A concrete mix design method based on the anti-chloride ion intrusion performance and strength index requirements

A mix ratio design and strength index technology, which is applied in the field of concrete mix ratio design based on the anti-chloride ion intrusion performance and strength index requirements, can solve the problems of not establishing the chloride ion diffusion coefficient, ignoring the age attenuation characteristics of the chloride ion diffusion coefficient, etc. , to achieve the effect of guaranteeing the design service life

Active Publication Date: 2015-10-28
GUANGXI UNIV
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Problems solved by technology

However, this method does not establish a calculation model for the chloride ion diffusion coefficient and the water-binder ratio, and ignores the influence of fly ash, mineral powder and other mineral admixtures on the chloride ion diffusion coefficient of concrete and the age attenuation characteristics of the chloride ion diffusion coefficient. Therefore, it is also difficult to carry out the concrete mix design according to the predetermined durability and strength design parameters.
In summary, the traditional mix design method fails to incorporate the durability parameters of concrete into the calculation model, and it is difficult to carry out quantitative durability design according to the strength and durability indicators

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  • A concrete mix design method based on the anti-chloride ion intrusion performance and strength index requirements
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  • A concrete mix design method based on the anti-chloride ion intrusion performance and strength index requirements

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specific example

[0025] This embodiment is a specific example of a concrete mix design method based on the requirements of chloride ion intrusion resistance and strength index, including the following steps:

[0026] 1. Determine the design parameters such as working performance parameters, strength indicators and chloride ion intrusion resistance performance indicators of concrete materials:

[0027] A concrete wall is located in the offshore atmospheric area of ​​Beibu Gulf in my country. The design service life is 50 years. The project adopts the method of pumping concrete for construction. According to the requirements of concrete work performance for pumping construction, the concrete slump is determined to be 180mm ;According to the load-bearing capacity requirements of the concrete wall, the concrete design strength grade is determined to be C30; according to the indicators such as the marine environment action grade, the design service life and the thickness of the concrete protective la...

Embodiment 2

[0054] This embodiment is another specific example of a concrete mix ratio design method based on the anti-chloride ion intrusion performance and strength index requirements, including the following steps:

[0055] 1. Determine the design parameters such as working performance parameters, strength indicators and chloride ion intrusion resistance performance indicators of concrete materials:

[0056]A concrete column is located in the seawater splash area in East China, with a design service life of 100 years. The project adopts the method of pumping concrete for construction. According to the requirements of concrete performance for pumping construction, the slump requirement of concrete is determined as 180mm; according to the load-bearing capacity requirements of the concrete slab, the concrete design strength grade is determined to be C40; according to the marine environment level of the concrete column, the design service life and the thickness of the concrete protective la...

Embodiment 3

[0088] This embodiment is a verification embodiment of Embodiment 1 to Embodiment 2. The correctness of the verification method is verified by carrying out the concrete preparation of the corresponding mix ratio and the determination of the chloride ion diffusion coefficient test:

[0089] 1. According to the concrete mix ratio designed in Example 1, that is, the water consumption is 160kg, the cement consumption is 262kg, the fly ash consumption is 46kg, the mineral powder consumption is 0kg, the sand consumption is 734kg, and the gravel consumption is 1198kg, and the concrete trial mix and specimen preparation are carried out , after 28 days of curing under standard curing conditions, the chloride ion diffusion coefficient of the concrete specimen measured according to the test method for long-term performance and durability of ordinary concrete provided by GB / T 50082-2009 is 7.20×10 -12 m 2 / s, according to the test method of ordinary concrete mechanical properties provided...

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Abstract

The invention relates to a design method of concrete mix ratio based on requirements of an index of resistance to chloride ion intrusion and a strength index. The design method comprises the following steps: (1) determining design parameters of working performances, a strength index and an index of resistance to chloride ion intrusion of concrete material; (2) determining raw materials adopted for preparing concrete; (3) calculating a strength preparation value of the concrete and a diffusion coefficient preparation value of chloride ions; (4) determining a water-cement ratio calculation model; (5) determining a diffusion coefficient calculation model of the chloride ions and an age decay coefficient calculation model; (6) calculating the water-cement ratio of the concrete and the mixing amount of a mineral admixture; (7) checking the calculation of the mixing amount of the mineral admixture and the water-cement ratio; (8) determining the water consumption per square meter and the sand ratio of the concrete; (9) calculating the concrete mix ratio. Through the method, the requirements of the index of resistance to the chloride ion intrusion and the strength index, stipulated by the 28-day-age concrete, can be met.

Description

1. Technical field [0001] The invention relates to a concrete mix ratio design method based on the requirements of chloride ion intrusion resistance performance and strength index, which can incorporate the chloride ion intrusion resistance performance index and strength index of concrete into the calculation model at the same time, and perform concrete mix through calculation and quantitative analysis It is a method to make the prepared concrete meet the durability requirements and strength requirements in the chloride-salt environment at the same time. 2. Background technology [0002] Under the chloride salt environment, the steel bars in the concrete structure will be corroded due to the corrosion of chloride ions, which will cause cracking and spalling of the concrete. In severe cases, the durability of the concrete structure will be damaged, resulting in economic losses and endangering people's work and safety. [0003] The chloride ion diffusion coefficient and age at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
Inventor 杨绿峰陈正周明文涛赵家琦
Owner GUANGXI UNIV
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