Light high-strength crack-resistance auxiliary material and method for improving crack resistance and heat preservation performance of concrete

A light-weight, auxiliary material technology, applied in the field of anti-cracking auxiliary materials, improving concrete crack resistance and thermal insulation performance, can solve problems such as high-priced repairs, fire, poor concrete uniformity, etc., to achieve the effect of improving crack resistance and improving uniformity

Active Publication Date: 2016-07-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the uniformity of the concrete becomes very poor, the mortar on the surface layer is very easy to crack, and cracks from the surface to the inside often appear
In the case of environmental changes such as temperature and humidity and irregular construction control and maintenance, some cracks are very serious and must be repaired at a high price, otherwise the use function and long-term durability of the structure will be seriously affected
[0003] On the other hand, with the improvement of national energy-saving building requirements, the concrete floor, ground and roof must be laid with insulation layer, and the cost per m 2 As high as 40-60 yuan, and organic foam plastic boards are often used, and there is a danger of fire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) The mixing ratio of pumped concrete: cement 370kg, fly ash 93kg, sand 701kg, stone 1051kg, PCA water reducing agent 4.63kg, water 185kg;

[0030] 2) Spread 10% of the anti-cracking auxiliary material of the pumped concrete volume evenly on the surface of the concrete. The composition and mass percentage of each component of the anti-cracking auxiliary material are: 100% lightweight high-strength ceramsite

[0031] 3) Use a flat vibrator to perform secondary vibrating, so that the anti-cracking auxiliary materials slowly sink and evenly distribute in the mortar on the concrete surface.

[0032] The high crack resistance pumping concrete was prepared according to the aforementioned process, and the crack reduction coefficient of its crack resistance was measured to be 86%. Example 2:

Embodiment 2

[0033] 1) The mixing ratio of pumped concrete: cement 370kg, fly ash 93kg, sand 701kg, stone 1051kg, PCA water reducing agent 4.63kg, water 185kg;

[0034] 2) Evenly spread 10% of the anti-cracking auxiliary material of the pumped concrete volume on the surface of the concrete. The composition and mass percentage of each component of the anti-cracking auxiliary material are:

[0035] Lightweight high-strength ceramsite 99.5%

[0036] Interface agent 0.5%

[0037] 3) Use a flat vibrator to perform secondary vibrating, so that the anti-cracking auxiliary materials slowly sink and evenly distribute in the mortar on the concrete surface.

[0038] The high crack resistance pumping concrete is prepared according to the foregoing process, and the crack reduction coefficient of the crack resistance is measured to be 90%.

Embodiment 3

[0040] 1) The mixing ratio of pumped concrete: cement 370kg, fly ash 93kg, sand 701kg, stone 1051kg, PCA water reducing agent 4.63kg, water 185kg;

[0041] 2) Evenly spread 10% of the anti-cracking auxiliary material of the pumped concrete volume on the surface of the concrete. The composition and mass percentage of each component of the anti-cracking auxiliary material are:

[0042] Lightweight high-strength ceramsite 97.5%

[0043] Interface agent 2.5%

[0044] 3) Use a flat vibrator to perform secondary vibrating, so that the anti-cracking auxiliary materials slowly sink and evenly distribute in the mortar on the concrete surface.

[0045] The high crack-resistant pumping concrete was prepared according to the foregoing process, and the crack reduction coefficient of its crack resistance was measured to be 97%.

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Abstract

The invention discloses a light high-strength crack-resistance auxiliary material and a method for improving the crack resistance and heat preservation performance of concrete.The light high-strength crack-resistance auxiliary material is prepared from light high-strength spherical burn-free ceramisite and a special interface agent.According to the adopted ceramisite, the particle size ranges from 8 mm to 15 mm, the loose bulk density ranges from 800 kg/m3 to 1000 kg/m<3>, the cylinder compressive strength ranges from 4 MPa to 6.5 MPa, and the water absorption ranges from 15% to 25%.An organic additive serves as the interface agent, bonding strength of the burn-free ceramisite and a mortar interface can be remarkably improved, and moisture in the burn-free ceramisite and the mortar interface can be slowly released.The using quantity of the crack-resistance auxiliary material is 10-25% of the volume of pumped concrete, the structural crack resistance and heat preservation performance of concrete are remarkably improved, and self-curing is achieved.The light high-strength crack-resistance auxiliary material can be applied to the cast-in-situ concrete pumping construction process of floors, the ground and roofs of buildings.

Description

Technical field [0001] The invention belongs to the field of civil engineering materials, and relates to an anti-cracking auxiliary material made of light-weight high-strength ceramsite and a method for improving the anti-cracking and thermal insulation properties of concrete. Background technique [0002] As we all know, the floor, ground and roof of buildings are characterized by large area, but the thickness is only 100-150mm, which belongs to large area concrete. The pumped concrete used for this kind of structure generally has a strength grade of C30~C40, the actual slump is 180±30mm, the fluidity is large, the sand content is high, the amount of stones is small, the concrete workability is not good, after vibrating A mortar layer of 20-30mm often appears on the surface, accompanied by bleeding. As a result, the uniformity of the concrete becomes very poor, the mortar on the surface is very easy to crack, and there are often cracks from the surface to the inside. In the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B20/00C04B28/00C04B111/20
CPCC04B20/1029C04B28/00C04B2111/2038C04B20/004C04B18/08C04B14/02C04B2103/302
Inventor 秦鸿根庞超明熊羽
Owner SOUTHEAST UNIV
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