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Sodium silicate alkali activated slag concrete recycling method

A technology of alkali excitation and concrete, which is applied in the direction of cement production, etc., can solve problems affecting coordinated development, aggravating urban land, resource shortages, etc., and achieves the effects of saving limestone resources, realizing reuse, significant economy and operability

Active Publication Date: 2015-03-04
安康盛美宝新型环保建材有限公司
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  • Abstract
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Problems solved by technology

However, similar to traditional Portland cement, alkali-activated slag concrete will still produce a large amount of construction waste after its service, and construction waste has aggravated the tension of urban land and resources in my country, seriously affecting the coordination of social economy and ecological environment Therefore, it is imminent to do a good job in the recycling of construction waste

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  • Sodium silicate alkali activated slag concrete recycling method

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Embodiment Construction

[0013] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0014] The sodium silicate alkali-activated slag concrete recycling method of the present invention first measures the chemical composition of sand (i.e. fine aggregate), stone (i.e. coarse aggregate) and slag used in the preparation of concrete. Under normal circumstances, its composition (mass percentage) index as follows:

[0015] Sand: 1-2% loss on ignition, 2-5% CaO, 60-80% SiO 2 , 10-15% Al 2 o 3 , 2-4% Fe 2 o 3 , 0-2% MgO, 1-6% R 2 O, and the balance of impurities;

[0016] Stone: 20-35% loss on ignition, 30-40% CaO, 10-20% SiO 2 , 1-3% Al 2 o 3 , 0-2% Fe 2 o 3 , 2-18% MgO, 0-1.5% R 2 O, and the balance of impurities;

[0017] Slag: 1-2% loss on ignition, 40-65% CaO, 15-25% SiO 2 , 1-5% Al 2 o 3 , 1-8% Fe 2 o 3 , 1-8% MgO, 0-2% R 2 O, and the balance of impurities.

[0018] In this embodiment, the specific selection pa...

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Abstract

The invention discloses a sodium silicate alkali activated slag concrete recycling method comprising the steps of firstly, carrying out proportioning calculation to obtain the ratio of coarse aggregates to fine aggregates, wherein the coarse aggregates and the fine aggregates have the similar chemical components with that of slag chemical components except ignition loss and water content; then, uniformly mixing the aggregates with the ratio and sodium silicate serving as an alkali activator to prepare an alkali activated cementing material, namely concrete; and after the service of the concrete is ended, calcining the concrete at the temperature of 1450-1500 DEG C, and carrying out water quenching to obtain an activated cementing material again so as to realize the recycle of a sodium silicate alkali activated cementing material. By using the sodium silicate alkali activated slag concrete recycling method, the recycle of alkali activated concrete is realized, and the limestone resource can be saved; and the sodium silicate alkali activated slag concrete recycling method has remarkable economical efficiency and operability.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for using sodium silicate alkali to activate slag concrete by designing the concrete mix ratio and performing secondary calcination and recycling. Background technique [0002] Slag is the main solid waste in the metallurgical industry, and its main components are silicate and aluminosilicate. Slag is a latent hydraulic material, and the activity of slag can be stimulated to generate strength after adding alkali activator. Using the alkali-activated slag instead of cement to prepare alkali-activated slag concrete can reduce a series of problems such as environmental pollution, ecological damage, energy waste, and resource depletion in the production process of Portland cement. However, similar to traditional Portland cement, alkali-activated slag concrete will still produce a large amount of construction waste after its service, and construction waste has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B7/24
CPCY02P40/10
Inventor 李辉李婷徐德龙宋强张肖艳朱建辉王储
Owner 安康盛美宝新型环保建材有限公司
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