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Preparation method of large-volume mining and dressing powder mortar

A large-volume, powder-based technology, which is applied in the field of large-volume mining and dressing powder mortar preparation, can solve the problems of poor mortar volume stability, poor freeze-thaw resistance of mortar, and reduced bond strength, so as to save raw material costs , Improve water retention rate and antifreeze performance, reduce the effect of demand

Active Publication Date: 2020-10-30
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct use without pretreatment will cause problems such as poor mortar volume stability, reduced bond strength, and poor freeze-thaw resistance of mortar.
Therefore, the proportion of powder replacing natural sand in dry mix mortar needs to be controlled below 20%, which restricts the application of powder in dry mix mortar

Method used

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  • Preparation method of large-volume mining and dressing powder mortar
  • Preparation method of large-volume mining and dressing powder mortar
  • Preparation method of large-volume mining and dressing powder mortar

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Embodiment Construction

[0021] The preferred embodiments of the present invention are given below to describe the technical solution of the present invention in detail.

[0022] The preparation method of large-volume mining and dressing powder mortar of the present invention comprises the following steps:

[0023] Step 1, powder pretreatment process: drying, raw material analysis, sieving, screening;

[0024] Step 2, mixing the powder with natural sand, adjusting the aggregate gradation after mixing, and controlling the fineness modulus of the aggregate;

[0025] Step 3: Put half of the blended aggregate with well-controlled gradation into a container equipped with an agitator, add cement, high-efficiency thickening powder, and class II fly ash mixed cementitious materials into the aggregate, stir evenly, and then add The other half is mixed with aggregate, add appropriate amount of water, stir evenly and obtain slurry;

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Abstract

The invention discloses a high-volume mining and dressing powder mortar preparation method. The method comprises the following steps: 1) powder pre-treatment: performing air drying, raw material analysis, sieving, and screening; 2) performing mixed doping on powder and natural sands, after adjusting and mixing, performing aggregates grading, and controlling the fineness modulus of the aggregates;3) placing a half of the doped aggregate with controlled grading in a container equipped with a stirrer; 4) adjusting the primary denseness and a water-retention rate of an obtained slurry for control; and 5) performing mortar construction and maintenance. The doping of the high-volume powder and modified high-efficiency thickening powder are in favor of increasing the water-retention rate and theanti-freezing performance of the mortar, the mortar compressive strength, stretching bonding intensity, long-age drying contraction value, and the water resistance performance is basically leveled with a reference, and the large-doping amount mining and dressing powder mortar has volume stability.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of large-volume mining and dressing powder mortar. Background technique [0002] According to statistics, in construction projects, 25% to 40% of cement is used to prepare M2.5-M15 construction mortar. The cement industry consumes a large amount of resources and energy and causes environmental pollution. Therefore, making full use of industrial solid waste to achieve ecological and high-performance production of building mortar has become the top priority for the development of my country's mortar industry. Ready-mixed mortar is a building material that is widely used at present. With the increasing scale of construction in our country, the amount of mortar and sand consumption is also extremely alarming. In 2003, the total production capacity of ready-mixed mortar in my country was less than 2.5 million tons. In 2012, the total output of ready-mixed mortar in my coun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/12C04B14/06C04B20/00
CPCC04B14/068C04B18/12C04B20/0088C04B28/04C04B2201/50C04B18/08C04B22/002C04B2103/30Y02W30/91
Inventor 王娟陈宁姚利君赵立群
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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