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Air entrained concrete

A technology of concrete and air content, which is applied in the field of concrete, can solve the problems of reducing the strength of concrete, the influence of air-entraining agents on the durability of concrete is rarely considered, and the major technical and economic benefits of air-entraining agents are not clearly understood, so as to improve the strength, Ensure traffic capacity and comfort, reduce maintenance costs

Inactive Publication Date: 2013-05-15
HEILONGJIANG PROV INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]The main factor affecting the wide application of air-entraining agents is that many engineers and technicians have no clear understanding of the major technical and economic benefits of using air-entraining agents, and there are even some misunderstandings. The use of air-entraining agents will reduce the strength of concrete, but the influence of air-entraining agents on the durability of concrete is rarely considered

Method used

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Effect test

specific Embodiment approach 1

[0036] Specific implementation mode one: the mix ratio design process of the air-entraining concrete of the present implementation mode is as follows (sample):

[0037] 1. Determine the design indicators and design parameter values:

[0038] 1) Physical and mechanical indexes of mixture and hardened concrete

[0039] Air-entrained concrete design flexural tensile strength: ≥5.0MPa;

[0040] Air-entraining concrete air content: 5.5±0.5%;

[0041] Air-entrained concrete water-cement ratio (W / C): ≤0.40;

[0042] Slump of air-entrained concrete mixture: 25~50mm;

[0043] Air-entrained concrete frost resistance grade: ≥F300;

[0044] Air-entrained concrete flexural tensile elastic modulus: ≥30000MPa.

[0045] 2) Values ​​of mix design parameters

[0046] -28 The mean value of the flexural and tensile strength of the concrete preparation, and the calculation results;

[0047] - Design standard value of flexural tensile strength, 5.0MPa;

[0048] t -Guarantee rate coeff...

specific Embodiment approach 2

[0122] Specific implementation mode two: In this implementation mode, the air-entraining concrete mix design adopted by a certain grade of highway cement concrete pavement is taken as an example, and the detailed calculation and test adjustment are as follows:

[0123] Assuming that the design bending and tensile strength of a certain grade of road is 5.0MPa, in order to meet the requirements of frost resistance, the air content is (5±0.5)%, the synovial film paving is adopted, and the paving slump is controlled at 3~5cm.

[0124] 1. Raw materials:

[0125] 1. Cement: Harbin Yatai P·O4 2.5 grade cement.

[0126] 2. Crushed stone: choose the 4.75~26.5cm continuous graded gravel made of three grades of compound.

[0127] 3. Sand: medium sand, fineness modulus 3.0.

[0128] 4. Water: drinking water.

[0129] 5. Admixture: compound type of air-entraining, high-efficiency water-reducing and retarding, liquid, dosage ≤ 3.0%.

[0130] 2. Mixing ratio calculation process

[0131]...

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Abstract

The invention provides an air entrained concrete and relates to a concrete. The air entrained concrete provided by the invention comprises cement, a fine aggregate, a coarse aggregate, an additive and water, wherein the additive accounts for 2-3 wt% of the cement. The air entrained concrete provided by the invention can be used in paving to improve performances such as strength and impermeability, so as to greatly improve the durability of the pavement, greatly reduce the cost of repair and maintenance, and ensure the traffic capacity and comfort of the road. The main technical parameters of the air entrained concrete are as follows: 1) design flexural strength of the air entrained concrete: >=5.0Mpa; 2) gas content of the air entrained concrete: 5.5 + / - 0.5%; 3) water-cement ratio (W / C) of the air-entrained concrete: <=0.40; 4) slump of the air entrained concrete mixture: 25-50mm; 5) flexural elastic modulus of the air entrained concrete: >=30000Mpa; and 6) antifreeze grade of the concrete: >=F300.

Description

technical field [0001] The invention relates to a concrete, in particular to a concrete using an air-entraining agent. Background technique [0002] There are different degrees of poor durability of pavement concrete in cold regions of our country. Many highways, urban roads and overpass projects cannot reach the design service life, that is, durability damage such as frost heave peeling, local peeling, and surface wear occurs. Having to carry out frequent repairs and renovations will inevitably cost a huge amount of maintenance and reconstruction costs, resulting in a great waste of energy and resources. [0003] Cement concrete pavement in cold regions is often broken and damaged prematurely under the action of ice and snow freezing and thawing, which is far from reaching the service life of the design index. According to expert analysis, one of the main reasons for shortening the service life of roads in cold regions is the frost heave of the subgrade and the freeze-thaw...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 杨洪生尚云飞江文智于立泽宇德忠王雪梅卜晓新丛晓丽郑毅刘亦萍
Owner HEILONGJIANG PROV INST OF COMM
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