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Method for preparing road concrete from admixtures steel slag micro-powder, superfine slag powder and fly ash

A technology of slag micropowder and steel slag micropowder is applied in the field of building materials to achieve the effects of high working performance, excellent durability and resource saving

Inactive Publication Date: 2015-10-07
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no relevant research report on using steel slag fine powder, slag fine powder, and fly ash together as admixtures to prepare road concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0029] (1) The mass percentages of cementitious material, mixing water, coarse and fine aggregates are 18%, 7%, 45%, and 30% respectively; among them, the mass percentages of each component in cementitious material: cement 60%, steel slag powder 10%, slag micropowder 15%, fly ash 15%; water-binder ratio is controlled at 0.39; The particle size is controlled at 4.75-26.5mm, and the mass percentage of each particle size range of coarse aggregate is 15% for 4.75-9.5mm, 25% for 9.5-16mm, and 60% for 16-26.5mm; the sand rate is controlled at 40%; The agent is polycarboxylate high-efficiency water reducer and vegetable protein air-entraining agent, and the dosage is 1.5% and 1.0% respectively;

[0030] (2) Mix P.O42.5 cement, steel slag micropowder, slag micropowder, and fly ash uniformly according to the proportion in step (1) to obtain a cementitious material;

[0031] (3) Add coarse and fine aggregates and gelling materials to the forced mixer according to the ratio in step (1),...

Embodiment 3

[0035] (1) The mass percentages of cementitious material, mixing water, coarse and fine aggregates are 17%, 7%, 49%, and 27% respectively; among them, the mass percentages of each component in cementitious material: cement 70%, steel slag powder 5%, slag powder 15%, fly ash 10%; water-binder ratio is controlled at 0.41; The particle size is controlled at 4.75-26.5mm, the mass percentage of each particle size range of coarse aggregate: 25% for 4.75-9.5mm, 30% for 9.5-16mm, 45% for 16-26.5mm; the sand rate is controlled at 36%; The agent is polycarboxylate high-efficiency water reducer and vegetable protein air-entraining agent, and the dosage is 1.5% and 1.0% respectively;

[0036] (2) Mix P.O42.5 cement, steel slag micropowder, slag micropowder, and fly ash uniformly according to the proportion in step (1) to obtain a cementitious material;

[0037] (3) Add coarse and fine aggregates and gelling materials to the forced mixer according to the ratio in step (1), start the mixer...

Embodiment 4

[0041] (1) The mass percentages of cementitious material, mixing water, coarse and fine aggregates are 17%, 6%, 46%, and 31% respectively; among them, the mass percentages of each component in cementitious material: cement 45%, steel slag powder 15%, slag powder 20%, fly ash 20%; water-binder ratio is controlled at 0.35; fine aggregate adopts continuous gradation, fine aggregate particle size is controlled at 0.15-4.75mm, fineness modulus 3.0, coarse aggregate The particle size is controlled at 4.75-26.5mm, the mass percentage of each particle size range of coarse aggregate: 25% for 4.75-9.5mm, 35% for 9.5-16mm, 40% for 16-26.5mm; the sand rate is controlled at 41%; The agent is polycarboxylate high-efficiency water reducer and vegetable protein air-entraining agent, and the dosage is 2.0% and 1.0% respectively;

[0042] (2) Mix P.O42.5 cement, steel slag micropowder, slag micropowder, and fly ash uniformly according to the proportion in step (1) to obtain a cementitious mater...

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Abstract

The invention discloses a method for preparing road concrete from admixtures steel slag micro-powder, superfine slag powder and fly ash. The road concrete mainly consists of a cementing material, mixing water, coarse and fine aggregates and additives, wherein the cementing material is obtained by compounding the following components in percentage by mass: 40 to 80 percent of cement, 5 to 20 percent of steel slag micro-powder, 5 to 20 percent of superfine slag powder and 5 to 20 percent of fly ash; the water-cement ratio is controlled to be 0.35 to 0.45; the coarse and fine aggregates are continuously graded; the sand ratio is controlled to be 31 to 41 percent; the additives comprise a polycarboxylic superplasticizer and a plant protein air-entraining agent, and the doping amounts of the polycarboxylic superplasticizer and the plant protein air-entraining agent are 1.5 to 2.5 percent and 0.5 to 1.5 percent based on the mass of the cementing material respectively. The method is simple, and has remarkable economic benefits and social benefits, the prepared road concrete has breaking strength of 4.7 to 7.6MPa, and is higher in working performance, mechanical performance and durability, and the utilization rates of steel slag micro-powder, superfine slag powder and fly ash can be remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing road concrete by using steel slag micropowder, slag micropowder and fly ash as admixtures. Background technique [0002] Highway construction is the foundation of national economic construction. With the development of national economic construction, road traffic volume increases, overloading is serious, and large areas of roads are damaged early, which is far from the design service life. Due to the long-term exposure of road concrete to the natural environment, the concrete pavement is affected by the dual effects of the external environment and vehicle dynamic load, such as temperature changes, dry-wet cycles, freeze-thaw cycles, erosion of water and other harmful substances, and vehicle overloading. , making the working environment conditions of road concrete more complicated and serious than some other concretes. Therefore, the ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/14C04B18/08C04B18/12
CPCY02W30/91
Inventor 刘福田宋凯强
Owner UNIV OF JINAN
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