High-strength concrete prepared from river pebbles

A high-strength concrete and river pebble technology, applied in the field of concrete, can solve the problems of environmental pollution and high cost of aggregate limestone mining, and achieve the effects of protecting the environment, improving work performance and concrete strength, and reasonable particle gradation distribution

Inactive Publication Date: 2022-03-15
河北冀超新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-strength concrete prepared by using river pebbles, aiming to solve the technical problems of the above-mentioned prior art that the aggregate limestone used in the preparation of concrete is expensive to mine and causes environmental pollution

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: A kind of high-strength concrete prepared by using river pebbles provided by the present invention, each component and its content (in Kg / m³) are as follows: 450% cement, 719% sand, 1040% pebble gravel, 130% water , 50 of fly ash, 50 of mineral powder, 50 of silica fume, 12.0 of admixture.

[0018] Mix the above-mentioned components to obtain high-strength concrete. Among them, the cement uses ordinary Portland cement, P.O42.5; the pebble gravel is crushed and shaped by river pebbles with a particle size of 5-20mm, the crushing value index is ≤10%, and the needle-like particle content is <8 %; the sand is the river sand in zone II with a fineness modulus above 2.6, the mud content is ≤2.0%, and the mud content is ≤0.5%; Water agent; fly ash is Class F, Class I fly ash of power plant, fineness < 12%, loss on ignition < 5%; mineral powder is S95 grade mineral powder, specific surface area greater than 400㎡ / Kg, 28-day activity index greater than 100%; silic...

Embodiment 2

[0020] Embodiment 2: A kind of high-strength concrete prepared by using river pebbles provided by the present invention, each component and its content (in Kg / m³) are as follows: 400% cement, 719% sand, 1040% pebble gravel, 130% water , 50 of fly ash, 100 of mineral powder, 50 of silica fume, 12.0 of admixture.

[0021] Mix the above-mentioned components to obtain high-strength concrete. Among them, the cement uses ordinary Portland cement, P.O42.5; the pebble gravel is crushed and shaped by river pebbles with a particle size of 5-20mm, the crushing value index is ≤10%, and the needle-like particle content is <8 %; the sand is the river sand in zone II with a fineness modulus above 2.6, the mud content is ≤2.0%, and the mud content is ≤0.5%; Water agent; fly ash is Class F, Class I fly ash of power plant, fineness < 12%, loss on ignition < 5%; mineral powder is S95 grade mineral powder, specific surface area greater than 400㎡ / Kg, 28-day activity index greater than 100%; sili...

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Abstract

The invention discloses high-strength concrete prepared from river pebbles, and belongs to the technical field of concrete, and the high-strength concrete comprises the following components: 520-600 Kg/m of a cementing material, 130-140 Kg/m of water, 660-760 Kg/m of sand, 960-1060 Kg/m of pebble gravel and an additive, the cementing material comprises 5-10% of fly ash, 8-20% of mineral powder, 5-10% of silica fume and the balance of cement; and the admixture accounts for 1.5-2.5% of the total amount of the cementing material. The river pebbles with particle size defects eliminated through crushing and shaping are adopted as coarse aggregates, the crushed and shaped pebbles are small in needle-sheet-shaped particle content and good in particle shape, the crushing value is smaller than 10%, reasonable accumulation of aggregates in concrete and reasonable stress distribution are facilitated, overall material particle grading distribution in the high-strength concrete tends to be more reasonable, and the strength of the high-strength concrete is improved. The working performance of a concrete mixture and the strength of concrete are improved, so that resources are saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to high-strength concrete prepared by using river pebbles. Background technique [0002] Concrete is a general term for composite materials in which coarse and fine aggregates are cemented into a whole by cementitious materials, referred to as concrete, and is widely used in various civil engineering projects such as buildings, roads, and bridges. [0003] At present, with the vigorous development of the construction industry, the supply of sand and gravel is becoming increasingly tight, and the cost is gradually increasing. Traditional high-strength concrete, due to the small water-to-binder ratio, large amount of cement, and small water consumption, has high requirements on the gradation and shape of gravel particles. If the particle size is too large and the content of needle-like particles is large, it will directly affect the concrete strength and concrete mixing. Generally, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00017C04B2201/50C04B18/08C04B18/141C04B18/146C04B14/06C04B14/02C04B2103/302
Inventor 郭连柱
Owner 河北冀超新型建材有限公司
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