Method for preparing large-mixing-amount low-quality mineral admixture recycled cement-based product through microwave curing

A technology of recycled cement and microwave curing, which is applied in the field of building materials to achieve the effect of improving interface bonding performance, improving rapid improvement, and promoting the growth of mechanical properties

Active Publication Date: 2019-11-29
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned technical solutions are only aimed at the utilization of low-quality mineral admixtures or the treatment of recycled aggregates, respectively
For the preparation of cement-based materials usi

Method used

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  • Method for preparing large-mixing-amount low-quality mineral admixture recycled cement-based product through microwave curing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for microwave curing to prepare a large amount of low-quality mineral admixture recycled cement-based products, including:

[0031] (1) Vacuum environment treatment uses alkaline solution to immerse 5-25mm continuously graded regenerated coarse aggregate in a closed container, then evacuates to below 10mbar, keeps for 24h, drains until saturated surface dry, the alkaline solution is hydroxide Sodium aqueous solution (concentration 5M); (2) ultrasonically disperse and mix the mixture of the treated regenerated coarse aggregate, grade III fly ash, water and dispersant, and then evacuate to below 10mbar again for 2h; (3) put Cement, river sand and the above mixture are evenly mixed in a mixer, and molded; (4) microwave curing for 30 minutes under the condition of maximum output power of 30%, and then stop heating for 30 minutes, and cycle twice to obtain the cement-based product.

Embodiment 2

[0033] A method for microwave curing to prepare a large amount of low-quality mineral admixture recycled cement-based products, including:

[0034] (1) Vacuum environment treatment uses alkaline solution to immerse 5-25mm continuously graded regenerated coarse aggregate in a closed container, then vacuumize to below 10mbar, keep for 24h, drain until saturated surface dry, the alkaline solution is sodium carbonate Aqueous solution (concentration 1.5M); (2) ultrasonically disperse and mix the mixture of the treated regenerated coarse aggregate, S75 grade mineral powder, water and dispersant, and then evacuate the mixture below 10mbar again for 2h; (3) put the cement 1. Mix the river sand and the above-mentioned mixture evenly in the mixer, and mold it; (4) microwave curing for 30 minutes under the condition of maximum output power of 30%, and then stop heating for 30 minutes, and cycle twice to obtain the cement-based product.

Embodiment 3

[0036] A method for microwave curing to prepare a large amount of low-quality mineral admixture recycled cement-based products, including:

[0037] (1) Vacuum environment treatment uses alkaline solution to immerse 5-25mm continuously graded regenerated coarse aggregate in a closed container, then vacuumize to below 10mbar, keep for 24h, drain until saturated surface dry, the alkaline solution is silicic acid Potassium aqueous solution (modulus 2.0, concentration 15%); (2) ultrasonically disperse and mix the mixture of the treated regenerated coarse aggregate, low-quality metakaolin, water and dispersant, and then vacuum again to below 10mbar for 2h; (3) Mix cement, river sand and the above-mentioned mixture in the mixer evenly, and mold it; (4) Under the condition of maximum output power of 30%, stop heating for 30 minutes after microwave curing for 30 minutes, and circulate twice to obtain the described Cement based products.

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Abstract

The invention discloses a method for preparing a large-mixing-amount low-quality mineral admixture recycled cement-based product through microwave curing. The preparation method of the recycled cement-based product comprises the following steps: mixing a recycled aggregate with alkali liquor in a vacuum environment, ultrasonically dispersing and mixing a mixture of the alkali-treated recycled aggregate, a low-quality mineral admixture, a dispersing agent and the water, putting the mixture into the vacuum environment again, adding cement and a fine aggregate, stirring and molding, and curing and accelerating coagulation of a molded cement-based product under the action of microwaves. According to the method, the hydration hardening rate of cement-mineral admixture slurry can be increased through the microwave effect, and early performance increase of the cement-based product is promoted; besides, under the action of the microwaves, the modification effect of the alkali liquor on the recycled aggregate and the alkali-activated activity of the low-quality mineral admixture are subjected to accelerated reaction in pores of the recycled aggregate, filling is compact, the defects that the recycled aggregate is large in porosity, large in water absorption rate and the like can be effectively overcome, and the long-term mechanical property and durability of a cement-based product are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing a large-volume low-quality mineral admixture recycled cement-based product through microwave curing. Background technique [0002] With the development of my country's economy, a large amount of industrial solid waste and construction waste are produced in the process of industrial production and urbanization acceleration. Compared with developed countries, the level of comprehensive utilization of construction waste resources in my country is relatively low, and the recycling of solid waste is still in the exploratory stage. Low-quality fly ash and slag are the vast majority of industrial solid waste. Most of the construction waste represented by waste concrete is mainly disposed of in open-air stacking and landfill. If the above-mentioned solid waste cannot be rationally utilized, It will become the soft underbelly and flaw that af...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B40/02C04B20/10B28B11/24
CPCB28B11/241B28B11/245C04B20/1066C04B20/107C04B20/1074C04B28/04C04B40/0218C04B2201/50C04B18/08C04B22/002C04B2103/32C04B18/16C04B14/068C04B18/141C04B14/106
Inventor 王浩刘加平于诚姜骞余鑫张茜
Owner JIANGSU SOBUTE NEW MATERIALS
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