阅读说明：本技术 一种超缓凝混凝土及其制备方法 (Super-retarding concrete and preparation method thereof ) 是由 马伍平 于 2021-07-12 设计创作，主要内容包括：本申请涉及混凝土生产的领域,具体公开了一种超缓凝混凝土及其制备方法。超缓凝混凝土包括聚对苯二甲酸乙二醇酯树脂、乙二胺四乙酸、缓凝剂、砂、水泥、水、石子、减水剂、粉煤灰；其制备方法为：首先将水泥、水、减水剂、缓凝剂混合均匀得到第一混合物,然后将砂、粉煤灰、石子添加至第一混合物中混合均匀得到第二混合物,最后将剩余原料组分添加至第二混合物中混合均匀即得到超缓凝混凝土。本申请具有减少混凝土在长距离运输时出现凝结情况的效果。(The application relates to the field of concrete production, and particularly discloses super-retarding concrete and a preparation method thereof. The super-retarding concrete comprises polyethylene glycol terephthalate resin, ethylene diamine tetraacetic acid, a retarder, sand, cement, water, stones, a water reducing agent and fly ash; the preparation method comprises the following steps: the method comprises the steps of firstly, uniformly mixing cement, water, a water reducing agent and a retarder to obtain a first mixture, then adding sand, fly ash and stones into the first mixture to be uniformly mixed to obtain a second mixture, and finally adding the rest raw material components into the second mixture to be uniformly mixed to obtain the super-retarding concrete. This application has the effect that the condition of condensing appears when reducing the concrete long distance transportation.)

1. The super-retarding concrete is characterized by being prepared from the following raw materials in parts by weight:

polyethylene terephthalate resin: 1-5 parts;

ethylene diamine tetraacetic acid: 4.5-7 parts;

retarder: 2-6 parts;

sand: 650-750 parts;

cement: 240-340 parts;

water: 130-190 parts of a solvent;

stone: 850-1100 parts;

water reducing agent: 5-12 parts of a stabilizer;

fly ash: 85-110 parts.

2. The super set retarding concrete of claim 1, wherein: the retarder is 3-5 parts by weight, the ethylene diamine tetraacetic acid is 5-6 parts by weight, and the polyethylene glycol terephthalate resin is 2-3.5 parts by weight.

3. The super set retarding concrete of claim 1, wherein: the raw materials also comprise aluminum silicate fibers, and the weight portion of the aluminum silicate fibers is 1.5-3.5.

4. The super set retarding concrete of claim 2, wherein: the retarder is one of sodium gluconate and glucose sulfonate.

5. The super set retarding concrete according to claim 4, wherein: the water reducing agent is one of a calcium lignosulfonate water reducing agent, a sulfonated melamine formaldehyde resin water reducing agent and a sodium methallyl sulfonate water reducing agent.

6. The super set retarding concrete of claim 1, wherein: the fineness modulus of the sand is 3.0-2.3.

7. The super set retarding concrete of claim 1, wherein: the fineness of the fly ash is two levels.

8. The super set retarding concrete of claim 1, wherein: the cement is composite portland cement.

9. A method for manufacturing the ultra-retarded concrete, which is used for preparing the ultra-retarded concrete as claimed in any one of claims 1-2 and 4-8, and is characterized by comprising the following steps:

the method comprises the following steps: mixing cement, water, a water reducing agent and a retarder, stirring for 1.5-2 h, and uniformly mixing to obtain a first mixture; step two: adding sand, fly ash and stones into the first mixture, stirring for 0.5-1 h, and uniformly mixing to obtain a second mixture;

step three: and adding the rest raw material components into the second mixture, heating and stirring for 1-2 h, and uniformly mixing to obtain the super-retarding concrete.

10. The method for preparing the ultra-retarding concrete as claimed in claim 9, wherein 1.5 to 3.5 parts by weight of aluminum silicate fiber is added in the third step.

Technical Field

The application relates to the field of concrete production, in particular to super-retarding concrete and a preparation method thereof.

Background

The common concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening.

