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High-density self-compacted concrete and preparation method

A self-compacting concrete, high-strength technology, applied in the field of building materials, can solve the problem of single admixture performance, achieve good resistance to tensile deformation, environmental protection, and improve strength and durability.

Active Publication Date: 2017-01-04
CHINA MCC17 GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the performance of concrete, various admixtures with different properties are added for adjustment. Currently, commonly used concrete admixtures can reduce water consumption, control setting time, and improve durability. However, the performance of admixtures is single and cannot meet the requirements. Therefore, it is necessary to optimize the formula through experiments to improve the performance of concrete and make the application prospect of concrete more broad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take the raw material according to the following parts by weight:

[0024] Cementitious material 23 (the mass percentage of cement in the cementitious material is 60%), aggregate 32, sand 27 (the ratio of medium sand to fine sand is 2:1), expanded vermiculite 5, water reducing agent 0.2, superplasticizer Thickener 0.1, thixotropic lubricant 0.3%, straw fiber 0.3, water 12.

[0025] After raw material preparation, its preparation method is as follows:

[0026] (1) Put the gelling material, straw fiber, and thickener required for the ingredients together and stir for 3 to 6 minutes, and then follow the water, water reducing agent, and thixotropic lubricant required for the ingredients Add it in turn, and continue to stir for 5 to 10 minutes to obtain a slurry mixture;

[0027] (2) Add aggregate, sand and expanded vermiculite to the slurry mixture obtained in step (1), and stir for 3 to 6 minutes to obtain self-compacting concrete with a 28-day compressive strength of 43...

Embodiment 2

[0029] Take the raw material according to the following parts by weight:

[0030] Cementitious material 25 (the mass percentage of cement in the cementitious material is 50%), aggregate 28, sand 30 (the ratio of medium sand to fine sand is 4:1), expanded vermiculite 6, water reducer 0.6, superplasticizer Thickener 0.1, thixotropic lubricant 0.1%, straw fiber 0.2, water 10.

[0031] After raw material preparation, its preparation method is as follows:

[0032] (1) Put the gelling material, straw fiber, and thickener required for the ingredients together and stir for 3 to 6 minutes, and then follow the water, water reducing agent, and thixotropic lubricant required for the ingredients Add it in turn, and continue to stir for 5 to 10 minutes to obtain a slurry mixture;

[0033] (2) Add aggregate, sand and expanded vermiculite to the slurry mixture obtained in step (1), and stir for 3 to 6 minutes to obtain self-compacting concrete with a 28-day compressive strength of 43 MPa an...

Embodiment 3

[0035] Take the raw material according to the following parts by weight:

[0036] Cementitious material 28 (the mass percentage of cement in the cementitious material is 55%), aggregate 30, sand 23 (the ratio of medium sand to fine sand is 3:1), expanded vermiculite 4, water reducer 0.5, superplasticizer Thickener 0.1, thixotropic lubricant 0.2%, straw fiber 0.2, water 14.

[0037] After raw material preparation, its preparation method is as follows:

[0038] (1) Put the gelling material, straw fiber, and thickener required for the ingredients together and stir for 3 to 6 minutes, and then follow the water, water reducing agent, and thixotropic lubricant required for the ingredients Add it in turn, and continue to stir for 5 to 10 minutes to obtain a slurry mixture;

[0039] (2) Add aggregate, sand and expanded vermiculite to the slurry mixture obtained in step (1), and stir for 3 to 6 minutes to obtain self-compacting concrete with a 28-day compressive strength of 46 MPa an...

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Abstract

The invention discloses high-density self-compacted concrete and a preparation method. The high-density self-compacted concrete consists of the following components in percentage by mass: 15-32% of a cementing material, 20-35% of aggregates, 20-42% of sand, 3-12% of expanded vermiculite, 0.1-0.8 percentage of a water reducing agent, 0.04-0.5% of a thickening agent, 0.2-1.5% of a thixotropy lubricant, 0.08-0.8% of straw fiber and 10-25% of water. The preparation method comprises the following steps: stirring the cementing material, the straw fiber and the thickening agent needed for preparation for 3-6 minutes, sequentially adding the water, the water reducing agent and the thixotropy lubricant needed for preparation, and continuously stirring the mixture for 5-10 minutes so as to obtain a slurry mixed material; B, adding the aggregates, the sand and the expanded vermiculite into the slurry mixed material obtained in the step A, and stirring the mixture for 3-6 minutes, thereby obtaining the high-density self-compacted concrete. By adopting the high-density self-compacted concrete, properties of concrete can be effectively improved, a mixture can be relatively good in flowability and caking properties, and the high-density self-compacted concrete has the characteristics of being relatively good in anti-separation properties, tensile resistance, anti-cracking properties, self-filling properties, gap through properties, size stability and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-strength self-compacting concrete and a preparation method thereof. Background technique [0002] At present, in the concrete construction process, the cast-in-place concrete is usually pumped and compacted by vibrating with a hand-held vibrating rod. However, in the face of large-volume and long-span components, it is impossible to ensure uniform feeding and compact vibration. Therefore, it is necessary to use a It is more suitable for high-performance self-compacting concrete to meet the needs. [0003] Self-compacting concrete has high requirements on workability and durability, and also has strict requirements on raw materials and mix ratio. The mix ratio design of self-compacting concrete needs to fully consider the fluidity, segregation resistance, self-filling and slurry properties of self-compacting concrete. The interrelationship and contra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/28
CPCC04B28/04C04B2111/28C04B2201/50C04B18/142C04B18/167C04B14/06C04B14/204C04B24/18C04B24/22C04B24/383C04B18/24C04B2103/0068C04B18/141
Inventor 钱元弟柯能好雷团结王孝平杨德富李瑞来李亚辉王慧
Owner CHINA MCC17 GRP
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