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Modified recycled coarse aggregate and method for preparing recycled concrete using modified recycled coarse aggregate

A technology of recycled coarse aggregate and recycled concrete, applied in the fields of recycled concrete and concrete, can solve the problems of low surface roughness of modified recycled coarse aggregate, low slump of recycled concrete, low dry shrinkage and creep, etc. , to achieve the effect of increasing strength, reducing water-binder ratio and improving performance

Inactive Publication Date: 2019-01-25
HEBEI CONSTR GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and to provide a modified recycled coarse aggregate and a method for preparing recycled concrete; the modified recycled coarse aggregate has low surface roughness, low porosity, and low water absorption. Low, high crushing index, the recycled concrete produced by it has low slump, high strength, high elastic modulus, low drying shrinkage and creep, stronger durability, stable quality, good mixture performance, and wider application range. Wider and wider, it can be applied to concrete pouring with strength grade less than or equal to C40; the application of the present invention saves resources, effectively reduces the generation of construction waste, and reduces the environmental pollution problems of ready-mixed concrete enterprises

Method used

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  • Modified recycled coarse aggregate and method for preparing recycled concrete using modified recycled coarse aggregate

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Embodiment 1

[0012] Embodiment 1, the modified recycled coarse aggregate of this embodiment is made by the following method: use a sand maker to crush the hardened waste concrete into recycled coarse aggregates of 5-10mm and 10-20mm . Soak the two kinds of regenerated coarse aggregate in the waste mud slurry with a solid content of 5% produced by the washing mixer truck and the mixing station, and circulate and soak for more than 24 hours according to the requirement of stirring for at least 5 minutes within 1 hour. Lay flat and sieve to prevent aggregates wrapped in waste mud liquid from sticking to each other to form large-volume cement blocks, and cool the under-sieve until the surface is dry. Mix the treated modified recycled coarse aggregate with a particle size of 5-10mm and the modified recycled coarse aggregate with a particle size of 10-20mm in a ratio of 40%:60%, and mix to form a particle size of 5-20mm Modified recycled coarse aggregate. The method for preparing recycled conc...

Embodiment 2

[0015] Embodiment 2, the other features of the modified regenerated coarse aggregate of this embodiment are the same as those of Embodiment 1, except that the solid content of the waste mud slurry is 9%, and the modified regenerated coarse aggregate with a particle size of 5-10mm after treatment The mixing ratio of raw material and modified recycled coarse aggregate with a particle size of 10-20mm is 45%: 55%. The other characteristics of the method for preparing recycled concrete in this embodiment are the same as those in Example 1, except that the volume ratio of the modified recycled coarse aggregate equal volume to replace the natural coarse aggregate is 25; the mixed coarse aggregate accounts for 45.79%, and the natural sand accounts for 32.45% , cement accounted for 10.00, fly ash accounted for 2.75, blast furnace slag powder accounted for 4.08, water reducing agent accounted for 0.31, and drinking water accounted for 7.96.

Embodiment 3

[0016] Embodiment 3, other features of the modified regenerated coarse aggregate of this embodiment are the same as those of Embodiment 1, except that the solid content of the waste mud slurry is 1%, and the modified regenerated coarse aggregate with a particle size of 5-10mm after treatment The mixing ratio of raw material and modified recycled coarse aggregate with a particle size of 10-20mm is 35%: 65%. Other characteristics of the method for preparing recycled concrete in this embodiment are the same as those in Example 1, except that the volume ratio of the modified recycled coarse aggregate equal volume to replace the natural coarse aggregate is 5; the mixed coarse aggregate accounts for 48.61, and the natural sand accounts for 30.56 , cement accounted for 9.8, fly ash accounted for 2.65, blast furnace slag powder accounted for 3.92, water reducing agent accounted for 0.29, and drinking water accounted for 7.64.

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Abstract

The invention discloses modified recycled coarse aggregate. The recycled coarse aggregate with the granulometric class of 5-10 mm and 10-20 mm are soaked in waste slurry with solid content of 1%-9% and then mixed evenly at the ratio of (35%-45%):(55%-65%). According to the method for preparing recycled concrete using the modified recycled coarse aggregate, the modified recycled coarse aggregate with the volume ratio of (5-25%) replaces natural coarse aggregate with the same volume, and then 45.79-48.61 mixed coarse aggregate, 30.56-32.45 natural sand, 9.80-10.20 cement, 2.65-2.75 fly ash and 3.92-4.08 blast furnace slag powder, 0.29-0.31 water reducer and 7.64-7.96 drinking water are stirred and mixed to prepare the modified recycled coarse aggregate. The modified recycled coarse aggregatehas low surface roughness, low porosity, low water absorption rate and high crushing index, and produced recycled concrete has low collapsibility, high modulus of elasticity, and low dry shrinkage rate and creep deformation.

Description

technical field [0001] The invention belongs to the concrete category in the field of building materials, and relates to a modified recycled coarse aggregate and the recycled concrete made of the modified recycled coarse aggregate, which is suitable for pouring concrete with a strength grade less than or equal to C40. Background technique [0002] With the rapid development of the economy, in many big cities in my country, the waste generated by the construction industry has become a public hazard. These wastes not only cause serious damage to the environment, but also compete with human beings for living space, seriously affecting the sustainable development of the country. Therefore, it is imminent to develop new technologies to reduce, recycle and utilize construction waste. [0003] Construction waste is mainly produced during the demolition of old buildings and the construction of new buildings. Therefore, to reduce buildings, it is necessary to adopt advanced manageme...

Claims

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Application Information

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IPC IPC(8): C04B20/02C04B28/00
CPCC04B20/02C04B28/00C04B2201/20C04B2201/50C04B18/167C04B18/08C04B14/06C04B18/141C04B2103/302
Inventor 丁丽芳姚志玉张萌冯冀平张军会姜山张思雨杨彩虹孙志彬郭万峰
Owner HEBEI CONSTR GRP CO LTD
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