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Preparation method of alkali-free and chloride-free liquid accelerator

A technology of accelerator and liquid, which is applied in the field of building materials, can solve the problems of high particle size requirements of raw materials and obstacles to the commercial application of accelerators, and achieve the effects of optimizing performance, improving adaptability and later strength, and strong adaptability

Inactive Publication Date: 2016-03-16
SICHUAN SHANXI DEEP NEW BUILDING MATERIALS SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quick-setting agent produced by this method has the advantage of fast setting speed, but it has high requirements on the particle size of raw materials, and the later strength ratio can only reach 80%, which hinders the commercial application of the quick-setting agent

Method used

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  • Preparation method of alkali-free and chloride-free liquid accelerator

Examples

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Embodiment 1

[0030] Add deionized water to the pulverized and dried bentonite and stir to form a suspension with a mass fraction of 15%, then add a polyethylene glycol solution with a mass fraction of 5% to the above suspension and mix evenly, and place it in the React at 70°C for 1 hour, filter with suction, dry and grind to obtain modified bentonite. At 30°C, add 28% aluminum sulfate to the sodium citrate solution with a mass fraction of 6% to prepare aluminum hydroxide colloid, and at 50°C, dissolve 2% aluminum sulfate in deionized water, and add pre- The prepared aluminum hydroxide colloid is prepared as a polyaluminum sulfate mother liquor, and at 50°C, 5% of polycarboxylate water reducer and 3% of polyethylene glycol-modified bentonite are added to the above polyaluminum sulfate mother liquor As a modifying agent, 0.5% stabilizer and 0.1% thickener, after adding phosphoric acid to adjust the pH to 4-6, the alkali-free and chlorine-free liquid quick-setting agent is prepared. When th...

Embodiment 2

[0032] Add deionized water to the pulverized and dried bentonite and stir to form a suspension with a mass fraction of 17%, then add a polyethylene glycol solution with a mass fraction of 7% to the above suspension and mix evenly, and place it in React in water at 75°C for 1 hour, filter with suction, dry and grind to obtain modified bentonite. At 35°C, add 34% aluminum sulfate to a 6% sodium citrate solution to obtain a colloid, and at 65°C, dissolve 4% aluminum sulfate in deionized water, and add pre-prepared Aluminum hydroxide colloid is used to prepare the mother liquor of polyaluminum sulfate. Under the condition of 55°C, 8% of polycarboxylate water reducer and 7% of bentonite modified by polyethylene glycol are added to the mother liquor of polyaluminum sulfate as modified agent, 1.5% stabilizer and 0.3% thickener, and phosphoric acid is added to adjust the pH to 4-6 to obtain an alkali-free and chlorine-free liquid quick-setting agent. When the amount of accelerator is...

Embodiment 3

[0034]Add deionized water to the pulverized and dried bentonite and stir to form a suspension with a mass fraction of 19%, then add a polyethylene glycol solution with a mass fraction of 8% to the above suspension and mix evenly, and place it in the React for 1.5 hours at 80°C in water, filter with suction, dry and grind to obtain modified bentonite. At 40°C, add 38% aluminum sulfate to a 7% sodium citrate solution to obtain a colloid, and at 70°C, dissolve 6% aluminum sulfate in deionized water, and add pre-prepared Aluminum hydroxide colloid is used to prepare the mother liquor of polyaluminum sulfate. Under the condition of 60°C, 10% of polycarboxylate water reducer and 10% of bentonite modified by polyethylene glycol are added to the mother liquor of polyaluminum sulfate as modified agent, 2.5% stabilizer and 0.4% thickener, and adding phosphoric acid to adjust the pH to 4-6 to obtain an alkali-free and chlorine-free liquid quick-setting agent. When the amount of accelera...

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Abstract

The invention discloses a preparation method of an alkali-free and chloride-free liquid accelerator. The liquid accelerator is prepared from the following raw materials: 30%-55% of aluminum sulfate, 6%-8% of sodium citrate, 5%-14% of a polycarboxylate superplasticizer, 3%-15% of a modifier, 0.5%-5% of a stabilizer, 0.1%-1% of a thickener phosphoric acid for adjusting the pH value to 4-6 and the balance of water. When the mixing amount of the accelerator prepared by the method is 4%-6%, the initial setting time is 1.5-3.0 minutes; the final setting time is 5.0-6.0 minutes; the compressive strength of 1d is greater than 10MPa; and compared with a blank mortar block, the compressive strength rate of 28d reaches 100%. Compared with a conventional accelerator, setting and hardening of cement mortar can be effectively accelerated; and the accelerator prepared by the method has good adaptability to cement, high long-term strength, stable system property, low dust concentration and practical application value.

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 and chlorine-free liquid quick-setting agent. Background technique [0002] Traditional powder accelerators have disadvantages such as slow dissolution rate and difficult dispersion, and can only be applied to dry spraying process construction. At the same time, most powder accelerators contain strong alkaline substances, which can easily cause damage to the eyes and skin of construction workers, and easily lead to reduced concrete strength, surface cracking, peeling or even collapse. Studies have shown that the 28d compressive strength retention rate of powder accelerator is generally about 65%, which seriously restricts its application in water conservancy, tunnel and other projects. In recent years, the continuous development of wet shotcrete technology has accelerated the widespread use of wet shotcrete. The comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/12
Inventor 陈建峰崔永固付海林张亚莉
Owner SICHUAN SHANXI DEEP NEW BUILDING MATERIALS SCI & TECH CO LTD
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