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Non-chlorine type high perpormance conrete accelerating agent

A technology of high-performance concrete and accelerator, applied in the field of building materials

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

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Problems solved by technology

At present, there are no reports on this aspect at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, chlorine-free high-performance concrete quick-setting agent is formulated by naphthalenesulfonic acid formaldehyde condensate superplasticizer 8.00% (weight percentage, the same below), calcium formate 7.20%, sodium fluoride 24.80%, water 60.00% to make. Adding 4.5% of the quick-setting agent in the weight of cement can make the initial setting time of the cement paste with a water-cement ratio of 0.4 be 4 minutes, and the final setting time is 8 minutes, and the compressive strength of 1:2.5 cement mortar can reach 18MPa, the 28-day compressive strength ratio exceeds 82%.

Embodiment 2

[0022] Example 2, the chlorine-free high-performance concrete quick-setting agent is prepared by 9.41% of naphthalenesulfonic acid formaldehyde condensate superplasticizer, 12.22986% of calcium formate, 18.34% of sodium fluoride, 0.00014% of cellulose, and 60.02% of water. Adding 4.0% of the quick-setting agent in the weight of cement can make the initial setting time of cement slurry with a water-cement ratio of 0.4 be 3 minutes, and the final setting time is 6 minutes, and the compressive strength of 1:2.5 cement mortar can reach 16MPa, the 28-day compressive strength ratio exceeds 80%.

Embodiment 3

[0023] Example 3, the chlorine-free high-performance concrete quick-setting agent is formulated with 6.00% naphthalenesulfonic acid formaldehyde condensate superplasticizer, 1.2% calcium formate, 22.8% sodium fluoride, 0.0048% cellulose, and 69.9952% water. Adding the quick-setting agent accounting for 6.0% of the cement weight can make the initial setting time of the cement slurry with a water-cement ratio of 0.4 be 5 minutes, and the final setting time is 8 minutes, and the compressive strength of the 1:2.5 cement mortar can reach 15MPa, the 28-day compressive strength ratio exceeds 80%.

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Abstract

The invention relates to a chlorine-free high-performance concrete setting accelerator, composed of high-efficacy benzene solfonic acid formaldehyde condensation compound water reducer, sodium formate, sodium fluoride, fibrin and water. It can shorten the setting time of grout and concrete, and the initial setting time is in 5 min and the final setting time is in 10 min, and after setting, the strength of the grout rapidly develops. It can effectively avoid the corrosion damage of Cl- ions to the reinforcement in the concrete. It is applied to the shotcrete in tunnel, culvert and shoring engineering, and also the engineering of concrete emergency salvaging, anchoring, and water stopping and leakage stopping.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a chlorine-free high-performance concrete quick-setting agent. Background technique [0002] Adding a certain amount of admixtures in concrete can improve the performance of concrete materials as required, so that the prepared concrete can adapt to new construction techniques and meet various construction requirements. Adding a certain amount of quick-setting agent in the concrete can make the prepared concrete set and harden in a very short time after adding water and mixing, and build up the strength as soon as possible. Concrete mixed with accelerator is very fast in setting and hardening, so it is suitable for spraying construction technology and rapid repair and water and leak plugging projects. Due to the fast setting speed of concrete mixed with accelerator, the strength development is also very rapid, which will inevitably cause certain defects in its microstr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/12C04B24/04C04B24/22C04B24/38
Inventor 孙振平蒋正武张冠伦王玉吉
Owner TONGJI UNIV
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