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A kind of crack-resistant early-strength concrete and its preparation method

A technology of concrete and silica, which is applied in the field of building materials, can solve problems such as limiting early strength, easy cracking, and adverse effects on concrete later strength

Active Publication Date: 2021-07-30
宁波西立混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the particle size of nano-silica is too small, it is almost difficult to disperse evenly in the system, and it usually exists in the form of aggregates. On the one hand, its early strength is limited, and on the other hand, aggregates exist in concrete. , have an adverse effect on the later strength of concrete
In addition, due to the rapid strength growth rate of early-strength concrete, the concrete shrinkage is relatively large, and it is prone to cracking, which also restricts the popularization and use of early-strength concrete.

Method used

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  • A kind of crack-resistant early-strength concrete and its preparation method
  • A kind of crack-resistant early-strength concrete and its preparation method
  • A kind of crack-resistant early-strength concrete and its preparation method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] A crack-resistant early-strength concrete made of the following raw materials in parts by weight:

[0032] 460 parts of cement, 60 parts of mineral powder, 512 parts of sand, 1252 parts of gravel, 5 parts of cellulose-silica composite nanomaterials, 2 parts of calcium sulfate whiskers with an average length of 50 μm, early-strength polycarboxylate water-reducing 4.1 parts of agent, 175 parts of water.

[0033] Among them, the apparent density of sand is 2580kg / m 3 , the apparent density of gravel is 2600kg / m 3 .

[0034] The cellulose-silicon dioxide composite nanomaterial is made of the following raw materials in parts by weight: 4 parts of nanocellulose, 30 parts of tetraethyl orthosilicate, 30 parts of absolute ethanol, 80 parts of water, and an appropriate amount of ammonia water. The preparation method is as follows:

[0035] (1) adding nanocellulose into water, ultrasonically dispersing at 500W power for 10min, and then homogenizing under high pressure at 50MPa...

Embodiment 2

[0042] A crack-resistant early-strength concrete made of the following raw materials in parts by weight:

[0043] 469 parts of cement, 62 parts of mineral powder, 518 parts of sand, 1264 parts of gravel, 7 parts of cellulose-silica composite nanomaterials, 3 parts of calcium sulfate whiskers with an average length of 100 μm, early-strength polycarboxylate water-reducing 4.6 parts of agent, 178 parts of water.

[0044] Among them, the apparent density of sand is 2585kg / m 3 , the apparent density of gravel is 2680kg / m 3 .

[0045] The cellulose-silicon dioxide composite nanomaterial is made of the following raw materials in parts by weight: 4.5 parts of nanocellulose, 35 parts of tetraethyl orthosilicate, 35 parts of absolute ethanol, 90 parts of water, and an appropriate amount of ammonia water. The preparation method is as follows:

[0046] (1) Adding nanocellulose to water and ultrasonically dispersing for 6 minutes at a power of 800W, and then homogenizing under high pres...

Embodiment 3

[0053] A crack-resistant early-strength concrete made of the following raw materials in parts by weight:

[0054] 475 parts of cement, 65 parts of mineral powder, 527 parts of sand, 1288 parts of gravel, 10 parts of cellulose-silica composite nanomaterials, 5 parts of calcium sulfate whiskers with an average length of 200 μm, early-strength polycarboxylate water-reducing 4.9 parts of agent, 180 parts of water.

[0055] Among them, the apparent density of sand is 2590kg / m 3 , the apparent density of gravel is 2700kg / m 3 .

[0056] The cellulose-silicon dioxide composite nanomaterial is made of the following raw materials in parts by weight: 5 parts of nanocellulose, 40 parts of ethyl orthosilicate, 40 parts of absolute ethanol, 100 parts of water, and an appropriate amount of ammonia water. The preparation method is as follows:

[0057] (1) Add nanocellulose to water and ultrasonically disperse for 5 minutes under a power of 1000W, and then homogenize under high pressure for...

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Abstract

The invention discloses a crack-resistant early-strength concrete and a preparation method thereof. The concrete is made of the following raw materials in parts by weight: 460-475 parts of cement, 60-65 parts of mineral powder, 512-527 parts of sand, and 1252-parts of gravel 1288 parts, 5-10 parts of cellulose-silica composite nanomaterials, 2-5 parts of calcium sulfate whiskers, 4.1-4.9 parts of early-strength polycarboxylate superplasticizer, 175-180 parts of water. The concrete prepared by the invention not only has fast coagulation and hardening speed, high early strength and good early strength performance, but also has high later compressive strength, and is not easy to crack and crack, and has excellent working performance and durability.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a crack-resistant early-strength concrete and a preparation method thereof. Background technique [0002] With the rapid development of national economy and highway infrastructure construction, highway maintenance and management are becoming more and more important. In recent years, the vehicle load on the highway is getting bigger and bigger, the driving speed is getting faster and faster, and the road surface damage is becoming more and more serious. If ordinary concrete is used to repair the pavement, since ordinary concrete needs to be cured for a long time to reach a certain strength, if the newly repaired concrete pavement is put into use in a short period of time, it is easy to crack and break again, and it is difficult to adapt to the fast-paced use requirements of the road. Early-strength concrete refers to concrete with short setting time and high early stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2111/00008C04B2111/343C04B2201/50C04B18/12C04B14/06C04B24/383C04B14/383C04B24/24
Inventor 姚献义
Owner 宁波西立混凝土有限公司
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