阅读说明：本技术 一种lc全轻混凝土及其制备方法 (LC (liquid Crystal) all-light concrete and preparation method thereof ) 是由 李海斌 熊还超 张朋 詹赡 陈亮 于 2020-11-21 设计创作，主要内容包括：本申请公开了一种LC全轻混凝土,属于混凝土制备的技术领域,其技术要点在于：包括以下重量份数计的各组分：陶粒：900-1160份；细砂：600-780份水泥：310-380份；减水剂：8.5-10.2份；粉煤灰：80-100份；矿粉：110-130份；硅灰：40-55份；单氟磷酸钠：2.8-3.4份；增强纤维：9-12份。本申请实现了增强混凝土内部的韧性,提高了混凝土抗压、抗裂的能力,进而整体增强混凝土的强度。(The application discloses LC all-light concrete belongs to the technical field of concrete preparation, and its technical essential lies in: the paint comprises the following components in parts by weight: ceramsite: 900 portion and 1160 portion; fine sand: 600-780 parts of cement: 310-380 parts; water reducing agent: 8.5-10.2 parts; fly ash: 80-100 parts of a binder; mineral powder: 110-130 parts; silica fume: 40-55 parts; sodium monofluorophosphate: 2.8-3.4 parts; reinforcing fibers: 9-12 parts. The concrete reinforcing method and the concrete reinforcing device have the advantages that the toughness inside the concrete is enhanced, the compression resistance and crack resistance of the concrete are improved, and the strength of the concrete is integrally enhanced.)

1. An LC all-light concrete is characterized in that: the paint comprises the following components in parts by weight:

ceramsite: 900 portions of 1160 materials

Fine sand: 600-780 parts

Cement: 310 portions to 380 portions

Water reducing agent: 8.5 to 10.2 portions of

Fly ash: 80 to 100 portions of

Mineral powder: 110-130 parts

Silica fume: 40-55 parts of

Sodium monofluorophosphate: 2.8 to 3.4 portions of

Reinforcing fibers: 9-12 parts.

2. The LC all-light concrete according to claim 1, wherein: the paint comprises the following components in parts by weight:

ceramsite: 1041 parts of

Fine sand: 697 parts of

Cement: 336 portions of

Water reducing agent: 9.42 parts of

Mineral powder: 118 portions of

Fly ash: 88 portions of

Silica fume: 47 parts of

147 parts of water

Sodium monofluorophosphate: 3 portions of

Reinforcing fibers: 10.1 parts.

3. The LC all-light concrete according to claim 1, wherein: the reinforced fiber adopts polypropylene fiber.

4. The LC all-light concrete according to claim 1, wherein: the ceramsite adopts continuous gradation.

5. The LC all-light concrete according to claim 1, wherein: the ceramsite is crushed stone type shale ceramsite.

6. The LC all-light concrete according to claim 1, wherein: the solid content of the adopted water reducing agent is 20 percent, and the water reducing rate is 35 percent.

7. The method for preparing LC all-light concrete according to any one of claims 1 to 6, characterized in that:

s1: putting cement, mineral admixture, ceramsite, water reducer and sodium monofluorophosphate into a concrete mixer for stirring to obtain a primary mixed material;

s2: and (3) putting the fine sand and the reinforcing fiber into the primary mixed material obtained in the step S1, and stirring to obtain the LC lightweight concrete.

8. The method for preparing LC all-light concrete according to claim 7, characterized in that: step S1 includes the following steps:

s 1: the cement, the mineral admixture and the shale ceramsite are dry-mixed in a concrete mixer and uniformly stirred to obtain a primary mixed dry material;

s 2: and (4) adding 80% of the required water into the primary mixed dry material obtained in the step s1, uniformly stirring, adding the water reducing agent and the rest 20% of water without stopping the concrete mixer after stirring, continuously stirring after adding, and uniformly stirring to form the primary mixed material.

Technical Field

The application relates to the technical field of concrete preparation, in particular to LC (liquid Crystal) all-light concrete and a preparation method thereof.

Background

LC full light concrete is also called light aggregate concrete, and the concrete prepared by adopting light coarse aggregate and light fine aggregate is widely applied to industrial and civil buildings and other projects, and can reduce the self weight of the structure; the anti-seismic performance of the structure is improved; the material consumption is saved; the component transportation and hoisting efficiency is improved; reducing foundation load and improving building functions (heat preservation, heat insulation, fire resistance and the like).

