High performance concrete pumping agent controlling falling degree loss type and its usage method

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

Inactive Publication Date: 2006-11-22
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 standard coagulation (concrete with the same mix ratio without adding the pumping agent), the addition of 3.8% of the cement mass Performance pumping agent, can increase the concrete slump from 10cm to 23cm, and still have a water reducing rate of 6%. The bleeding rate of this concrete is 0%, the air content is 1.6%, and it will collapse after 2 hours There is no loss in slump, the slump is still above 20cm after 4 hours, the slump loss rate is less than 15%, the 28d compressive strength of concrete increases by 18%, and the impermeability level improves 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 water reduction rate of 5%, which is beneficial. The bleeding rate on the coagulation is 0%, the air content is 2.8%, and there is no loss of slump after 2 hours. 4 Hours later, 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-th...

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 belongs to the technical field of building materials, and in particular relates to a high-performance concrete pumping agent for controlling slump loss. It is composed of naphthalenesulfonic acid formaldehyde condensation product water reducer, polyvinyl alcohol, sodium 12 alkyl sulfate, citric acid, sodium gluconate and water. Using this invention can greatly improve the fluidity of concrete, and make the concrete slump between 2- There is basically no loss within 4 hours, and it reduces bleeding, increases strength, and improves concrete durability. The invention is applicable to structures (structures) such as commercial ready-mixed concrete, mass concrete, reinforced concrete, light aggregate concrete, bridges, buildings, hydraulic engineering and road surfaces.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/22C04B24/26C04B24/30C04B24/10
Inventor 孙振平蒋正武张冠伦
Owner TONGJI UNIV
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