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Slag-based alkali-activated cementing material as well as preparation method and application thereof

A gelling material and slag-based technology, which is applied in the field of building materials, can solve the problems of uncertain performance of gelling materials stored in water glass, increase in the complexity of the preparation process of gelling materials, and decrease in the stability of water glass. Easy to adjust, broad market application prospects, and low production costs

Active Publication Date: 2021-02-26
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This undoubtedly further increases the complexity of the preparation process of the gelled material
In addition, when the modulus is too low, the water glass is very easy to crystallize due to the decrease in stability
This has caused great uncertainty for the storage and transportation of water glass and the performance of the prepared cementitious materials.

Method used

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  • Slag-based alkali-activated cementing material as well as preparation method and application thereof
  • Slag-based alkali-activated cementing material as well as preparation method and application thereof
  • Slag-based alkali-activated cementing material as well as preparation method and application thereof

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preparation example Construction

[0067] The present invention also provides a preparation method of slag-based alkali-activated gelling material, comprising the following steps:

[0068] a. Mix 70-99 parts of slag with 1-30 parts of silicon-calcium slag to obtain composite powder;

[0069] bPress Na 2 The ratio of O content to 1% to 5% of the mass of the composite powder and the 0.5 water-cement ratio set by GB / T 17671 are used to mix the water glass and water evenly to obtain the activator solution;

[0070] c. Add the composite powder obtained in step a to the activator solution obtained in step b, and stir evenly to obtain the slag-based alkali-activated gelling material.

[0071] The present invention also provides a building material, which includes the above-mentioned slag-based alkali-activated gelling material.

[0072] During specific implementation, the building material may be mortar or concrete or the like.

Embodiment 4-20

[0105] Mix silicon-calcium slag and commercially available S95 grade slag powder in proportions of 5:95, 10:90, 20:80, and 30:70 to obtain composite micropowders with different ratios of silicon-calcium slag / slag; Industrial-grade water glass with a concentration of 2.35, 2.78, and 3.23 is used as the activator, and the dosage of the activator is 1wt%, 3wt%, 5wt%, respectively, the water-cement ratio is 0.5, and the cement-sand ratio is 1:3. Refer to GB / T 17671 "Cement Mortar Strength Test Method (ISO Method)" carries out the preparation, maintenance and strength performance test of slag-based alkali-activated mortar samples at various ages, and refers to GB / T under the same activator dosage and water-cement ratio. 1346 "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Method" is used to determine the setting time of cementitious materials stimulated by slag-based alkali. The results are shown in Table 4 below.

[0106] Table 4 Properties of dif...

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Abstract

The invention relates to a slag-based alkali-activated cementing material and a preparation method and application thereof, and the slag-based alkali-activated cementing material comprises the following components: 70-99 parts by mass of slag; 1-30 parts by mass of calcium silicate slag; an alkali activator accounting for 1%-5% of the total mass of the slag and the calcium silicate slag in the content of Na2O in the alkali activator. Compared with an existing alkali-activated slag cementing material and a preparation technology thereof, the slag-based alkali-activated cementing material provided by the invention has the advantages that the strength performance is excellent, the setting time is easy to adjust, the alkali doping amount is low, the modulus of an excitant does not need to be adjusted in advance, and the like, so that the cost is relatively low, the preparation process is simple, and the market application prospect is wide.

Description

technical field [0001] The invention relates to a slag-based alkali-activated gelling material and its preparation method and application, belonging to the field of building materials. Background technique [0002] Alkali-activated gelling material refers to a new type of inorganic hydraulic gelling material that uses alkali as an activator to make solid raw materials produce gelling activity through the excitation of alkali. Solid raw materials usually refer to silica-alumina raw materials with potential gelling activity; alkali activators are usually caustic alkali (MOH, M is alkali metal, the same below) and soluble alkali metal salt (M 2 CO 3 , M 2 SO 4 , M 2 O nSiO 2 Wait). Due to its stable production process and high potential gelling activity, slag is one of the most widely used raw materials in the research process of alkali-activated gelling materials. Alkali-activated cementitious materials prepared from slag are usually called alkali-activated slag cement / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/14C04B28/00
CPCC04B7/243C04B7/14C04B28/006C04B2201/50Y02P40/10
Inventor 史迪叶家元张文生李柱国
Owner CHINA BUILDING MATERIALS ACAD
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