of the cross-linked structure formed by maltitol, the air bubbles generated by air entraining agent can be more durably retained in the system, and the overall fluidity is further improved, so the addition of maltitol can play the effect of improving the fluidity on the contrary.

Preferably, the reagent A also comprises 0.6-2 parts by mass of sodium bromide and 1.1-1.5 parts by mass of sodium bromide

Potassium iodide.

In the technical scheme, the sodium bromide and the potassium iodide can respectively provide bromide ions and iodide ions, the bromide ions and the iodide ions have different sizes and can be used as cores of agglomeration in a machine-made sand particle pattern with a non-size, and the machine-made sand can agglomerate to a certain extent and cover a certain amount of water in the machine-made sand in the process of mixing with water, so that water in the agglomerated machine-made sand can be replaced by the iodide ions and the bromide ions, and more water molecules can be liberated, so that the flowability is improved. Meanwhile, the two materials can also make the prepared concrete or mortar have certain antibacterial effect.

Preferably, the reagent A further comprises 0.9-2.2 parts by mass of sodium borate.

In the technical scheme, the sodium borate can adjust the acidity and alkalinity of the system, adjust the generation rate of hydrated Buddhist sound, and play a certain retarding effect, and meanwhile, the adjusting effect of the sodium borate can enable materials such as sodium bromide, potassium iodide and the like to be better dispersed in a mixed system of machine-made sand, cement and water, and meanwhile, the borate can also reduce the corrosion of bromide ions and iodide ions to metal structures in concrete.

Preferably, the reagent A further comprises 1-4 parts by mass of sodium tripolyphosphate.

The sodium tripolyphosphate has good coupling performance and coordination performance, can play a certain retarding effect, and can also enable silica to be arranged more neatly in the hydration reaction process, reduce cracks formed in the concrete in the condensation process and improve the strength of the concrete in the processing process.

Preferably, the composite material further comprises a reagent C, wherein the reagent C comprises 30-80 parts by mass of reinforcing fibers and 3.3-5 parts by mass of ceramic micro powder.

The strength of the concrete can be improved by the reinforcing effect of the reinforcing fiber, and the ceramic micro powder has better wear resistance and mechanical strength. In addition, the nano silicon carbide ceramic has a catalytic effect, can catalyze the occurrence of hydration reaction, and can be used as a core component of a silicon-calcium-oxygen gel system formed in the hydration reaction, so that the mechanism sand doped with the mechanism sand regulator forms concrete with higher strength in the process of preparing the concrete. Meanwhile, the surface of the ceramic micro powder is generally smooth, and the ceramic micro powder can also play a role in lubricating particles,

preferably, the reinforcing fiber is a glass fiber and a carbon nanotube in a mass ratio of 1 (0.05-0.1).

The glass fiber and the carbon nano tube are mixed for use and doped in the machine-made sand, so that the influence on the fluidity of the machine-made sand can be reduced, the strength of the concrete prepared by using the machine-made sand as the fine aggregate is further improved, and the cracking phenomenon is reduced.

Preferably, the glass fiber is modified by a silane coupling agent.

In the technical scheme, the glass fiber is further modified by the silane coupling agent, so that the coupling performance of the surface of the glass fiber can be improved, a net-shaped coupling structure with a certain crosslinking degree can be formed, and the glass fiber can be crosslinked with other active ingredients (such as ethylene glycol and the like); therefore, when the machine-made sand regulator is added into a concrete system, the overall strength of the concrete can be higher.

In a second aspect, the application provides a use method of a machine-made sand regulator, which adopts the following technical scheme:

the use method of the machine-made sand regulator and the machine-made sand for preparing the concrete together comprises the following steps:

s1, dry-mixing the reagent A and the machine-made sand, wherein the mass ratio of the reagent A to the machine-made sand is (0.4-0.8): 100, and obtaining a dry-mixed system;

and S2, mixing the cement with water accounting for 30-45% of the total amount of water, adding the reagent B and the fly ash, stirring at the speed of 50-80 r/min for 6-20S, adding the dry mixing system obtained in the step S1, adding other raw materials, and continuously stirring for 30-120S to obtain the concrete.

