Preparation method of sea pebble, sea sand, seawater and regenerated micro-powder concrete

A technology for regenerating micropowder and sea pebbles, which is applied in the field of preparation of regenerated micropowder concrete from sea pebble, sea sand and seawater, can solve the problems of limiting the application of recycled concrete, low concrete tensile strength, and large shrinkage of concrete, and achieves green sustainable development, The effect of promoting ecological and economic benefits, increasing tensile strength and toughness

Inactive Publication Date: 2020-12-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although many new materials and technologies are used to replace and improve the raw materials of traditional concrete, the problems of low tensile strength, high brittleness and easy cracking of concrete have not been solved.
Recycled fine powder and recycled crushed stone have higher water absorption than traditional raw materials, resulting in greater shrinkage and cracking of concrete, which limits the application of recycled concrete

Method used

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  • Preparation method of sea pebble, sea sand, seawater and regenerated micro-powder concrete
  • Preparation method of sea pebble, sea sand, seawater and regenerated micro-powder concrete
  • Preparation method of sea pebble, sea sand, seawater and regenerated micro-powder concrete

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Effect test

Embodiment 1

[0069] Prepare sea pebble sea sand seawater recycled micropowder concrete sample 1#, by weight percentage, including the following components: cement 10.8%; recycled micropowder 2%; sea pebble 27.5%; recycled crushed stone 27.5%; sea sand 25%; %; plant fiber 1%; water reducing agent 0%. See Table 1 for specific ratios.

[0070] Among them, the cement is P.O.42.5 ordinary Portland cement; the recycled micropowder is the particles with a particle size of less than 75 μm and an activity index greater than 70% obtained after crushing, removing impurities, and grinding of waste concrete; sea pebbles are 5-25mm continuous graded sea Pebbles; recycled crushed stones are 5-25mm continuous graded recycled crushed stones obtained from waste concrete after crushing, impurity removal, and screening; sea sand is sea sand with a fineness modulus of 2.7; plant fibers are jute fibers with a length of 10 mm.

[0071] The plant fiber and seawater are evenly mixed according to the proportion to...

Embodiment 2

[0074] Prepare sea pebble sea sand seawater recycled micropowder concrete sample 2#, by weight percentage, including the following components: cement 9.8%; recycled micropowder 2%; sea pebble 27.5%; recycled crushed stone 27.5%; sea sand 25%; %; plant fiber 2%; water reducing agent 0%. See Table 1 for specific ratios.

[0075] Among them, the cement is P.O.42.5 ordinary Portland cement; the recycled micropowder is the particles with a particle size of less than 75 μm and an activity index greater than 70% obtained after crushing, removing impurities, and grinding of waste concrete; sea pebbles are 5-25mm continuous graded sea Pebbles; recycled crushed stones are 5-25mm continuous graded recycled crushed stones obtained from waste concrete after crushing, impurity removal, and screening; sea sand is sea sand with a fineness modulus of 2.7; plant fibers are jute fibers with a length of 10 mm.

[0076] The plant fiber and seawater are evenly mixed according to the proportion to ...

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Abstract

The invention provides sea pebble, sea sand, seawater and regenerated micro-powder concrete which comprises the following components in percentage by weight: 7-25% of cement; 0-7.5% of regenerated micro-powder; 0-55% of sea pebble; 0-55% of regenerated broken stone; 20-25% of sea sand; 5-7.5% of seawater; 0-2% of plant fibers; and 0-0.2% of a water reducing agent. The invention further provides apreparation method of the sea pebble, sea sand, seawater and regenerated micro-powder concrete. According to the preparation method of the sea pebble, sea sand, seawater and regenerated micro-powder concrete provided by the invention, resource utilization is carried out on the sea pebbles, the regenerated gravels, the sea sand, the seawater and the regenerated micro-powder, so that the problems ofresource consumption, environmental pollution and the like in concrete production and after scrapping are solved; and the tensile strength and toughness of the sea pebble, sea sand, seawater and regenerated micro-powder concrete are improved through the plant fibers.

Description

technical field [0001] The invention belongs to the technical field of green and sustainable development of concrete, and relates to a preparation method of sea pebble, sea sand and seawater recycled micropowder concrete. Background technique [0002] Traditional concrete is mainly composed of four raw materials: cement, crushed stone, river sand and fresh water. It is currently the most used engineering material, but it has become more and more unsustainable in the production process. Producing 1 ton of cement requires 2 tons of raw materials and produces 1 ton of CO 2 , will consume a lot of resources and cause the greenhouse effect. Long-term gravel and river sand mining has caused problems such as ecological degradation, environmental pollution, and river bank collapse. Therefore, most parts of the country have issued policies and regulations that restrict or even prohibit mining, resulting in resource shortages and rising costs. For example, in April 2016, the price o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50
Inventor 肖建庄李志卫郝潞岑
Owner TONGJI UNIV
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