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Chlorine-free type high-strength high-performance sprayed concrete accelerator

A sprayed concrete, high-performance technology, applied in the field of building materials, can solve the problems of uneven addition of powder accelerator and large dust

Active Publication Date: 2010-12-08
浙江五龙新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the accelerators sold in the market are powder accelerators, and the problems of uneven addition of powder accelerators and large dust are common in construction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] High-strength and high-performance chlorine-free liquid quick-setting agent is based on sodium aluminate 10.0% (weight percentage, the same below), potassium hydroxide 7.0%, potassium carbonate 12.0%, triethanolamine 2.5%, hydroxypropyl methylcellulose 0.001%, water 68.499% formulated. Adding 6.5% of the quick-setting agent by weight of cement can make the initial setting time of the cement paste with a water-cement ratio of 0.4 be 3 minutes and the final setting time be 7 minutes, and the compressive strength of 1:2.5 cement mortar can reach 16.5MPa, the 28-day compressive strength ratio exceeds 80%.

example 2

[0027] The high-strength and high-performance chlorine-free liquid quick-setting agent is composed of 10.0% sodium aluminate (percentage by weight, the same below), 5.0% sodium hydroxide, 8.0% potassium carbonate, 4.0% triethanolamine, 0.002% hydroxypropyl methylcellulose, water 72.998% formulated. Adding 7.5% of the cement weight of the quick-setting agent can make the cement slurry with a water-cement ratio of 0.4 have an initial setting time of 2 minutes and a final setting time of 5 minutes, and the compressive strength of 1:2.5 cement mortar can reach 15.3MPa, the 28-day compressive strength ratio exceeds 80%.

example 3

[0029] High-strength and high-performance chlorine-free liquid quick-setting agent is based on sodium aluminate 10.0% (weight percentage, the same below), sodium hydroxide 5.0%, potassium carbonate 5.0%, sodium carbonate 2.0%, triethanolamine 4.0%, hydroxypropyl methylcellulose Su 0.002%, water 73.998% formulated. Adding 7.0% of the quick-setting agent in cement weight can make the initial setting time of the 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 15.7MPa, the 28-day compressive strength ratio exceeds 80%.

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Abstract

The invention discloses a chlorine-free type high-strength high-performance sprayed concrete accelerator which comprises aluminate, carbonate, alkali metal hydroxide, alkanolamine, cellulose and water. Through the invention, the setting time of cement slurry and concrete can be greatly shortened, the cement slurry and the concrete are initially set within 5 minutes and finally set within 10 minutes, and the strength is rapidly improved after the slurry is set. The rusting harm of chlorine ions to reinforcing bars inside the concrete can be effectively avoided by using the invention.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a chlorine-free high-strength and high-performance shotcrete accelerator. Background technique [0002] Shotcrete is the use of spraying machinery, compressed air or other power to add accelerators to a certain proportion of concrete mixture, then transport it through pipelines and spray it on the rock surface, structures and buildings to be sprayed at high speed, and A type of concrete that hardens rapidly. It can effectively prevent tunnels or basements, slopes, and building foundation pits from collapsing and landslides, and play the role of temporary support or permanent support, and can also reinforce existing buildings and structures. Therefore, shotcrete must reach the initial and final setting within the required time and reach the specified strength. In order to meet the above requirements, accelerators must be added to the concrete. [0003] Accelerator is...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B24/38C04B103/12
CPCC04B2103/12C04B2111/00155C04B2111/26C04B2103/0008C04B2103/0006C04B2103/0007C04B2201/05C04B2111/1062C04B40/0039
Inventor 洪涛马军委刘臻一何勇宋永良
Owner 浙江五龙新材股份有限公司
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