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Quick-setting high-alkali-activated fly ash cementing material capable of being maintained at normal temperature and preparation method of quick-setting high-alkali-activated fly ash cementing material

A technology for cementitious materials and fly ash, applied in the field of building materials, can solve the problems of low order, no water reducing agent products, and inability to achieve large-scale application in a short period of time.

Active Publication Date: 2022-05-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • Claims
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Problems solved by technology

However, the high-viscosity sodium silicate solution leads to poor workability of AAFA, and there is currently no matching water reducer product; Low resistance, easy to cause a large contraction of AAFA
It can be seen that the current AAFA prepared at room temperature cannot achieve large-scale application in a short period of time in terms of technology and performance.

Method used

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  • Quick-setting high-alkali-activated fly ash cementing material capable of being maintained at normal temperature and preparation method of quick-setting high-alkali-activated fly ash cementing material
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  • Quick-setting high-alkali-activated fly ash cementing material capable of being maintained at normal temperature and preparation method of quick-setting high-alkali-activated fly ash cementing material

Examples

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Effect test

Embodiment 1-4

[0034] In Example 1-4, a fast-setting high-strength alkali-activated fly ash cementitious material that can be cured at room temperature and its preparation method, its raw materials include the following components: 30-50 parts of undisturbed fly ash, high-activity super 50-70 parts of fine fly ash, 12-18 parts of sodium hydroxide (see Table 2 for details).

[0035] The specific preparation method is divided into two steps:

[0036] (1) Preparation of pre-excitation solution: Add 2 to 3 parts of highly active ultrafine fly ash into the prepared sodium hydroxide solution, dissolve and heat for 20 minutes at 80°C and 800r / min with a magnetic stirrer, and wait for After cooling, it becomes the pre-excitation solution. The specific process is as follows: figure 1 shown.

[0037] (2) Preparation and maintenance of alkali-activated fly ash cementitious material: mix the pre-excited solution as an alkali activator with the remaining fly ash raw materials, stir and prepare samples,...

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Abstract

The invention relates to the technical field of building materials, in particular to a quick-setting high-alkali-activated fly ash cementing material capable of being maintained at normal temperature and a preparation method of the quick-setting high-alkali-activated fly ash cementing material. The raw materials comprise the following components in parts by weight: 30-50 parts of undisturbed fly ash, 50-70 parts of high-activity superfine fly ash and 12-18 parts of sodium hydroxide. Based on the premise that a raw material system and a preparation process are simplified and feasible, under an existing raw material system, through pretreatment of fly ash and a sodium hydroxide exciting agent, AAFA which is rapid in setting and high in strength under normal-temperature curing is prepared, the AAFA is rapidly set under the normal-temperature condition, high early-stage and later-stage strength is obtained, an existing high-temperature curing step is omitted, and the production cost is reduced. And the application of the device in on-site constructional engineering is expanded.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a fast-setting high-strength alkali-activated fly ash cementitious material capable of curing at normal temperature and a preparation method thereof. Background technique [0002] Fly ash, as the main by-product of coal-fired thermal power plants, realizes its bulk resource utilization in the field of building materials is an important guarantee for the sustainable development of coal-fired and building materials industries. Alkaline activated fly ash cementitious material (AAFA, alkaline activated fly ash) is prepared by using the aluminosilicate glass in fly ash, which can form the characteristics of an amorphous three-dimensional network structure under the action of an alkaline activator. Corrosion, high temperature resistance, solidification of heavy metals and other fields can replace Portland cement, showing better performance, realizing solid waste recycling, a...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCC04B7/243Y02P40/10C04B18/08C04B28/021C04B28/006C04B22/062C04B20/026C04B20/008C04B7/527
Inventor 李辉朱绘美张煜雯张新东迂晨陈佳妮
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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