The concrete at present is mainly divided into two stages and states: plastic state before setting and hardening, namely fresh concrete or concrete mixture; the hard state after hardening, i.e. hardened concrete. When carrying out the concrete construction summer, often need use the pipeline to carry the concrete of low department to eminence and pour, because current concrete sets up when the temperature is higher easily sooner, in order to reduce the condition that the pipeline appears blockking up, consequently often need add the retarder in current concrete and delay the concrete and set up in the pipeline.

Although the existing concrete can achieve a certain retarding effect after the retarder is added, when the concrete needs to be transported for a long distance, the concrete is often condensed in the way of transporting for a long distance due to the fact that the retarding effect of the retarder on the concrete cannot meet the requirement, and conveying of the concrete by a pipeline is affected.

Disclosure of Invention

In order to effectively reduce the coagulation of concrete in long-distance transportation, the application provides super-retarding concrete and a preparation method thereof.

In a first aspect, the application provides an ultra-retarding concrete, which adopts the following technical scheme:

the super-retarding concrete is prepared from the following raw materials in parts by weight:

polyethylene terephthalate resin: 1-5 parts;

ethylene diamine tetraacetic acid: 4.5-7 parts;

retarder: 2-6 parts;

sand: 650-750 parts;

cement: 240-340 parts;

water: 130-190 parts of a solvent;

stone: 850-1100 parts;

water reducing agent: 5-12 parts of a stabilizer;

fly ash: 85-110 parts.

Through adopting above-mentioned technical scheme, the cooperation between retarder and ethylenediamine tetraacetic acid, the polyethylene glycol terephthalate resin can effectual extension hydration reaction time, reaches the purpose of the initial set time and the final set time of increase concrete to can be favorable to reducing the condition that the concrete appears condensing when long distance transport, the workman of being convenient for uses the pipeline to carry out long distance's transport to the concrete.

Regarding the phenomenon of performance enhancement, the inventor guesses that after the retarder is added, the retarder reacts with the intermediate of the hydration product in the cement and precipitates are generated on the surface of the intermediate to delay the hydration reaction speed and prolong the setting time of the concrete to a certain extent, after the ethylene diamine tetraacetic acid is added, the ethylene diamine tetraacetic acid can be rapidly dissolved and dispersed in a system under the heating condition, then the metal cations in the concrete can be rapidly chelated by the chelating property of the ethylene diamine tetraacetic acid, the reactant of the hydration reaction of the cement is reduced, and the purpose of further prolonging the setting time of the concrete is achieved, in addition, the added polyethylene terephthalate resin can form a cross-linked network structure, and wraps the chelated metal cations to further enhance the stability of the chelated metal cations, meanwhile, the viscosity of the system can be effectively enhanced through the polyethylene glycol terephthalate resin, so that the sediment on the surface of the intermediate body can more stably cover the surface of the intermediate body, the speed of hydration reaction is better delayed, the effect of further delaying the concrete coagulation is achieved, and the concrete has great economic value.

Preferably, the retarder is 3-5 parts by weight, the ethylenediamine tetraacetic acid is 5-6 parts by weight, and the polyethylene terephthalate resin is 2-3.5 parts by weight.

By adopting the technical scheme, when the inventor further mixes the weight ratio of the retarder, the ethylene diamine tetraacetic acid and the polyethylene terephthalate resin, the hydration reaction time of the concrete can be further prolonged, and the initial setting time and the final setting time of the concrete are both increased to a certain extent.

Preferably, the raw materials also comprise aluminum silicate fibers, and the weight part of the aluminum silicate fibers is 1.5-3.5 parts.

By adopting the technical scheme, after the aluminum silicate fibers are added, the aim of further prolonging the hydration of the concrete can be achieved, so that the whole setting time of the concrete can be effectively delayed, and the long-distance transportation of the concrete is facilitated.

Preferably, the retarder is one of sodium gluconate and glucose sulfonate.

By adopting the technical scheme, one of the sodium gluconate and the glucose sulfonate is selected, so that the synergistic effect of the retarder, the ethylene diamine tetraacetic acid and the polyethylene glycol terephthalate resin can be further enhanced, and the initial setting time and the final setting time of concrete can be further increased.

Preferably, the water reducing agent is one of a calcium lignosulfonate water reducing agent, a sulfonated melamine formaldehyde resin water reducing agent and a sodium methallyl sulfonate water reducing agent.

