Self-compacting fiber toughened lightweight aggregate concrete and preparation method thereof

A light aggregate concrete and fiber toughening technology, applied in the field of concrete materials, can solve the problems of light aggregate concrete prone to brittle failure, floating, vibration segregation, etc., and achieve good durability, good volume stability, and crack resistance The effect of excellent performance

Inactive Publication Date: 2019-05-21
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies, provide a self-compacting fiber toughened lightweight aggregate concrete and its preparation method, solve the shortcoming that the lightweight aggregate concrete is prone to brittle failure, and avoid the floating of the lightweight aggregate in the lightweight aggregate concrete , vibration, segregation, etc.

Method used

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  • Self-compacting fiber toughened lightweight aggregate concrete and preparation method thereof
  • Self-compacting fiber toughened lightweight aggregate concrete and preparation method thereof
  • Self-compacting fiber toughened lightweight aggregate concrete and preparation method thereof

Examples

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preparation example Construction

[0026] see figure 1 , the preparation method of the present invention comprises the following steps:

[0027] Step 1: Mix 100 parts of cement, 200 parts of sand, 45 parts of fly ash, and 6 parts of silica fume according to the parts by mass, then add 9 to 12 parts of steel fiber and 0 to 0.3 part of polypropylene fiber, and stir evenly to obtain mixture A;

[0028] Step 2: Mix 45 parts of water with 1 to 1.7 parts of water reducer, and stir evenly to obtain a mixture B of water reducer and water;

[0029] Step 3: Add 70% water reducer and water mixture B to mixture A, and stir to obtain mixture C;

[0030] Step 4, add 120 parts of coarse aggregate to the mixture C, stir evenly to obtain the mixture D;

[0031] Step 5: Add the remaining 30% water reducer and water mixture B into the mixture D, and stir evenly to obtain self-compacting fiber-toughened lightweight aggregate concrete.

[0032] The cement adopts P·O42.5 Portland cement.

[0033] The fly ash is Class I fly ash....

Embodiment 1

[0040] This embodiment provides a kind of self-compacting fiber toughened lightweight aggregate concrete, which is composed of cementitious material, river sand, lightweight aggregate, admixture and water. The dosage of each material in each cubic concrete is as follows: 170kg of water, 374kg of cement, Fly ash 170, silica fume 22.7kg, coarse aggregate 447kg, sand 760kg, water reducing agent 5.1kg, steel fiber 39kg.

[0041] see figure 1 , the preparation method of above-mentioned self-compacting fiber toughened lightweight aggregate concrete, comprises the steps:

[0042] 1) Preparation: Use a forced mixer for mixing, and use a concrete vibrating table for vibration. Before mixing concrete, add water and run it idle for a few minutes, then drain the remaining water to ensure that the wall of the mixing tank is completely wet.

[0043] 2) Dry mixing: Put the mineral admixture, fine aggregate and cement into the mixer, then add an appropriate amount of fiber material, followe...

Embodiment 2

[0048] This embodiment provides a kind of self-compacting fiber toughened lightweight aggregate concrete, which is composed of cementitious material, river sand, lightweight aggregate, admixture and water. The dosage of each material in each cubic concrete is as follows: 170kg of water, 374kg of cement, Fly ash 170, silica fume 22.7kg, coarse aggregate 447kg, sand 760kg, water reducing agent 5.3kg, steel fiber 39kg, polypropylene fiber 0.455kg.

[0049] The preparation method of the above self-compacting fiber toughened lightweight aggregate concrete is the same as that of Example 1.

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Abstract

The invention discloses self-compacting fiber toughened lightweight aggregate concrete and a preparation method thereof. The concrete consists of water, cement, fly ash, silica fume, coarse aggregate,sand, a water reducing agent, steel fibers and polypropylene fibers, has the advantages of being lightweight, high in strength and durability, excellent in crack resistance, great in fluidity and volume stability, capable of achieving automatic compacting and the like, overcomes the defect that the lightweight aggregate concrete is likely to cause brittle failure, and meanwhile can flow compactlyduring pouring; additional vibration is not needed, and the problems of light aggregate floating, vibration segregation and the like in lightweight aggregate concrete are avoided. The self-compactingfiber toughened lightweight aggregate concrete can be widely applied to large-size, super-high-rise and large-span building structures.

Description

technical field [0001] The invention belongs to the field of concrete materials, and in particular relates to a self-compacting fiber toughened lightweight aggregate concrete and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of building technology, the building structure is developing towards large volume, super high-rise, and long-span, which puts forward higher requirements on the performance of building materials and construction technology. Ordinary concrete with high self-weight restricts the development of high-rise and long-span building structures, and its shortcomings are becoming increasingly apparent. Lightweight aggregate concrete has the advantages of light weight, excellent durability, and good economy, and has a good application prospect. However, the currently used lightweight aggregate concrete has disadvantages such as low strength and easy brittle failure. At the same time, due to the low density ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20C04B111/40
Inventor 吴涛魏慧刘喜杨雪王立勋孙艺嘉
Owner CHANGAN UNIV
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