粉煤灰对LC15全轻混凝土性能及浆体流变性影响研究
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摘要
研究了不同粉煤灰掺量(10%～40%)对LC15级全轻混凝土工作性、干表观密度、抗压强度及其浆体流变性能的影响。试验结果表明:粉煤灰可有效提高轻骨料混凝土的工作性,但在低掺量时易引起轻骨料混凝土黏聚性及扩展度的下降;掺入粉煤灰可显著降低轻骨料混凝土的干表观密度,当掺量超过10%时会降低其28 d抗压强度,但在20%掺量条件下,56 d抗压强度保持与基准组相当;掺入粉煤灰使轻骨料混凝土浆体屈服应力及塑性黏度下降,其中,塑性黏度下降可能是造成轻骨料混凝土黏聚性下降的原因之一。
The workability, drying apparent density, compressive strength and paste rheological properties of LC15 lightweight concrete incorporating 10% ～40% fly ash are investigated. The results shows that the addition of fly ash can effectively improve the workability of lightweight concrete, however, the cohesiveness and slump flow of lightweight concrete may decrease at a lower fly ash content. In addition, the drying apparent density of the lightweight concrete decreases becasuse of the addition of fly ash. When the dosage of fly ash exceeds 10%, its 28 d compressive strength decreases, but the 56 d compressive strength of sample with 20% fly ash is comparable to that of the reference group.Moreover, the addition of fly ash decreases the yield stress of pastes in lightweight concrete and the decreasing plastic viscosity may be responsible for the decreasing cohesiveness of lightweight concrete.
The workability, drying apparent density, compressive strength and paste rheological properties of LC15 lightweight concrete incorporating 10% ～40% fly ash are investigated. The results shows that the addition of fly ash can effectively improve the workability of lightweight concrete, however, the cohesiveness and slump flow of lightweight concrete may decrease at a lower fly ash content. In addition, the drying apparent density of the lightweight concrete decreases becasuse of the addition of fly ash. When the dosage of fly ash exceeds 10%, its 28 d compressive strength decreases, but the 56 d compressive strength of sample with 20% fly ash is comparable to that of the reference group.Moreover, the addition of fly ash decreases the yield stress of pastes in lightweight concrete and the decreasing plastic viscosity may be responsible for the decreasing cohesiveness of lightweight concrete.
引文
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[2]赵霄龙.新农村:建设·建材·建言(之一)就地取材新农村建材本土资源化[J].建设科技,2006(11):15.
[3]张路锁,常明华.河北省页岩气地质条件评价[J].中国煤炭地质,2014(3):23-26.
[4]徐凤文,李文学,王秘新,等.河北省承德市墙体材料页岩的开发利用[J].科技与企业,2012(11):176-176.
[5]毛锡双.超轻页岩陶粒的制备及焙烧机理研究[D].南宁:广西大学,2006.
[6]王琪,石桂菊,李平,等.利用页岩矿烧制陶粒的试验研究[J].新疆有色金属,2009,32(2):39-40.
[7]苑金生.轻骨料混凝土的应用及效益分析[J].建材发展导向,1996(1):29-30.
[8]付达新.轻骨料混凝土的研究现状与展望[J].中国建材科技,2009(6):47-51.
[9]莫鲁.国外轻混凝土结构应用概况[J].建筑结构,1979(6):43-47.
[10]焦立颖.钢结构楼板泵送轻骨料混凝土优化配比研究[J].混凝土与水泥制品,2016(10):56-61.
[11]何廷树,王振军,伍勇华,等.自密实轻骨料混凝土工作性能的研究[J].西安科技大学学报,2004,24(4):422-425.
[12]张前江,洪丽,高鹏,等.聚合物改性再生骨料混凝土力学性能试验研究[J].混凝土与水泥制品,2018(6):89-92.
[13]梁咏宁,陈永波,季韬,等.陶粒类型对轻骨料混凝土自收缩的影响[J].混凝土与水泥制品,2011(9):4-8.
[14]王振军,张思宇,薛军鹏,等.自密实轻骨料混凝土耐久性能研究[J].南昌大学学报:工科版,2006,28(2):197-200.
[15]王沁芳,王智,张朝辉.轻集料混凝土空心砌块热工性能及其改善措施[J].新型建筑材料,2006(6):58-60.
[16]孙耀峰.基于粉煤灰减水效应的混凝土强度试验研究[D].兰州:兰州理工大学,2011.
[17]黄学良,臧庆珊.减水型粉煤灰减水机理的探讨[J].粉煤灰,1995(2):19-23.
[18]龙湘敏,谢友均,刘宝举.超细粉煤灰在低水胶比浆体中的密实填充作用[J].混凝土,2002(3):38-40.
[19]管文,谈慕华,俞海勇,等.粉煤灰—水泥浆体的流变性能[J].建筑材料学报,2001(4):339-345.
[20]吴学礼,朱蓓蓉,陈孟.上海地区不同商品粉煤灰水泥浆体的流变性能[J].水泥,2002(8):5-7.