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Concrete for high-durability construction

A kind of durability and concrete technology, applied in the field of construction materials, can solve the problems of anti-chloride ion permeability crossover, long construction period, etc., achieve good durability, wide application range, and improve durability

Inactive Publication Date: 2020-03-27
冀东海德堡(泾阳)水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the frost resistance and chloride ion permeability of concrete are crossed, so it is not suitable for the construction requirements of high durability. In the process of construction of large road sections, the construction period is long, and the smog Influenced by the impact, construction is often stopped in winter, which has a certain test on the durability of concrete

Method used

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  • Concrete for high-durability construction
  • Concrete for high-durability construction
  • Concrete for high-durability construction

Examples

Experimental program
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Effect test

Embodiment 1

[0042]In this embodiment, the concrete includes the following raw materials in parts by mass:

[0043] 155 parts of cement, 110 parts of limestone powder, 20 parts of mineral powder, 780 parts of water sand, 1160 parts of pebble, 1010 parts of crushed stone and 155 parts of water;

[0044] In the present embodiment, the specific surface area of ​​limestone powder is 550m 2 / kg.

[0045] In the present embodiment, the unit water consumption of limestone powder is 8Kg; Calcium carbonate content is 80%, and the flow ratio of limestone powder is 100%; Particle diameter is 20mm; The methylene blue value of limestone powder is 0.6.

[0046] In the prior art, the calcium carbonate content in the limestone powder is mostly stipulated to be not less than 75%. Although it meets the requirements, the calcium carbonate in the limestone powder is hydrated with cement to produce basic calcium carbonate, and CaCO 3 to C 3 S hydration has a good promoting effect and can increase strength, ...

Embodiment 2

[0051] In this embodiment, the concrete includes the following raw materials in parts by mass:

[0052] 400 parts of cement, 80 parts of limestone powder, 60 parts of mineral powder, 750 parts of water sand, 1150 parts of pebble, 980 parts of crushed stone and 160 parts of water;

[0053] In the present embodiment, the specific surface area of ​​limestone powder is 550m 2 / kg.

[0054] In the present embodiment, the unit water consumption of limestone powder is 8Kg; Calcium carbonate content is 85%, and the flow ratio of limestone powder is 100%; Particle diameter is 20mm; The methylene blue value of limestone powder is 0.8.

[0055] In this embodiment, the apparent density of crushed stone is 2710kg m -3 , the bulk density of the crushed stone is 1570, the needle flake content of the crushed stone is 5%, the crushing value of the crushed stone is 10%, and the gradation of the crushed stone is 5mm.

[0056] In this embodiment, fly ash is also included, and the added amount ...

Embodiment 3

[0061] In this embodiment, the concrete includes the following raw materials in parts by mass:

[0062] 155 parts of cement, 60 parts of limestone powder, 20 parts of mineral powder, 780 parts of water sand, 1010 parts of gravel and 160 parts of water;

[0063] In this embodiment, although there are no pebbles, the strength of concrete is provided by crushed stones and mineral powder.

[0064] In the present embodiment, the specific surface area of ​​limestone powder is 550m 2 / kg.

[0065] In the present embodiment, the unit water consumption of limestone powder is 9Kg; Calcium carbonate content is 91%, and the flow ratio of limestone powder is 105%; Particle diameter is 50mm; The methylene blue value of limestone powder is 1.0.

[0066] In this embodiment, the apparent density of crushed stone is 2710kg m -3 , the bulk density of the crushed stone is 1570, the needle flake content of the crushed stone is 5%, the crushing value of the crushed stone is 10%, and the gradatio...

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Abstract

The invention discloses concrete for high-durability construction. The concrete is prepared from the following raw materials in parts by mass: 155-400 parts of cement, 110-60 parts of limestone powder, 20-80 parts of mineral powder, 780-735 parts of water sand, 1160-1150 parts of pebbles or 0 part of pebbles, 1010-980 parts of gravels or 0 part of gravels, and 160-155 parts of water. The specificsurface area of the limestone powder is 550-650m<2> / kg. According to the invention, the limestone powder with a certain specific surface area is adopted to improve the durability of the concrete, so that the frost resistance and chloride ion permeability resistance of the concrete are well improved, and the concrete with high durability is further formed.

Description

technical field [0001] The invention belongs to the technical field of construction materials, and in particular relates to concrete for high-durability construction. Background technique [0002] Studies have shown that limestone is not an inert admixture. After replacing fly ash in concrete, the workability of fresh concrete is significantly improved, the viscosity is reduced, and the strength of hardened concrete is slightly increased. The reason why stone powder replaces fly ash can reduce concrete is mainly because the water demand of stone powder is lower than that of fly ash. When the fineness is the same, this is related to the smooth surface structure of stone powder. As the fineness of stone powder increases, the difficulty and energy consumption of grinding stone powder rises sharply, and the economy decreases, and the water demand of stone powder increases, which is not good for the strength of concrete. [0003] The main reason why stone powder is used as a min...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B111/20
CPCC04B28/02C04B2111/20C04B2201/50C04B14/28C04B18/141C04B14/06C04B14/02C04B18/08
Inventor 杨勇
Owner 冀东海德堡(泾阳)水泥有限公司
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