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Nano-metakaolin recycled concrete and preparation method thereof
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A technology of recycled concrete and metakaolin, applied in the field of concrete, can solve the problems of high cost and limited application prospects, and achieve the effects of improved ductility, good application prospects and low cost
Inactive Publication Date: 2021-06-15
HEBEI INSTITUTE OF ARCHITECTURE AND CIVIL ENGINEERING
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Problems solved by technology
Although the various nanomaterials usually added in the current research can improve the working performance, mechanical properties and durability of recycled concrete, most of them are expensive, so the application prospects are limited.
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Embodiment 1
[0027] Embodiment 1: a kind of nanometer metakaolin regeneration concrete, its raw material comprises the component of following parts by weight:
[0034] The preparation method of recycled coarse aggregate is as follows:
[0035] Step 1: After the recycled coarse aggregate is manually crushed into large pieces, the jaw crusher is used for further crushing, so that the crushed aggregate is roughly 31mm or less.
[0036] Step 2: After crushing, pass through a 4.75mm square hole sieve first, discard the particles smaller than 4.75mm directly, choose a square hole sieve of 4.75mm, 9.5mm, 19.0mm, 31.5mm and a bottom sieve each, and carry out crushing on the crushed aggregate. Fine sieve, the sieved aggregate particle size ranges are 5 ~ 10mm, 10 ~ 20mm, 20 ...
Embodiment 2
[0041] Embodiment 2: A nano-metakaolin recycled concrete. The difference from the embodiment 1 is that the weight part of cement is 354.35 parts, and the weight part of nano-metakaolin is 18.65 parts.
Embodiment 3
[0042] Embodiment 3: a kind of nano metakaolin recycled concrete, the difference with embodiment 1 is that the parts by weight of natural coarse aggregate are 601.5 parts, the parts by weight of recycled coarse aggregate are 601.5 parts, and the parts by weight of water The number is 215 copies.
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Abstract
The invention relates to nano-metakaolin recycled concrete and a preparation method thereof. The nano-metakaolin recycled concrete is prepared from the following raw material components in parts by weight: 11 to 19 parts of nano-metakaolin, 361 to 1203 parts of recycled coarse aggregate, 601 to 842 parts of natural coarse aggregate, 354 to 373 parts of cement, 619 parts of sand and 211 to 225 parts of water. The recycled concrete has the advantages of high compressive strength, high breaking strength, high splitting tensile strength and high toughness, is low in raw material cost, and lays a foundation for wide application of the recycled concrete.
Description
technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a nano metakaolin recycled concrete and a preparation method thereof. Background technique [0002] With the rapid development of society, some basic building facilities or old and dangerous buildings are gradually eliminated. During the demolition and reconstruction of these concrete structures, immeasurable construction waste will be generated, most of which are cement-based solid waste. To deal with so much construction waste, the traditional way to deal with it is to landfill or pile up everywhere. Construction waste such as waste concrete is different from domestic waste. It is difficult to digest itself through this traditional treatment method, and the ecological environment and the surrounding living environment are greatly affected. [0003] In order to solve the waste concrete formed by the demolition of old buildings and reduce pollution and waste, recycl...
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