Preparation method of novel alkali-free liquid accelerator

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

Active Publication Date: 2013-11-20
BEIJING ACAD OF BUILDING ENG
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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 the reactor, heat to 70°C, and stir for 30-60 minutes to fully dissolve;

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

[0023] Weigh 100g of 20% ammonia water into the reactor, heat and stir at 70°C for 60-120 minutes, and the stirring rate 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 crushed ston...

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;

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

[0031] Weigh 50g of 20% ammonia water into the reactor, heat and stir at 70°C for 60-120 minutes, and the stirring rate 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 crushed sto...

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 the reactor, heat to 70°C, and stir for 30-60 minutes to fully dissolve;

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

[0039] Weigh 50g of 20% ammonia water into the reactor, heat and stir at 70°C for 60-120 minutes, and the stirring rate 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 crushed stone...

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Abstract

The invention discloses a preparation method of a novel alkali-free liquid accelerator. The ingredients and the proportion of the accelerator are as follows: 30-50% of aluminum sulfate, 10-20% of aluminum citrate, 2-10% of hydroxycarboxylic acid, 5-10% of ammonium hydroxide at the concentration of 20%, 0.01-0.05% of polyacrylamide and the balance of water. The preparation method comprises the following technological production steps: feeding the raw materials into a reaction kettle according to different feeding sequences, heating and uniformly mixing the raw materials at 60-80 DEG C, and cooling the mixture to obtain a colorless or light green thick liquid. The preparation method disclosed by the invention has the following advantages that due to the introduction of multi-hydroxyl functional group molecules, the coordination crosslinking of an aluminum crosslinking system and polyacrylamide molecules is promoted, a composite aluminum citrate crosslinking system with high activity is prepared, the hydration rate of cement is obviously increased, and furthermore the action effect of the accelerator is enhanced. The setting time of the cement mortar doped with the accelerator is greatly shortened, the initial setting time is shorter than 2 minutes, the final setting time is shorter than 6 minutes, the 1d (Day) compressive strength is higher than 10MPa, and the 28d compressive strength rate is higher than 140%.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of an alkali-free liquid quick-setting agent for shotcrete. 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 qui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B103/12
Inventor 王万金贺奎马强张乐李晓飞
Owner BEIJING ACAD OF BUILDING ENG
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