In the technical scheme, the reagent A is dry-mixed before the machine-made sand, when the reagent B is added into a mixed system of water and cement, the mixed system of the cement and the water can be uniformly distributed through stirring, generated bubbles are easy to remain in the system, then the machine-made sand, aggregate and the other part of water are added, the hydration reaction rate is improved through the components in the reagent A, the secondary hydration effect is formed, meanwhile, the overall fluidity and viscous resistance of the system are always in a stable state, the processing performance of the concrete is improved, and meanwhile, the overall mechanical performance of the concrete is also improved.

Preferably, in step S2, after the dry-mixed system is added to the system of the cement, the water, the reagent B and the fly ash after the stirring, the mixture is stirred for 10 to 15 seconds at a stirring speed of 50 to 80r/min, then the coarse aggregate and the rest of the water are added, the stirring speed is kept continuously for stirring for 5 to 30 seconds, then the reagent C is added, the stirring speed is increased to 120 to 150r/min, and the mixture is stirred for 15 to 75 seconds, so as to obtain the concrete.

In the technical scheme, the coarse aggregate and the residual water are added firstly to carry out secondary hydration reaction, the hydration reaction is carried out while stirring in the process, bubbles generated by stirring can be remained in the system, the reagent C is added into the system when the hydration reaction is carried out to a certain degree, the hydration reaction of the residual materials is excited, the degree of the hydration reaction is further improved, meanwhile, the reinforcing fibers in the reagent C are uniformly distributed in the system through rapid stirring, small bubbles in the system are broken and float out, and the strength of the finally obtained concrete is improved.

Detailed Description

The present application will be described in further detail with reference to examples.

In this application, the purchase source and model of a portion of the material are shown in table 1.

TABLE 1 comparison table of purchase sources and models of partial materials

Examples 1 to 24

A machine-made sand regulator comprises a reagent A, a reagent B and a reagent C, wherein the specific components of the reagent A, the reagent B and the reagent C are shown in Table 2.

TABLE 2 ingredient proportion table for examples 1 to 24

TABLE 2 ingredient proportion table for examples 1 to 24

In the above embodiments, the reinforcing fibers are glass fibers.

Examples 25 to 27

A machine-made sand conditioner, which is different from the embodiment 24 in that the combination of glass fiber and carbon nano tube of the reinforced fiber is adopted, and the mass ratio of the glass fiber to the carbon nano tube is 1:0.05, 1:0.1 and 1:0.2

Example 28

A machine-made sand conditioner, which is different from the embodiment 25 in that the glass fiber is modified by a silane coupling agent by the following specific modification operations:

drying the glass fiber at 120 ℃ for 2h, preparing a 2% aqueous solution of a silane coupling agent, adding the glass fiber into the aqueous solution of the silane coupling agent, stirring for 2min, filtering, and drying the modified glass fiber to finish the modification treatment.

For the above examples, comparative examples were set as follows, and comparisons were made.

Comparative examples 1 to 5

A machine-made sand conditioner differing from example 1 in that the components of reagent a, reagent B and reagent C are shown in table 3.

Table 3, ingredient ratio tables of comparative examples 1 to 5

In the following examples and comparative examples, the machine-made sand conditioner referred to in the above examples and comparative examples will be referred to, and further, the method of use thereof will be referred to.

Examples 29 to 56

A using method of a machine-made sand regulator is used for preparing concrete by the machine-made sand regulator and machine-made sand in embodiments 1-28 respectively, and specifically comprises the following steps:

s1, dry-mixing the reagent A and machine-made sand to obtain a dry-mixed system;

and S2, mixing the cement with water accounting for 45% of the total amount of the water, adding the reagent B and the fly ash, stirring for 6S at the speed of 50r/min, adding the dry mixing system, the reagent C (if the reagent C is not added), the coarse aggregate and the rest water, and continuously stirring for 120S at the speed, thereby obtaining the concrete.

Wherein, the reagent A, the reagent B and the reagent C are added according to the mass part ratio, and the mixture ratio of the materials is as follows:

2.5kg of machine-made sand;

1.1kg of cement;

10g of reagent A;

300g of water;

260g of fly ash;

3.5kg of coarse aggregate.

