Abstract
Using straw powder (rice husk ash), fly ash, silicon powder and other three admixtures to prepare concrete can improve the ecological environment and promote the reuse of agricultural and industrial wastes. In this paper, 9 groups of freeze-thaw specimens and 9 groups of thermal conductivity specimens of green and environment-friendly three admixture-blended concrete were prepared with corn, wheat and rice husk powder, replacing cement with straw powder by 6% and 8% respectively and replacing cement with fly ash by 20% and silica fume by 10%. The test results show that the mass loss rate of the concrete ranges from 0.8% to 1.4% and from 3.5% to 4.4% after 25 and 50 freeze-thaw cycles, respectively. The thermal conductivity of the concrete falls within the range of 0.2901 w/(m· K)-0.5834 w/(m·K), which is suitable for the existing building reconstruction and new construction projects in cold and severe cold areas.
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