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A kind of low-heat recycled large aggregate concrete and preparation method thereof

A technology for concrete and aggregate, which is applied in the field of low-heat recycled large-aggregate concrete and its preparation, and achieves the effects of simplifying construction steps, increasing activity, and improving strength

Active Publication Date: 2021-08-03
广西壮族自治区水利科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the recycled aggregate involved in the prior art is often below 40mm, and there is no relevant report on the recycled aggregate concrete with a particle size exceeding 40mm in the prior art

Method used

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  • A kind of low-heat recycled large aggregate concrete and preparation method thereof
  • A kind of low-heat recycled large aggregate concrete and preparation method thereof
  • A kind of low-heat recycled large aggregate concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A kind of recycled large aggregate concrete, first prepare self-compacting mortar: take 365kg of ordinary Portland cement, 5kg of metakaolin, 1250kg of medium sand, 165kg of water, 2.5kg of water reducing agent, and 35kg of expansion agent. Among them, metakaolin is obtained by calcining kaolin at 800°C for 5 hours, the water reducer is polycarboxylate high-efficiency water reducer, and the expansion agent is UEA expansion agent. Then use mortar to pour piled 150mm-300mm recycled crushed stones to form recycled large aggregate concrete.

Embodiment 2

[0027] A kind of recycled large aggregate concrete, first prepare self-compacting mortar: take 364kg of ordinary Portland cement, 6kg of metakaolin, 1250kg of medium sand, 160kg of water, 2kg of water reducing agent, and 35kg of expansion agent. Among them, metakaolin is obtained by calcining kaolin at 900°C for 4 hours, the water reducer is polycarboxylate high-efficiency water reducer, and the expansion agent is UEA expansion agent. Then use mortar to pour piled 150mm-300mm recycled crushed stones to form recycled large aggregate concrete. Example 3

Embodiment 3

[0028] A kind of recycled large aggregate concrete, first prepare self-compacting mortar, take ordinary portland cement 378kg, metakaolin 7kg, medium sand 1200kg, water 180kg, water reducer 3kg, expansion agent 30kg. Among them, metakaolin is obtained by calcining kaolin at 600°C for 4 hours, the water reducer is polycarboxylate high-efficiency water reducer, and the expansion agent is UEA expansion agent. Then use mortar to pour piled 150mm-300mm recycled crushed stones to form recycled large aggregate concrete.

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Abstract

The invention discloses a low-heat recycled large aggregate concrete and a preparation method thereof. The regenerated large aggregate concrete is mainly prepared from regenerated crushed stones and self-compacting mortar; the particle size of the regenerated crushed stones is 150mm-300mm, and the self-compacting mortar is composed of 360-400 parts of ordinary portland cement , 1200‑1350 parts of medium sand, 5‑8 parts of metakaolin, 160‑180 parts of water, 2‑3 parts of water reducer and 30‑40 parts of expansion agent. The invention can use regenerated stones or pebbles with a particle size of 150mm-300mm to prepare large aggregate concrete, which greatly reduces the amount of concrete used, saves about 40% of concrete per square, and greatly reduces construction costs. The homemade self-compacting mortar has the function of compensating for shrinkage or micro-expansion, and has a lower heat of hydration. After use, the lower cement content in unilateral concrete can effectively solve the common problem of hydration temperature rise in mass concrete. Generally, it can be obtained About 45% of conventional concrete; and the construction steps are simplified, the construction efficiency is improved, the construction cost is reduced, and the construction process is greatly accelerated.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a low-heat recycled large aggregate concrete and a preparation method thereof. Background technique [0002] In recent years, with the acceleration of urbanization, the amount of urban construction waste has also increased. However, the disposal methods of construction waste are often methods such as burial and incineration, which consume a lot of energy and are extremely unfavorable to the environment. Therefore, after the construction waste is crushed and processed to form large-sized recycled aggregates, the preparation of recycled concrete is a treatment method that meets the requirements of today's environmentally friendly society, and the use of recycled concrete reduces the demand for natural aggregates and greatly saves cost, there are many benefits. [0003] Aiming at recycled aggregate and recycled concrete, many domestic scholars have conducted a lot of re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
Inventor 陈建国李林周脉席郭晋川刘鲁强彭华娟周立新王忠民甘福吴光军黄小兵陈树亮杨建坤吴俣萍韦美富梁晓宁黄华贵
Owner 广西壮族自治区水利科学研究院