Example 57

A method of using a machine-made sand conditioner, which is different from that of example 56, in that the amount of reagent A added is 20 g.

Example 58

A method of using a machine-made sand conditioner, which is different from that of example 56, in that the amount of reagent A added is 50 g.

Example 59

A method for using a machine-made sand conditioner, which is different from the embodiment 56 in that in step S2, the following method is specifically adopted for processing:

mixing cement, fly ash, reagent B and water accounting for 30% of the total amount of water, stirring at the speed of 50r/min for 6s, adding the dry mixing system, continuing to stir at the speed of 50r/min for 10s, adding the coarse aggregate and the rest water, continuing to stir at the speed for 5s, adding the reagent C, increasing the stirring speed to 120r/min, and stirring for 15s to obtain the concrete.

Example 60

A method for using a machine-made sand conditioner, which is different from the embodiment 59 in that in step S2, the following method is specifically adopted for processing:

mixing cement, fly ash, reagent B and water accounting for 30% of the total amount of water, stirring for 20s at the speed of 80r/min, adding the dry-mixed system, continuing to stir for 15s at the speed of 80r/min, adding the coarse aggregate and the rest water, continuing to stir for 30s at the speed, adding reagent C, increasing the stirring speed to 150r/min, and stirring for 75s to obtain the concrete.

Example 61

A method for using a machine-made sand conditioner, which is different from the embodiment 59 in that in step S2, the following method is specifically adopted for processing:

mixing cement, fly ash, reagent B and water accounting for 30% of the total amount of water, stirring for 6s at the speed of 50r/min, adding the dry mixing system, continuing to stir for 10s at the speed of 50r/min, adding the coarse aggregate and the rest water, continuing to stir for 5s at the speed, adding the reagent C, and continuing to stir for 10s at the stirring speed to obtain the concrete.

Meanwhile, comparative examples were set as follows.

Comparative examples 6 to 10

A method for using the machine-made sand regulator in the embodiments 1 to 27 to prepare concrete together with machine-made sand respectively is different from the embodiment 29 in that the machine-made sand regulator in the comparative examples 1 to 5 is adopted respectively.

Comparative example 11

A method for using a machine-made sand conditioner, which is different from that of example 27, in that all raw materials are directly mixed together and stirred at a speed of 50r/min for 60 seconds to obtain concrete.

Concrete was prepared for examples 29 to 61 and comparative examples 6 to 11, and curing was performed for 28 days to obtain experimental samples 1 to 33 and control samples 1 to 6. The following experiment was performed on the experimental samples 1 to 33 and the control samples 1 to 6.

Experiment 1: concrete slump experiment: the slump of the concrete was measured with reference to GB/T50080-2016.

Experiment 2: concrete compressive strength test: with reference to GBT 50081-.

Experiment 3: and (3) concrete flexural strength experiment: with reference to GBT 50081-.

Experiment 4: the initial setting time and the final setting time of the concrete were measured with reference to GB/T50080-2016.

For the experimental samples 1 to 3 and the comparative samples 1 to 5, experiment 1 was performed, and the results are shown in table 4.

TABLE 4 slump control for Experimental samples 1-3 and comparative samples 1-3

In the above examples and comparative examples, it can be seen that the machine-made sand conditioning agent of examples 1 to 3 prepared by using the formulation components of the present application can greatly improve the workability of machine-made sand and the fluidity of concrete when applied to concrete production, and finally obtain concrete with higher slump and better fluidity. The higher slump means that when the fluidity of the concrete is not required to be high, the amount of water can be further reduced, so that the strength is improved, a larger amount of machine-made sand regulator and water reducer is not required to be added, and the strength of the prepared concrete is further improved.

Further, experiments 1 to 4 were performed on the experimental samples 1 to 13, and the experimental results are shown in table 5.

