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Low strength grade concrete with sulfate corrosion resistance

A sulfate-resistant concrete technology, which is applied in the field of construction engineering materials, can solve the problems of difficult to meet the requirements of concrete strength grades and increase the cost of concrete, and achieve the effects of excellent sulfate resistance, low cost and low strength

Active Publication Date: 2015-04-01
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it is difficult to achieve the strength grade requirements of concrete in areas with poor construction conditions; on the other hand, the cost of concrete will also increase a lot accordingly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Embodiment 1: (the consumption of composite cementitious material in concrete: 320kg / m 3 ; The weight ratio of water to the composite cementitious material: 0.44:1; the proportion of superfine fly ash to the total weight of the composite cementitious material: 20%; the proportion of limestone powder to the total weight of the composite cementitious material: 7%; The ratio of slag to the total weight of the composite cementitious material: 10%; the ratio of cement to the total weight of the composite cementitious material: 63%. )

[0029] The mix ratio of embodiment 1 (kg / m 3 )

[0030] cement

Embodiment 2

[0032] The mix ratio (kg / m) of embodiment 2 3 )

[0033] cement

Embodiment 3

[0035] The mix ratio (kg / m) of embodiment 3 3 )

[0036] cement

Superfine fly ash

limestone powder

ground slag

the sand

stone

water

241.4

61.2

13.6

23.8

1907

820

153

[0037] 4. Comparative example:

[0038] The mix ratio of the comparative example (kg / m 3 )

[0039] cement

Superfine fly ash

limestone powder

ground slag

the sand

stone

water

500

0

0

0

757

1003

190

[0040] Performance comparison:

[0041] 1. 28-day strength of concrete

[0042] Example 1: 38.4MPa

[0043] Example 2: 42.2MPa

[0044] Example 3: 40.7MPa

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Abstract

The invention relates to low strength grade concrete with sulfate corrosion resistance and belongs to the technical field of construction materials. The concrete is formed by mixing a composite cementitious material, water, sand and stone and is characterized in that the composite cementitious material consists of cement, ultrafine fly ash, limestone flour and ground slag; the composite cementitious material comprises the following components in percentage by weight based on the total weight of the composite cementitious material: 15-20 percent of ultrafine fly ash, 3-7 percent of limestone flour, 5-10 percent of grounded slag and 63-77 percent of cement; the usage amount of the composite cementitious material in the concrete is 320-350kg / m<3>; and the weight ratio of water to the composite cementitious material is (0.44-0.47):1. The sulfate corrosion resistance of the low strength grade concrete disclosed by the invention is superior to that of high strength grade concrete, and the low strength grade concrete is low in construction cost and can be applied to a concrete structure in a saline soil environment.

Description

technical field [0001] The invention belongs to the technical field of building engineering materials, in particular to the composition design of low-strength grade concrete. Background technique [0002] Saline soil is widely distributed in my country, and saline soil contains a large amount of sulfate. When concrete or reinforced concrete buildings are in the service environment of saline soil, sulfate corrosion will have a continuous erosion effect on concrete, seriously affecting the quality of the building. life. Therefore, improving the sulfate corrosion resistance of concrete is an important measure to prolong the service life of buildings. In the design of concrete or reinforced concrete structures in saline soil areas, it is necessary to meet the requirements of structural force and durability. Since the service environment of saline soil erosion is relatively harsh, in order to meet the requirements of durability, concrete The strength level of concrete is usually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08
Inventor 王强严福章于明国朱红英
Owner STATE GRID CORP OF CHINA