By adopting the technical scheme, one of a calcium lignosulfonate water reducing agent, a sulfonated melamine formaldehyde resin water reducing agent and a sodium methallyl sulfonate water reducing agent is selected, so that the effect of the water reducing agent in a system can be effectively improved, the initial setting time and the final setting time of concrete can be effectively improved, the integral mechanical property of the concrete can be better enhanced, and the cement is more compact to a certain extent.

Preferably, the fineness modulus of the sand is 3.0 to 2.3.

By adopting the technical scheme, after the inventor selects the sand with the fineness modulus of 3.2-2.3 for adding, the purpose of further prolonging the initial setting time and the final setting time of the concrete can be achieved, so that the concrete can be better and conveniently conveyed for a long distance.

Preferably, the fineness of the fly ash is two levels.

By adopting the technical scheme, after the fly ash with the fineness of two levels is selected by an inventor to be added, the workability of concrete can be effectively improved, so that the synergistic effect of the retarder, the ethylene diamine tetraacetic acid and the polyethylene glycol terephthalate resin can be better improved, and the condensation speed of the concrete can be further delayed.

Preferably, the cement is composite portland cement.

By adopting the technical scheme, the composite portland cement is selected, so that the synergistic effect of the retarder, the ethylene diamine tetraacetic acid and the polyethylene glycol terephthalate resin can be more effectively exerted, the initial setting time and the final setting time of the concrete are further prolonged, and the effect of being favorable for long-distance transportation of the concrete is achieved.

In a second aspect, the present application provides a method for manufacturing super-retarding concrete, which adopts the following technical scheme:

a manufacturing method of super-retarding concrete comprises the following steps:

the method comprises the following steps: mixing cement, water, a water reducing agent and a retarder, stirring for 1.5-2 h, and uniformly mixing to obtain a first mixture;

step two: adding sand, fly ash and stones into the first mixture, stirring for 0.5-1 h, and uniformly mixing to obtain a second mixture;

step three: and adding the rest raw material components into the second mixture, heating and stirring for 1-2 h, and uniformly mixing to obtain the super-retarding concrete.

By adopting the steps to manufacture the ultra-retarding concrete, the synergistic effect of the retarder, the ethylene diamine tetraacetic acid and the polyethylene glycol terephthalate resin can be fully exerted, so that the concrete meeting the requirements can be manufactured more effectively.

Preferably, in the third step, 1.5 to 3.5 parts by weight of aluminum silicate fiber is added together.

By adopting the technical scheme, the aluminum silicate fiber is added along with the ethylene diamine tetraacetic acid and the polyethylene glycol terephthalate resin, so that the effect of the aluminum silicate fiber can be better exerted, and the super-retarding concrete meeting the production requirement can be favorably manufactured.

In summary, the present application has the following beneficial effects:

1. through the cooperative matching of the retarder, the ethylene diamine tetraacetic acid and the polyethylene glycol terephthalate resin, the hydration reaction time of the concrete can be effectively prolonged, and the purpose of increasing the initial setting time and the final setting time of the concrete is achieved, so that the coagulation condition of the concrete during long-distance transportation can be effectively reduced, and workers can conveniently use pipelines to convey the concrete for a long distance;

2. after the aluminum silicate fibers are added, the aim of further prolonging the hydration of the concrete can be achieved, so that the setting time of the whole concrete can be effectively delayed, and the long-distance transportation of the concrete is facilitated;

3. the method has the advantages that the specified steps are adopted to manufacture the ultra-retarding concrete, so that the synergistic effect of the retarder, the ethylene diamine tetraacetic acid and the polyethylene terephthalate resin can be fully exerted, and the concrete meeting the requirements can be manufactured more effectively.

