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A kind of natural volcanic ash green high performance concrete

A high-performance concrete and natural pozzolan technology, applied in the field of natural pozzolanic green high-performance concrete, can solve the problems of poor compactness and poor frost resistance, and achieve the effect of improving compactness, improving hydration activity and good integrity

Active Publication Date: 2021-04-30
CHINA ROAD & BRIDGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects in the prior art, the present invention provides a natural volcanic ash green high-performance concrete, which can use a large number of regional natural materials, natural volcanic ash to prepare green high-performance concrete, and overcomes the poor compactness and frost resistance of ordinary natural volcanic ash concrete. Disadvantages of bad sex

Method used

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  • A kind of natural volcanic ash green high performance concrete
  • A kind of natural volcanic ash green high performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0041] A natural volcanic ash green high performance concrete,

[0042] According to the formula shown in Table 1, take the following raw materials of corresponding weight: Portland cement, modified natural pozzolan, modified ultrafine fly ash, antifreeze functional materials, river sand, machine-made sand, gravel, water , tested by mixing and forming test blocks for compressive strength, electric flux and frost resistance.

[0043] The modified natural pozzolan is modified by the following methods:

[0044] First, the sun-dried natural volcanic ash with a mass fraction of 70% is ground by grinding equipment until the specific surface area is greater than 300m 2 / kg, then add 19% mass fraction of sun-dried natural pozzolan, 10% mass fraction slag powder and 1% ethylene glycol, and mix and grind until the specific surface area is greater than 450m 2 / kg;

[0045] The modified superfine fly ash is modified by the following methods:

[0046] Put 99 parts by weight of fly ash ...

Embodiment 4

[0049] The antifreeze functional material used in Example 4 is a mixture of 70 parts by weight of antifreeze alloy powder and 30 parts by weight of hydrophobic agent.

Embodiment 5

[0050] The antifreeze functional material used in Example 5 is a mixture of 60 parts by weight of antifreeze alloy powder and 40 parts by weight of hydrophobic agent.

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Abstract

The invention relates to a natural volcanic ash green high-performance concrete, which belongs to the technical field of green concrete and comprises the following components in parts by weight: 300-350 parts of Portland cement, 80-120 parts of modified natural volcanic ash, and modified superfine powder 20-40 parts of coal ash, 15-25 parts of antifreeze functional materials, 400-500 parts of river sand, 300-400 parts of machine-made sand, 900-1000 parts of gravel, 150-165 parts of water, 6-6.5 parts of water reducer . The invention can use a large number of regional natural materials and natural volcanic ash to prepare green high-performance concrete. By modifying the natural volcanic ash and adding modified ultra-fine fly ash, the disadvantage of poor compactness of ordinary natural volcanic ash concrete is overcome. By adding antifreeze function material, which overcomes the disadvantages of poor frost resistance of ordinary natural pozzolan concrete.

Description

technical field [0001] The invention belongs to the technical field of green high-performance concrete, and in particular relates to a natural volcanic ash green high-performance concrete. Background technique [0002] With the advancement of domestic civil engineering, water conservancy, transportation and other infrastructure construction, the global consumption of concrete, the largest civil engineering material, has reached 5 billion cubic meters. Adding fly ash, slag powder, silica fume and other mineral admixtures to concrete can Improving the workability of concrete, delaying the heat release rate of hydration, reducing concrete cracking, and improving concrete durability are one of the key technologies to achieve high-performance concrete. However, due to developed industries, some countries or regions lack traditional mineral admixtures. If they insist on using traditional mineral admixtures, they need to be transported over long distances. The cost is high and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/02
CPCC04B20/023C04B20/026C04B28/04C04B2201/50C04B14/14C04B18/08C04B14/068C04B22/002C04B24/24C04B14/02C04B14/34C04B24/42C04B18/141C04B24/02
Inventor 杜飞李志强鞠秀颖梁宇钒张朝贵
Owner CHINA ROAD & BRIDGE