高扬程泵送机制砂混凝土试验研究与应用
|
摘要
以C40高扬程泵送机制砂混凝土为对象,通过配合比优化设计与试验,研究了水胶比、砂率、粉煤灰掺量等对混凝土的工作性及力学性能的影响,并对混凝土的施工性能进行验证性分析。结果表明:水胶比为0.37、粉煤灰掺量为25%、砂率为42%时,配制的机制砂混凝土具有最优的工作性,28 d抗压强度达到52.8 MPa,电通量为964 C,符合设计要求。对现场浇筑的混凝土进行取样测试,工作性满足施工要求,泵送前的倒置坍落度筒排空时间在5 s以内,泵送后的倒置坍落度筒排空时间在5～10 s,具有良好的施工性能。
The article is based on the C40 high lift pumping manufactured sand concrete. The water-binder ratio,sand ratio and the content of fly ash on the workability and mechanical property of concrete was studied. The construction performance of concrete was also verified. The results show that the workability of manufactured sand concrete mixture is optimal when the waterbinder ratio is 0.37,the sand ratio is 42% and the content of fly ash is 25%. The compounding strength of concrete is 52.8 MPa and the electric flux is 964 C. The test results in site show that the slump and expansion of concrete mixture can meet the re-quirements of construction. The inverted slump cylinder emptying time of concrete mixture is less than 5 seconds before pumping and the time is between 5 ～10 seconds after pumping. In general,the manufactured sand concrete has good construction performance.
The article is based on the C40 high lift pumping manufactured sand concrete. The water-binder ratio,sand ratio and the content of fly ash on the workability and mechanical property of concrete was studied. The construction performance of concrete was also verified. The results show that the workability of manufactured sand concrete mixture is optimal when the waterbinder ratio is 0.37,the sand ratio is 42% and the content of fly ash is 25%. The compounding strength of concrete is 52.8 MPa and the electric flux is 964 C. The test results in site show that the slump and expansion of concrete mixture can meet the re-quirements of construction. The inverted slump cylinder emptying time of concrete mixture is less than 5 seconds before pumping and the time is between 5 ～10 seconds after pumping. In general,the manufactured sand concrete has good construction performance.
引文
[1]蔡基伟.石粉对机制砂混凝土性能的影响及机理研究[D].武汉:武汉理工大学,2006.
[2]王稷良.机制砂特性对混凝土性能的影响及机理研究[D].武汉:武汉理工大学,2008.
[3]王雨利,王稷良,周明凯,等.机制砂及石粉含量对混凝土抗冻性能的影响[J].建筑材料学报,2008,11(6):726-731.
[4]田建平,周明凯,蔡基伟.高强机制砂混凝土中石粉与粉煤灰的复合效应[J].武汉理工大学学报,2006,28(3):55-57.
[5]蒋正武,任启欣,吴建林,等.机制砂特性及其在混凝土中应用的相关问题研究[J].新型建筑材料,2010,37(11):1-4.
[6]李北星,周明凯,蔡基伟,等.机制砂中石粉对不同强度等级混凝土性能的影响研究[J].混凝土,2008(7):51-54.
[7]成立,黄绪泉,王小萍.C50机制砂高性能混凝土在构皮滩乌江大桥中的应用[J].混凝土,2007(1):55-58.
[8]孙存良,宁凯,郭瑞.高泵送机制砂高性能混凝土的研究与应用[J].公路,2014(12):169-171.
[9]周平,罗亨文,覃宗华.坝陵河大桥机制砂混凝土高塔泵送施工技术[C]//中国公路学会桥梁和结构工程分会.2009年全国桥梁学术会议论文集.贵阳:2009.
[10]刘登贤,桂根生,吴鑫,等.掺特细砂C30超高层泵送混凝土的制备及工程应用[J].新型建筑材料,2017,44(11):35-39.
[11]李北星,周明凯,田建平,等.石粉与粉煤灰对C60机制砂高性能混凝土性能的影响[J].建筑材料学报,2006,9(4):381-387.
[12]许强,王溯愿,谢行海,等.大掺量粉煤灰砼应用研究[J].粉煤灰综合利用,2002(4):16-18.
[13]彭旭.大掺量粉煤灰混凝土性能研究[D].重庆:重庆大学,2005.
[2]王稷良.机制砂特性对混凝土性能的影响及机理研究[D].武汉:武汉理工大学,2008.
[3]王雨利,王稷良,周明凯,等.机制砂及石粉含量对混凝土抗冻性能的影响[J].建筑材料学报,2008,11(6):726-731.
[4]田建平,周明凯,蔡基伟.高强机制砂混凝土中石粉与粉煤灰的复合效应[J].武汉理工大学学报,2006,28(3):55-57.
[5]蒋正武,任启欣,吴建林,等.机制砂特性及其在混凝土中应用的相关问题研究[J].新型建筑材料,2010,37(11):1-4.
[6]李北星,周明凯,蔡基伟,等.机制砂中石粉对不同强度等级混凝土性能的影响研究[J].混凝土,2008(7):51-54.
[7]成立,黄绪泉,王小萍.C50机制砂高性能混凝土在构皮滩乌江大桥中的应用[J].混凝土,2007(1):55-58.
[8]孙存良,宁凯,郭瑞.高泵送机制砂高性能混凝土的研究与应用[J].公路,2014(12):169-171.
[9]周平,罗亨文,覃宗华.坝陵河大桥机制砂混凝土高塔泵送施工技术[C]//中国公路学会桥梁和结构工程分会.2009年全国桥梁学术会议论文集.贵阳:2009.
[10]刘登贤,桂根生,吴鑫,等.掺特细砂C30超高层泵送混凝土的制备及工程应用[J].新型建筑材料,2017,44(11):35-39.
[11]李北星,周明凯,田建平,等.石粉与粉煤灰对C60机制砂高性能混凝土性能的影响[J].建筑材料学报,2006,9(4):381-387.
[12]许强,王溯愿,谢行海,等.大掺量粉煤灰砼应用研究[J].粉煤灰综合利用,2002(4):16-18.
[13]彭旭.大掺量粉煤灰混凝土性能研究[D].重庆:重庆大学,2005.