Detailed Description

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

TABLE 1 sources and types of raw materials

Name of raw materials	Model number	Manufacturer of the product
			Pozzolanic portland cement	P.P32.5	Bing coal commerce and trade company Limited
Portland slag cement	/	Shanhengxuan-Yingpin ShangMao Co Ltd
			Calcium lignosulfonate water reducing agent	/	Jinan Hui chemical Co Ltd
Sulfonated melamine formaldehyde resin water reducing agent	/	Qingdao Dingchang New Material Co Ltd
			Sodium methallyl sulfonate water reducing agent	/	Shandong Guangshi electronic technology Co Ltd
Sodium gluconate	Industrial grade	Suzhou Ming Chuan chemical technology Co Ltd
			Glucose sulfonate	Industrial grade	Chemical technology Co Ltd
Polyethylene terephthalate resin	/	Ningbo brocade hong plastication Co Ltd
			Ethylenediaminetetraacetic acid	/	Guangzhou Qingchen Biotech Co Ltd

Example 1

The super-retarding concrete is prepared by the following steps:

the method comprises the following steps: mixing pozzolanic portland cement, water, a calcium lignosulfonate water reducing agent and sodium gluconate, stirring at a rotation speed of 90r/min for 2 hours, and uniformly mixing to obtain a first mixture;

step two: adding sand, fly ash and stones into the first mixture, stirring for 0.5h at the rotation speed of 110r/min, and uniformly mixing to obtain a second mixture;

step three: and adding the rest raw material components into the second mixture, heating to 250 ℃ at the rotation speed of 110r/min, stirring for 1h, and uniformly mixing to obtain the super-retarding concrete.

Example 2

The super-retarding concrete is prepared by the following steps:

the method comprises the following steps: mixing slag portland cement, water, a sulfonated melamine formaldehyde resin water reducing agent and glucose sulfonate at a rotation speed of 90r/min, stirring for 1.5h after mixing, and uniformly mixing to obtain a first mixture;

step two: adding sand, fly ash and stones into the first mixture, stirring for 1h at the rotation speed of 110r/min, and uniformly mixing to obtain a second mixture;

step three: and adding the rest raw material components into the second mixture, heating to 250 ℃ at the rotation speed of 110r/min, stirring for 2h, and uniformly mixing to obtain the super-retarding concrete.

Example 3

The super-retarding concrete is prepared by the following steps:

the method comprises the following steps: mixing pozzolanic portland cement, water, a sodium methallylsulfonate water reducing agent and glucose sulfonate, stirring at a rotation speed of 90r/min for 1.8h, and uniformly mixing to obtain a first mixture;

step two: adding sand, fly ash and stones into the first mixture, stirring for 0.8h at the rotation speed of 110r/min, and uniformly mixing to obtain a second mixture;

step three: and adding the rest raw material components into the second mixture, heating to 250 ℃ at the rotation speed of 110r/min, stirring for 1.5h, and uniformly mixing to obtain the ultra-retarded concrete.

In examples 1 to 3, one of sodium gluconate and glucose sulfonate was used as the retarder in sequence.

In examples 1 to 3, the water reducing agent was one of a calcium lignosulfonate water reducing agent, a sulfonated melamine formaldehyde resin water reducing agent, and a sodium methallyl sulfonate water reducing agent in this order.

In examples 1 to 3, the sand was one of fineness modulus of 3.7 to 3.1, 2.2 to 1.6, and 1.5 to 0.7 in order.

In examples 1 to 3, either of pozzolanic portland cement and portland slag cement was used as the cement in this order.

In examples 1 to 3, the fly ash was used in the order of fineness of one of class I and class III.

TABLE 2-specific inputs (in kg) of the raw material components in examples 1 to 3

Example 4

A super-retarding concrete, which is different from that of example 3 in that the amount of polyethylene terephthalate resin added was 2kg, the amount of ethylenediaminetetraacetic acid was 5kg, and the amount of glucose sulfonate was 5 kg.

Example 5

An ultra-retarded concrete which is different from that in example 3 in that the amount of polyethylene terephthalate resin added was 3.5kg, the amount of ethylenediaminetetraacetic acid was 6kg, and the amount of glucose sulfonate was 3 kg.

Example 6

An ultra-retarded concrete which is different from that in example 3 in that the amount of polyethylene terephthalate resin added was 2.5kg, the amount of ethylenediaminetetraacetic acid was 5.7kg, and the amount of glucose sulfonate was 4 kg.

