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Low-shrink alkali slag cement composition and preparation method thereof

A slag cement, low shrinkage alkali technology, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of easy cracking, high strength, large shrinkage, etc., and achieve normal setting time and curing strength. High, small shrinkage effect

Inactive Publication Date: 2012-10-24
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-shrinkage alkali slag with normal setting time, high strength after hardening, and small shrinkage in view of the shortcomings of the existing alkali slag cement, such as too fast setting, large shrinkage during the hardening process and environmental drying, and easy cracking. cement composition

Method used

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  • Low-shrink alkali slag cement composition and preparation method thereof
  • Low-shrink alkali slag cement composition and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] A kind of alkali slag cement composition, by 80% slag powder (S75), 10% sodium hydroxide and 10% lightly burned magnesia (activated MgO 60.6%, 0.08mm sieve allowance 1.5%), add sodium hydroxide and It is made of 1% aluminum stearate combined with light-burned magnesia.

[0022] Sodium hydroxide is pulverized into 0.08mm square hole sieve residue with pulverizer and is the powder of 1.2%, then described sodium hydroxide powder, described light-burned magnesia powder and described aluminum stearate are poured into heatable In a high-speed mixer, it was stirred at 180°C for 4 minutes and then naturally cooled to room temperature to obtain aluminum stearate-coated sodium hydroxide-magnesia composite powder; the granulated blast furnace slag powder and the aluminum stearate-coated Pour the sodium hydroxide-magnesia composite powder into the closed mixer in turn, and stir evenly.

Embodiment 2

[0024] A kind of alkali slag cement composition, by 80% slag powder (S75), 8% sodium hydroxide and 12% lightly burned magnesia (activity 70.4%, 0.08mm sieve residue is 4.85%), add sodium hydroxide and It is made of 2% aluminum stearate combined with light-burned magnesia.

[0025] Alkali slag cement was prepared by the same method as in Example 1, wherein the sodium hydroxide powder sieve balance was 0.5%, the aluminum stearate coating was stirred at a temperature of 180° C., and stirred for 5 minutes.

Embodiment 3

[0027] A kind of alkali slag cement composition, by 86% slag powder (S75), 6% sodium hydroxide and 8% light-burned magnesia (activity 70.4%, 0.08mm sieve residue is 4.95%), add sodium hydroxide and It is made from 3% aluminum stearate of light-burned magnesia.

[0028] Alkali slag cement was prepared by the same method as in Example 1, wherein the sodium hydroxide powder sieve residue was 1.9%, the aluminum stearate coating was stirred at a temperature of 190° C., and stirred for 5 minutes.

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Abstract

The invention provides a low-shrink alkali slag cement composition and a preparation method thereof. The low-shrink alkali slag cement composition is characterized by being prepared from 80-90 percent of granulated blast furnace slag, 4-10 percent of sodium hydroxide, 4-12 percent of light calcined magnesia and aluminum stearate, wherein the aluminum stearate accounts for 1-4 percent of the totalmass of the sodium hydroxide and the light calcine magnesia. The preparation method comprises the following steps of: crushing the sodium hydroxide into powder through a crusher, wherein the size of the powder is 0.08mm and the screen residue weight through a square hole screen is 0.5-2 percent; pouring the sodium hydroxide powder, light calcined magnesia powder and the aluminum stearate into a heatable high-speed stirrer; stirring for 4-5min at a temperature of 160-200 DEG C and naturally cooling to room temperature to prepare sodium hydroxide-magnesia composite powder coated by the aluminumstearate; and sequentially pouring the granulated blast furnace slag powder and the sodium hydroxide-magnesia composite powder coated by the aluminum stearate into a closed stirrer, and evenly stirring to obtain the low-shrink alkali slag cement composition. The low-temperature alkali slag cement composition stirred with water has the initial settling time of more than 45min, the final settling time of not more than 240min, high strength after hardening, and small shrink.

Description

technical field [0001] The present invention relates to an alkali slag cement composition, in particular to an alkali slag cement composition with normal setting time and adjustable as required, high strength and small shrinkage after hardening; the present invention also relates to this alkali slag cement method of preparation. Background technique [0002] Alkali slag cement is composed of finely ground blast furnace slag and alkaline activator. It is a new type of cementitious material with fast setting, early strength, high strength and excellent heat resistance, frost resistance and corrosion resistance. It has broad application prospects in civil engineering, transportation, electric power, seaport and other projects. [0003] The main hydration products of alkali slag cement are hydrated silicate and hydrated aluminosilicate gel. These products have strong cementing ability, and the hardened body formed has good mechanical properties, but its drying shrinkage is very...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/153
CPCC04B20/1025C04B28/10Y02W30/91C04B14/02C04B14/06C04B18/141C04B22/062C04B24/045C04B40/0028C04B14/304
Inventor 方永浩顾亚敏刘军峰吕正龙袁雪莲余韬
Owner HOHAI UNIV