However, for LC lightweight concrete, in order to ensure the thermal insulation effect of the concrete, such concrete is often prepared from a material with a lower density, so that the concrete has a lower thermal conductivity coefficient and a better thermal insulation effect, and further, most of the LC lightweight concrete has a lower strength, and cannot be effectively used in a building structure requiring stronger support, which needs to be further improved.

Disclosure of Invention

In order to realize that the LC lightweight concrete has relatively high structural strength, the application provides the LC lightweight concrete and the preparation method thereof.

In a first aspect, the present application provides an LC all-light concrete, which adopts the following technical scheme:

the LC all-light concrete comprises the following components in parts by weight: ceramsite: 900 portion and 1160 portion; fine sand: 600-780 parts; cement: 310-380 parts; water reducing agent: 8.5-10.2 parts; mineral admixture: 230-285 parts; water of 135-165 parts; 80-100 parts of fly ash; 110 portions and 130 portions of mineral powder; 40-55 parts of silica fume; reinforcing fibers: 9-12 parts of a solvent; sodium monofluorophosphate: 2.8 to 3.4 portions.

By adopting the technical scheme, the performance detection result shows that the reinforcing fiber can effectively improve the final compressive strength of the LC lightweight concrete by adding the sodium monofluorophosphate when the LC lightweight concrete is manufactured while improving the structural strength of the LC lightweight concrete, and the sodium monofluorophosphate is a high-viscosity high-molecular compound. It is different from starch, cellulose, etc. in that it has carboxyl group and is high polyuronic acid formed by glycosidic bond of aldehyde group of beta-D-mannuronic acid. Therefore, the concrete glue can be well assisted, and the acting force in the concrete can be favorably increased. And the linear polyelectrolyte can also enhance the toughness in the concrete and improve the compression resistance and crack resistance of the concrete. In addition, sodium monofluorophosphate is a good emulsifier and dispersant, can help various materials in the concrete to be quickly, uniformly and quickly dispersed, is a strong stabilizer, and is favorable for improving the stability of the concrete.

Further setting the following steps: the paint comprises the following components in parts by weight: ceramsite: 1041 parts of (B); fine sand: 697 parts of (1); cement: 336 parts of a raw material; water reducing agent: 9.42 parts; mineral powder: 118 parts of; fly ash: 88 parts of (C); silica fume: 47 parts of; 147 parts of water; reinforcing fibers: 10.1 parts; sodium monofluorophosphate: and 3 parts.

By adopting the technical scheme, the performance detection result shows that the LC lightweight concrete prepared by the components in parts by weight has the best compression and crack resistant effects.

Further setting the following steps: the reinforced fiber adopts polypropylene fiber.

By adopting the technical scheme, the combination performance detection result can obviously show that the compression resistance effect of the prepared concrete can be obviously improved after the polypropylene fiber is added.

Further setting the following steps: the ceramsite adopts continuous gradation.

By adopting the technical scheme, the gaps among the continuous graded particles are smaller than those among the discontinuous graded particles, and finally the prepared concrete aggregate particles are relatively tighter, so that the concrete aggregate particles have better structural strength and better pressure resistance.

Further setting the following steps: the ceramsite is crushed stone type shale ceramsite.

By adopting the technical scheme and combining performance detection data, the compressive strength of finally prepared concrete can be effectively improved when the adopted ceramsite is the crushed stone type shale ceramsite under the condition that other components and the preparation method are not changed. The result is that the single particle of the crushed stone type shale ceramsite has larger surface area and water absorption capacity than the conventional ceramsite, and the pores on the ceramsite are mostly of a triangular structure, so that the ceramsite particles have higher strength, and finally, the concrete obtained after the crushed stone type shale ceramsite is bonded with other ceramsite by combining a cementing material has larger compressive strength.

Further setting the following steps: the solid content of the adopted water reducing agent is 20 percent, and the water reducing rate is 35 percent.

By adopting the technical scheme, the high-efficiency water reducing agent is selected to further improve the fluidity of the prepared concrete, so that the pumping performance of the concrete in the subsequent working process is ensured.

