EFFECTS OF RICE HUSK ASH AND METAKAOLIN ADMIXTURE ON THE PROPERTIES OF RECYCLED CONCRETE

CAO Fubo; WEI Ziyang; WANG Chenxia; LIU Lijie; NI Lei; TIAN Jinliang

doi:10.13204/j.gyjzG20031602

Volume 51 Issue 4

Aug. 2021

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CAO Fubo, WEI Ziyang, WANG Chenxia, LIU Lijie, NI Lei, TIAN Jinliang. EFFECTS OF RICE HUSK ASH AND METAKAOLIN ADMIXTURE ON THE PROPERTIES OF RECYCLED CONCRETE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(4): 167-171. doi: 10.13204/j.gyjzG20031602

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EFFECTS OF RICE HUSK ASH AND METAKAOLIN ADMIXTURE ON THE PROPERTIES OF RECYCLED CONCRETE

doi: 10.13204/j.gyjzG20031602

1. School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Baotou Construction Engineering Quality Test Center, Baotou 014030, China;
3. Baotou Urban Construction Group Co., Ltd., Baotou 014020, China

Received Date: 2020-03-16
Available Online: 2021-08-19

Abstract

Abstract

Both rice husk ash and metakaolin are pozzolanic active materials. In the experiment,chemical slurry of rice husk ash and metakaolin were used to strengthen the recycled coarse aggregate. The effects of chemical slurry on the properties of recycled coarse aggregate and the properties of recycled concrete prepared were tested. Studies showed that the properties of recycled coarse aggregate and recycled concrete could be optimized by 5 different ratios of chemical slurry. When the mixing ratio of rice husk ash and metakaolin was 3:1, the crushing index of recycled coarse aggregate decreased by 1.5%, the void ratio decreased by 2.4%,the apparent density and bulk density improved,the water absorption increased by 2.2%.Compared with the reference group, the compressive strength of recycled concrete prepared with reinforced aggregate increased by 8.6%, the flexural strength increased by 4.4% and the wear resistance was better.
- composite admixture,
- percentage selection,
- active material,
- chemical strengthning,
- recycled coarse aggregate

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