Example 7

The super-retarding concrete is different from the concrete in the embodiment 6 in that the raw materials also comprise aluminum silicate fibers, and in the third step, the aluminum silicate fibers with the mass of 3.5kg are added together.

Example 8

The super-retarding concrete is different from the concrete in the embodiment 6 in that the raw materials also comprise aluminum silicate fibers, and in the third step, 1.5kg of aluminum silicate fibers are added together.

Example 9

The super-retarding concrete is different from the concrete in the embodiment 6 in that the raw materials also comprise aluminum silicate fibers, and in the third step, the aluminum silicate fibers with the mass of 2kg are added together.

Example 10

An ultra-retarding concrete, which is different from the concrete in example 9 in that sand is added with the fineness modulus of 3.0-2.3.

Example 11

The super-retarding concrete is different from the concrete in example 10 in that fly ash with the fineness of II grade is selected and added.

Example 12

An ultra-retarding concrete, which is different from the concrete in example 11 in that the cement is added by using composite portland cement.

Comparative example

Comparative example 1

An ultra-retarded concrete, which is different from the concrete of example 3 in that the polyethylene terephthalate resin is replaced by equal amount of stones.

Comparative example 2

An ultra-retarding concrete, which is different from the concrete in example 3 in that the ethylenediamine tetraacetic acid is replaced by equal amount of stones.

Comparative example 3

An ultra-retarding concrete, which is different from the concrete in example 3 in that the glucose sulfonate is replaced by equal amount of stones.

Comparative example 4

The super-retarding concrete is different from the concrete in example 3 in that the polyethylene terephthalate resin, the ethylene diamine tetraacetic acid and the glucose sulfonate are replaced by equal amount of stones.

Performance test

The initial setting time and the final setting time (h) of the ultra-retarded concrete prepared in examples 1 to 12 and comparative examples 1 to 4 were measured according to GB/T1346-2001 "test method for Water consumption, setting time and stability for Standard consistency of Cement".

TABLE 3 summary of test data for examples 1-12 and comparative examples 1-4

According to the comparison of the test data of example 3 and comparative examples 1-4 in table 3, when the inventor adds three of glucose sulfonate, ethylene diamine tetraacetic acid and polyethylene terephthalate resin to concrete at the same time, the initial setting time and the final setting time of the concrete can be effectively increased through the synergistic cooperation of the three, so that the coagulation of the concrete during long-distance transportation can be effectively reduced, and workers can conveniently use pipelines to transport the concrete for a long distance.

From the comparison of the test data of examples 3 to 6 in table 3, it is understood that when the mixing ratio of the glucose sulfonate, the ethylenediaminetetraacetic acid and the polyethylene terephthalate resin is adjusted to an appropriate range, the synergistic effect of the glucose sulfonate, the ethylenediaminetetraacetic acid and the polyethylene terephthalate resin can be further improved, and the initial setting time and the final setting time of the concrete can be further improved.

According to the comparison of the test data of the examples 6 to 9 in the table 3, the inventor can enhance the synergistic effect among the glucose sulfonate, the ethylene diamine tetraacetic acid and the polyethylene terephthalate resin to a certain extent when the aluminum silicate fiber is added into the concrete, so that the initial setting time and the final setting time of the concrete can be effectively improved, and the purpose of conveniently conveying the concrete is achieved.

As can be seen from the comparison of the test data of examples 9-10 in Table 3, when the sand with the fineness modulus of 3.0-2.3 is selected by the inventor for addition, the initial setting time and the final setting time of the concrete can be increased more effectively, so that the long-distance conveying of the concrete by workers can be further facilitated.

As can be seen from the comparison of the test data of examples 10-11 in Table 3, when the fly ash with the fineness of class II is selected by the inventor for addition, the initial setting time and the final setting time of the concrete are increased to a certain extent.

According to the comparison of the test data of examples 11-12 in table 3, the inventor selects the composite portland cement to be added to the concrete, so that the synergistic effect among the three resins of glucose sulfonate, ethylene diamine tetraacetic acid and polyethylene terephthalate can be further improved, the initial setting time and the final setting time of the concrete can be effectively increased, the coagulation of the concrete during long-distance transportation can be reduced, and the economic value is great.

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.