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High performance concrete pumping agent controlling falling degree loss type

A high-performance concrete and slump loss technology, applied in the field of building materials, can solve problems such as unsatisfactory, uncontrollable concrete slump loss, and aggravated concrete slump loss, and achieve promising results in the market.

Inactive Publication Date: 2005-01-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the effect of composite wood calcium / sugar calcium on the control of concrete slump loss is not ideal and unstable, that is, sometimes it can have a certain effect, but sometimes it encounters cement containing anhydrite or industrial by-product gypsum. Not only can't control the loss of concrete slump, but it will aggravate the loss of concrete slump, and even condense in a short time, leading to serious engineering accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, control slump loss type high-performance concrete pumping agent by naphthalenesulfonic acid formaldehyde condensation product water reducer 33.2% (percentage by weight, hereinafter the same), polyvinyl alcohol 0.100%, 12 alkyl sodium sulfate 0.664%, It is formulated with 3.98% citric acid, 1.99% sodium gluconate, and 60.066% water. Compared with the reference concrete (concrete with the same mix ratio without the pumping agent), the high-performance pump is added with 3.8% of the cement mass Adding agent can increase the concrete slump from 10cm to 23cm, and there is still a water-reducing rate of 6%. The bleeding rate of this concrete is 0%, and the air content is 1.6%. After 2 hours, the slump There is no loss, the slump is still above 20cm after 4 hours, the slump loss rate is less than 15%, the 28d compressive strength of concrete is increased by 18%, and the impermeability grade is improved to a certain extent.

Embodiment 2

[0028] Example 2, the slump loss-controlled high-performance concrete pumping agent consists of 30.0% naphthalenesulfonic acid formaldehyde condensation product water reducer, 0.091% polyvinyl alcohol, 0.909% 12 alkyl sodium sulfate, 6.00% citric acid, gluconic acid It is formulated with 3.00% sodium and 60.0% water. Compared with the reference concrete (concrete with the same mix ratio without adding the pumping agent), adding this high-performance pumping agent accounting for 2.0% of the cement mass can make the concrete slump On the basis of the slump increasing from 10cm to 23cm, there is still a 5% water-reducing rate. The bleeding rate of this concrete is 0%, and the air content is 2.8%. There is no loss in slump after 2 hours, and it collapses after 4 hours. The slump is still above 20cm, the slump loss rate is less than 15%, the 28d compressive strength of concrete is increased by 12%, the impermeability level is improved to a certain extent, and the freeze-thaw cycle r...

Embodiment 3

[0029] Embodiment 3, control slump loss type high-performance concrete pumping agent according to 18.0% of naphthalenesulfonic acid formaldehyde condensation product water reducing agent, polyvinyl alcohol 0.09%, 12 alkyl sodium sulfate 1.02%, citric acid 4.5%, gluconic acid It is formulated with 4.5% sodium and 71.89% water. Compared with the reference concrete (concrete with the same mix ratio without adding the pumping agent), adding this high-performance pumping agent accounting for 4.5% of the cement mass can make the concrete slump On the basis of the slump increasing from 10cm to 23cm, there is still a 5% water-reducing rate. The bleeding rate of this concrete is 0%, and the air content is 1.8%. There is no loss in slump after 2 hours, and it collapses after 4 hours. The slump is still more than 20cm, the slump loss rate is less than 15%, the 28d compressive strength of concrete is increased by 10%, the impermeability level is improved to a certain extent, and the freeze...

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Abstract

The invention relates to a high-performance concrete pumping agent of controlling loss of concrete slump, composed of benzene solfonic acid formaldehyde condensation compound water reducer, polyvinyl alcohol, sodium lauryl sulfate, citric acid, sodium gluconate and water. It can improve the fluidity of concrete by a large margin, make the concrete slump constant basically in 2-4 hours, reduce seepage water, enhance strength and improve the durability of concrete. It is applied to the constructions (structures) of premixed concrete commodity, high-strength high-performance concrete, reinforced concrete, etc.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-performance concrete pumping agent for controlling slump loss. Background technique [0002] Commercial ready-mixed concrete adopts specialized production technology and centralized mixing supply process, which not only speeds up the concrete construction speed, but also greatly increases the mixing ratio of admixtures and various active mineral admixtures in concrete, effectively utilizing solid waste, saving This has laid a solid foundation for saving energy, saving resources and protecting the environment, and realizing the sustainable development of concrete, a bulk building material. [0003] The ready-mixed concrete is poured by pumping technology at the construction site, which requires the concrete to have good fluidity and pumpability. In addition, since the mixing station is a certain distance from the construction site, commercial ready-mi...

Claims

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Application Information

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IPC IPC(8): C04B24/10C04B24/22C04B24/26C04B24/30
Inventor 孙振平蒋正武张冠伦
Owner TONGJI UNIV
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