In a second aspect, the present application provides a method for preparing LC lightweight concrete, which adopts the following technical scheme:

a preparation method of LC all-light concrete comprises the following steps:

s1: putting cement, mineral admixture, ceramsite, water and polycarboxylic acid water reducing agent into a concrete mixer for stirring to obtain a primary mixed material;

s2: and (4) putting the fine sand into the primary mixed material obtained in the step S1, and stirring to obtain the LC lightweight concrete.

Further setting the following steps: step S1 includes the following steps:

s 1: the cement, the mineral admixture and the shale ceramsite are dry-mixed in a concrete mixer and uniformly stirred to obtain a primary mixed dry material;

s 2: and (4) adding 80% of the required water into the primary mixed dry material obtained in the step s1, uniformly stirring, adding the water reducing agent and the rest 20% of water without stopping the concrete mixer after stirring, continuously stirring after adding, and uniformly stirring to form the primary mixed material.

By adopting the technical scheme and combining performance detection data, the LC lightweight concrete prepared by the step has better compressive strength. The result is that the lightweight soil ceramsite, the mineral admixture and the cement are firstly stirred, so that the cementing material is fully attached to the lightweight soil ceramsite, and then different particles can be bonded by means of the lightweight soil ceramsite after the lightweight soil ceramsite is subsequently added, so that the connection among the particles in the coarse aggregate is better formed, and finally, the concrete aggregate has stronger connection relation, and has higher compressive strength.

To sum up, the beneficial technical effect of this application does:

(1) the sodium monofluorophosphate is high in adhesion to stably adhere the cementing material and each particle, and meanwhile, the reinforcing fiber can further enhance the structure lightness, so that the LC lightweight concrete is finally formed and has stronger pressure resistance;

(2) the ceramsite is a macadam type shale ceramsite with more excellent strength and larger surface area, so that the bonding effect between the final coarse aggregates and the overall strength of the bonded concrete are further enhanced;

(3) the ceramsite, the sodium monofluorophosphate, the cementing material and the like are stirred first, so that the ceramsite is fully bonded with the cementing material, the bonding relation between the subsequent aggregates after contact is further enhanced, and the compression resistance of the concrete is finally improved.

Detailed Description

Example 1

The LC lightweight concrete disclosed in this embodiment includes ceramsite, fine sand, cement, water reducer, mineral admixture, water, reinforcing fiber, and sodium monofluorophosphate, where the mineral admixture includes fly ash, mineral powder, and silica fume, the ceramsite is a continuous graded crushed stone type shale ceramsite, the water reducer is a water reducer with a solid content of 20% and a water reduction rate of 35%, and the reinforcing fiber is polypropylene fiber. The specific weight values of the components are detailed in table 1.

Meanwhile, the embodiment also discloses a preparation method of the LC all-light concrete, which comprises the following steps:

s1: putting cement, mineral admixture, ceramsite, water reducer and sodium monofluorophosphate into a concrete mixer for stirring to obtain a primary mixed material;

s2: and (3) putting the fine sand and the reinforcing fiber into the primary mixed material obtained in the step S1, and stirring to obtain the LC lightweight concrete.

Wherein, the process of S1 includes the following steps:

s 1: the cement, the mineral admixture and the ceramsite are dry-mixed in a concrete mixer and uniformly stirred to obtain a primary mixed dry material;

s 2: and (4) adding 80% of the required water into the primary mixed dry material obtained in s1, uniformly stirring, adding the water reducing agent, the sodium monofluorophosphate and the residual 20% of water without stopping the concrete mixer after stirring, continuously stirring after adding, and uniformly stirring to form the primary mixed material.

Examples 2 to 6

The difference from example 1 is that the weight parts of each component are different, and the detailed numerical values are shown in Table 1.

Example 7

The difference from example 3 is that the shale ceramisite used in this example is a conventional shale ceramisite that is not a crushed stone type shale ceramisite.

Example 8

The difference from example 3 is that the shale ceramisite used in this example is prepared by using a discontinuous gradation.

Comparative examples 1 to 2

The difference from example 3 is that the weight parts of each component are different, and the detailed numerical values are shown in Table 1.