TABLE 5 and table for comparing experimental results of experimental samples 1-13

In the above examples corresponding to the experimental samples, the reagent components in the reagent a and the reagent B were adjusted, wherein in the experimental sample 4 and the experimental sample 5, maltitol was added, and by the viscosity of maltitol, the overflow and the breakage of air bubbles in the system were reduced, and the slump was slightly improved, and the strength was also better affected. In the experimental samples 6-8, compared with the experimental sample 1, sodium bromide and potassium iodide are added, so that the fluidity of the machine-made sand is improved, and the strength of the finally prepared concrete is improved to a certain extent. In the samples 9 to 10, sodium borate is further added, so that the fluidity of the prepared concrete is further improved, the strength of the concrete is also positively influenced, and a certain retarding effect is achieved.

In the experimental samples 11-12, sodium tripolyphosphate is added, so that the crosslinking degree of the system is further improved, and the compressive strength is improved to a small extent, and the flexural strength is also improved to a large extent. In the experimental sample 13, the reagent a and the reagent B both adopt a better implementation mode, so that the finally obtained concrete has better processability and strength performance, and the mechanical sand regulator used in the application is proved to be capable of effectively regulating the workability of the mechanical sand and simultaneously improving the strength of the concrete.

Further, the results of experiments 1 to 4 were carried out on the experimental samples 14 to 28, and are shown in Table 6.

TABLE 6 and table for comparing experimental results of experimental samples 14-28

In the corresponding embodiment of the experimental samples 14-16, the reagent C is additionally added, the strength of the prepared concrete can be effectively improved by the aid of the reinforcing fibers and the ceramic micro powder added in the reagent C, the ceramic micro powder can also have an effect similar to air bubbles in the concrete, and the workability of machine-made sand and the overall fluidity of the concrete are improved, so that the concrete has better processing performance. In examples 17 to 18, sodium bromide and potassium iodide were added separately from example 1, and the lubricating effect and reinforcing effect were not significant in the corresponding examples 17 to 18. In the experimental sample 19, compared with the example 1, the organic sand regulator used in the method only adds the reinforcing fiber, and has a certain strength improvement effect, but has a negative influence on the fluidity of the concrete. Compared with the embodiment 1, the machine-made sand regulator used in the experimental samples 20-23 uses the polycarboxylic acid water reducing agent and the calcium lignosulfonate water reducing agent with different proportions, and finds that when the polycarboxylic acid water reducing agent and the calcium lignosulfonate water reducing agent are mixed in a ratio of 100:80, machine-made sand has good workability, strength is also well improved, the proportion of the calcium lignosulfonate water reducing agent is continuously increased, so that flowability is poor, the strength is not obviously improved, even the machine-made sand is reduced due to non-uniformity of the machine-made sand, the phenomenon may occur due to the fact that the lengths of molecular chains of the polycarboxylic acid water reducing agent and the calcium lignosulfonate water reducing agent are different, the molecular chains with different lengths can enable the machine-made sand particles to have a relatively disordered arrangement mode, and the formed lubricating effect is good.

Furthermore, in the machine-made sand conditioner used in the experimental samples 25-27, the reinforcing fiber adopts the combination of the glass fiber and the carbon nano tube, the carbon nano tube has better strength, and the carbon nano tube with the impurity amount ratio of 0.05-0.1 is doped in the glass fiber, so that the toughness of the prepared concrete is enhanced, and the slump is also improved. In the experimental sample 28, after the surface silanization treatment is performed on the glass fiber, the fluidity of the whole concrete is slightly reduced, but the strength of the concrete is greatly improved, and the effect of improving the strength of the concrete has a good practical application value under the condition that the conditioning agent can obviously improve the workability of the machine-made sand.

Further, experiments 1 to 4 were carried out for the experimental samples 29 to 33 and the comparative sample 6, and the results are shown in Table 7.

TABLE 7, Experimental results comparison tables of Experimental samples 29 to 33 and comparative sample 7

In the embodiment corresponding to the experimental sample, the use method of the machine-made sand regulator is adjusted, and it can be proved that compared with the mode that all materials are mixed together, the reagent A, the cement, the water and the fly ash are firstly added for carrying out the primary hydration reaction, and then other materials are added for carrying out the secondary hydration reaction, cracks in formed concrete are fewer, and the breaking strength is obviously improved. In addition, on the basis, the reagent B and the reagent C are respectively added, and the stirring speed is increased after the reagent C is added, so that gaps in finally formed concrete can be further reduced, and the overall breaking strength can be further improved.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.