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Alkali-free fast coagulating agent

A technology of coagulant and quick-setting agent, applied in the field of building materials, can solve the problems of large dosage and narrow adaptability of cement, and achieve the effects of low comprehensive cost, remarkable quick-setting effect and low rebound rate

Inactive Publication Date: 2017-11-03
如皋市福通纺织化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent [CN1974466] dissolves aluminum sulfate, magnesium sulfate, alcohol amine, stabilizer, defoamer and glycerin in water to prepare an alkali-free quick-setting agent suitable for medium-heat cement with lower tricalcium aluminate content, but it is not suitable for The scope of application of cement is narrow, and the dosage is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The non-alkali liquid quick-setting agent of the present invention is applied in shotcrete supporting a certain railway passenger tunnel, and the design concrete strength grade is C20.

[0021] Weigh 349.9g of water, 300g of aluminum sulfate, and 200g of aluminum citrate into a reactor, heat to 70°C, and stir for 30 to 60 minutes to fully dissolve them.

[0022] Weigh 0.1g of polyacrylamide into the reactor, and stir at 70°C for 60-120 minutes, with a stirring rate not lower than 200 rpm.

[0023] Weigh 100 g of 20% ammonia water into the reactor, heat and stir at 70° C. for 60 to 120 minutes, and the stirring speed is not lower than 200 rpm.

[0024] Weigh 50g of hydroxycarboxylic acid into the reactor, cool down to 60°C, continue to stir for 30-60 minutes, and then cool to 50°C to form the quick-setting agent with a pH value of 5.0.

[0025] The amount of non-alkali liquid quick-setting agent is 8%; P·O42.5 cement 420kg; fineness modulus 2.5 medium sand 960kg; 5-10mm...

Embodiment 2

[0028] The non-alkali liquid quick-setting agent of the present invention is applied in shotcrete supporting a certain railway passenger tunnel, and the design concrete strength grade is C20.

[0029] Weigh 349.9g of water, 400g of aluminum sulfate, and 100g of aluminum citrate into a reactor, heat to 70°C, and stir for 30 to 60 minutes to fully dissolve them.

[0030] Weigh 0.1g of polyacrylamide into the reactor, and stir at 70°C for 60-120 minutes, with a stirring rate not lower than 200 rpm.

[0031] Weigh 50 g of 20% ammonia water into the reactor, heat and stir at 70° C. for 60 to 120 minutes, and the stirring speed is not lower than 200 rpm.

[0032] Weigh 100g of hydroxycarboxylic acid into the reactor, cool down to 60°C, continue to stir for 30-60 minutes, and then cool to 50°C to form the quick-setting agent with a pH value of 4.6.

[0033] The amount of non-alkali liquid quick-setting agent is 8%; P·O42.5 cement 420kg; fineness modulus 2.5 medium sand 960kg; 5-10mm...

Embodiment 3

[0036] The non-alkali liquid quick-setting agent of the present invention is applied in shotcrete supporting a certain railway passenger tunnel, and the design concrete strength grade is C20.

[0037] Weigh 329.9g of water, 500g of aluminum sulfate, and 100g of aluminum citrate into a reactor, heat to 70°C, and stir for 30 to 60 minutes to fully dissolve them.

[0038] Weigh 0.5g of polyacrylamide into the reactor, and stir at 70°C for 60-120 minutes with a stirring rate not lower than 200 rpm.

[0039] Weigh 50 g of 20% ammonia water into the reactor, heat and stir at 70° C. for 60 to 120 minutes, and the stirring speed is not lower than 200 rpm.

[0040] Weigh 20g of hydroxycarboxylic acid into the reactor, cool down to 60°C, continue to stir for 30-60 minutes, and then cool to 50°C to form the quick-setting agent with a pH value of 5.1.

[0041] The amount of non-alkali liquid quick-setting agent is 8%; P·O42.5 cement 420kg; fineness modulus 2.5 medium sand 960kg; 5-10mm c...

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Abstract

The invention discloses an alkali-free quick-setting agent. The composition and proportion of the quick-setting agent are: 30-50% of aluminum sulfate, 10-20% of aluminum citrate, 2-10% of hydroxycarboxylic acid, 20% The concentration of ammonia water is 5-10%, polyacrylamide is 0.01-0.05%, and the rest is water. The production process is that the above raw materials are put into the reaction kettle according to different feeding orders, heated at 60-80°C, stirred evenly, and form a colorless or light green viscous liquid after cooling. The advantage of the present invention is that the introduction of multi-hydroxyl functional group molecules promotes the coordination crosslinking of the aluminum crosslinking system and polyacrylamide molecules, and prepares a high-activity composite aluminum citrate crosslinking system, which significantly improves the cement's strength. Hydration rate, thus enhancing the effect of accelerator. The setting time of the cement mortar mixed with this accelerator is greatly shortened, the initial setting is less than 2 minutes, the final setting is less than 6 minutes, and the 1d compressive strength exceeds 10MPa, and the 28d compressive strength ratio is greater than 140%.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an alkali-free fast setting agent. technical background [0002] With the rapid development of high-speed railways, railway passenger trains, urban subways and the widespread promotion of wet spray technology, powder accelerators and alkaline liquid accelerators can no longer meet the construction technical requirements. [0003] The existing patent [CN102249592A] utilizes aluminum sulfate, alkaline earth metal salts, aluminum hydroxide, hydroxycarboxylic acid, organic amine compounds and stabilizers to synthesize a non-alkali and chlorine-free high-early-strength liquid quick-setting agent, but its late-stage strength of concrete is retained The value is low. Patent [CN1974466] dissolves aluminum sulfate, magnesium sulfate, alcohol amine, stabilizer, defoamer and glycerin in water to prepare an alkali-free quick-setting agent suitable for medium-heat ceme...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B28/04C04B103/12
CPCC04B40/0039C04B28/04C04B2103/12C04B2201/05C04B2201/50
Inventor 李蓉妹
Owner 如皋市福通纺织化学品有限公司
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