Comparative example 3

The difference from the embodiment 3 is that the preparation method of the LC lightweight concrete in the embodiment includes the following steps:

s1, putting cement, mineral admixture, ceramsite, fine sand, polypropylene fiber and sodium monofluorophosphate into a concrete mixer together for dry mixing, and uniformly mixing to obtain a mixed material;

and S2, adding a water reducing agent and required water into the mixture obtained in the S1, not stopping the concrete mixer in the water adding process, and uniformly mixing to obtain the LC all-light concrete.

Table 1: LC full light concrete each component weight part number indication table

NO.	Ceramic particle	Fine sand	Cement	Mineral powder	Fly ash	Silica fume	Water reducing agent	Polypropylene fiber	Sodium monofluorophosphate	Water (W)
											Example 1	1158	602	314	110	83	41	8.5	9	2.8	135
Example 2	1093	655	325	114	86	43	9.14	9.6	2.9	143
											Example 3	1041	697	336	118	88	47	9.42	10.1	3	147
Example 4	993	716	345	121	91	49	9.69	10.8	3.1	151
											Example 5	950	734	354	124	93	52	9.93	11.4	3.2	155
Example 6	901	778	361	127	95	55	10.2	12	3.3	165
											Comparative example 1	1041	697	336	118	88	47	9.42	0	3	147
Comparative example 2	1041	697	336	118	88	47	9.42	10.1	0	147

Performance detection test:

the concrete samples obtained in the examples and comparative examples were subjected to a compressive strength test, wherein the concrete samples were cubes of 15cm × 15cm × 15cm, three in each set, and cured by a standard method (temperature 20 ℃ ± 2 ℃, relative humidity 95% RH or more) after molding. The resulting performance results are shown in table 2.

Table 2: performance test result schematic table

And (4) analyzing results:

it can be seen by combining the performance test data of example 3 and comparative example 1 that the final compressive strength of the LC lightweight concrete can be effectively improved by adding the polypropylene fiber when the LC lightweight concrete is manufactured, and meanwhile, by combining the performance test data of example 3 and comparative example 2, the final compressive strength of the LC lightweight concrete can be effectively improved by adding the sodium monofluorophosphate when the LC lightweight concrete is manufactured, because the sodium monofluorophosphate can form a fluorine-containing mineralization system with mineral salts such as calcium, phosphorus and the like in the concrete, in the process, fluorine ions can replace hydroxyl in the mineral salts to form fluorine-containing mineral salts, and the acid corrosion resistance of the solidified concrete is enhanced. In addition, the aqueous solution of sodium monofluorophosphate has obvious effects of sterilizing and inhibiting the growth of microorganisms, thereby being beneficial to preventing fungi from growing on the concrete to cause loosening and stripping of the concrete and further being beneficial to improving the stability of the concrete.

By combining the performance test data of the embodiments 3 and 7, it can be seen that the compressive strength of the finally prepared concrete can be effectively improved when the adopted ceramsite is the crushed stone type shale ceramsite under the condition that other components and the preparation method are not changed. The result is that the single particle of the crushed stone type shale ceramsite has larger surface area and water absorption capacity than the conventional ceramsite, and the pores on the ceramsite are mostly of a triangular structure, so that the ceramsite particles have higher strength, and finally, the concrete obtained after the crushed stone type shale ceramsite is bonded with other ceramsite by combining a cementing material has larger compressive strength.

The performance test data of the embodiment 3 and the embodiment 8 are combined, so that the compression strength of the finally prepared LC lightweight concrete can be effectively improved when the adopted ceramsite is continuously graded under the condition that the components and the preparation method are not changed. The result is that the gaps among the continuously graded aggregate particles are smaller than those among the discontinuously graded aggregate particles, and finally the prepared concrete aggregate particles are relatively tighter, so that the concrete aggregate particles have better connection strength and better compression and load bearing capacity.

The LC lightweight concrete prepared by the procedure of example 3 had better compressive strength while keeping the components unchanged. Compared with the conventional preparation method of stirring all the materials in the comparative example 3, in the example 3, the ceramsite, the mineral admixture, the sodium monofluorophosphate and the cement are firstly stirred, so that the cementing material is fully attached to the light-weight ceramsite, and then different particles can be bonded by means of the ceramsite and the sodium monofluorophosphate after the fine sand and the reinforcing fiber are subsequently added, so that the connection among the particles in the concrete is better formed, and finally, the prepared concrete aggregate has stronger connection relation, and has higher structural strength.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.