摘要
以0.26和0.28作为活性粉末混凝土的基础水胶比,用再生细集料全部取代石英砂,研究分维值D和20%、25%、30%粉煤灰掺量对RPC抗压强度、抗折强度的影响,并观察RPC的微观形貌。结果表明:随级配分维值上升,RPC流动度下降。级配分维值对RPC抗压强度、抗折强度有很大影响;标准养护下早期抗压/抗折强度会呈现先下降再上升的趋势,后期强度持续上升;常温养护下随级配分维值增加,抗压/抗折强度在不同的龄期均呈现上升趋势;各组RPC强度随粉煤灰掺量增加而不断下降;随着粉煤灰掺量增多,RPC水化产物基本相同,但内部微观结构呈现密实—疏松的变化趋势。
With a water-cement ratio of 0.26 and 0.28 as the base of active powder concrete,recycled fine aggregate replaced quartz sand.The effects of dimension value D and 20%,25%,30%fly ash content on the compressive and folding strength of RPC were studied and its microscopic morphology observed.Results:RPC flow degree decreases with increasing graded dimension.The graded dimension value greatly influences RPC’s compressive and folding strength.Under standard curing,early compressive and folding strength decreases while later strength rises.Under normal temperature maintenance,compressive and folding strength at different ages increase with increasing graded dimension;With increasing fly ash,RPC hydration products are basically the same,but the internal microstructure shows a dense-loose trend.
作者
文安飞
张政
霍志强
努尔麦麦提·阿卜力米提
杨征勋
WEN Anfei;ZHANG Zheng;HUO Zhiqiang;Nuermaimaiti·ABULIMITI;YANG Zhengxun(School of Traffic&Logistics Engineering,Xinjiang Agricultural University,Urumqi 830000,China;Sichuan Vocational and Technical College of communications,Chengdu 611130,China;Chengdu University of Technology,Chengdu 611130,China;Sichuan Province Transportation Green and Low-carbon Building Materials Engineering Technology Research Center,Chengdu 611130,China)
出处
《粉煤灰综合利用》
CAS
2024年第5期17-21,共5页
Fly Ash Comprehensive Utilization
基金
四川省交通运输厅科技项目(2018-C-03)。
关键词
再生细集料
RPC
分形理论
粉煤灰
力学性能
recycled fine aggregate
rpc
fractal theory
fly ash
mechanical property
