粉煤灰改性磷酸镁水泥试验研究
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摘要
分析了水灰比、粉煤灰掺量对MPC试件强度的影响。净浆试件最优水灰比为0.13时,1 d抗折、抗压强度分别为8.0、30.2 MPa,28 d抗折、抗压强度分别达到10.3、53.1 MPa,达到P·O 52.5R的强度要求,具有明显的早强、高强特性。改性试件中粉煤灰的最优掺量为10%,最优水灰比为0.17。改性试件1 d抗折、抗压强度分别为5.3、25.9 MPa,达到P·O 42.5R的强度要求,早强特性明显。电镜扫描形貌表明,产物中MKP晶体排列致密;但粉煤灰将破坏晶体排列,导致强度降低。
The effect of water-cement ratio and the optimal content of fly ash on the strength of the specimen was analyzed.When the water-cement ratio of the specimen is 0.13,the strength of the specimen reaches the requirement of P·O 52.5 R.The 1 d flexural strength and compressive strength of MPC specimens were 8.0 MPa and 30.2 MPa respectively.The 28 d flexural and compressive strength of MPC specimens were 10.3 MPa and 53.1 MPa respectively.The characteristics of early strength and high strength of MPC specimen are obvious.The influence of fly ash content on the specimen was analyzed.The optimal content of fly ash is 10%,the corresponding water-cement ratio is 0.17,and the strength of the specimen reaches the requirement of P·O 42.5 R.Fly ash destroys the arrangement of the MKP crystals,resulting in a decrease in the strength of the specimen.The 1 d flexural strength and compressive strength of modified specimens were5.3 MPa and 25.9 MPa respectively.Electron microscope scanning morphology shows that,the density of MKP crystals in the specimen is densely arranged.However,fly ash will destroy the crystal arrangement,resulting in reduced strength.
The effect of water-cement ratio and the optimal content of fly ash on the strength of the specimen was analyzed.When the water-cement ratio of the specimen is 0.13,the strength of the specimen reaches the requirement of P·O 52.5 R.The 1 d flexural strength and compressive strength of MPC specimens were 8.0 MPa and 30.2 MPa respectively.The 28 d flexural and compressive strength of MPC specimens were 10.3 MPa and 53.1 MPa respectively.The characteristics of early strength and high strength of MPC specimen are obvious.The influence of fly ash content on the specimen was analyzed.The optimal content of fly ash is 10%,the corresponding water-cement ratio is 0.17,and the strength of the specimen reaches the requirement of P·O 42.5 R.Fly ash destroys the arrangement of the MKP crystals,resulting in a decrease in the strength of the specimen.The 1 d flexural strength and compressive strength of modified specimens were5.3 MPa and 25.9 MPa respectively.Electron microscope scanning morphology shows that,the density of MKP crystals in the specimen is densely arranged.However,fly ash will destroy the crystal arrangement,resulting in reduced strength.
引文
[1]胡曙光.先进水泥基复合材料[M].北京:科学出版社,2009.
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[3]温金保,唐修生,黄国泓,等.磷酸镁水泥快速修补材料的性能试验[J].水利水电科技进展,2017,37(2):82-87.
[4]戴丰乐,汪宏涛,丁建华,等.氧化镁与磷酸盐质量比对磷酸镁水泥水化历程的影响[J].硅酸盐学报,2017,45(8):1144-1152.
[5]李国新,仝万亮,张歌,等.粉煤灰和矿粉对磷酸镁水泥性能的影响[J].硅酸盐通报,2016,35(2):352-357.
[6]水泥胶砂强度检验方法(IOS法):GB/T 17671—1999[S].北京:中国标准出版社,1999.
[7]陈妤,李十泉,陈蓓,等.磷酸镁水泥净浆及CFRP切丝改性试验研究[J].混凝土与水泥制品,2015(9):55-59.
[8]路毅.低温下粉煤灰改性磷酸镁水泥性能研究[J].硅酸盐通报,2015,34(12):3596-3600.
[9]林玮,孙伟,李宗津.磷酸镁水泥中的粉煤灰效应研究[J].建筑材料学报,2010(12):716-721.
[10]张思宇,施惠生,黄少文.粉煤灰掺量对磷酸镁水泥基复合材料力学性能影响[J].南昌大学学报(工科版),2009,31(1):80-83.
[2]孟芹,廖梓珺,李云涛.磷酸镁水泥的研究现状及发展趋势[J].硅酸盐通报,2017,36(4):1245-1253.
[3]温金保,唐修生,黄国泓,等.磷酸镁水泥快速修补材料的性能试验[J].水利水电科技进展,2017,37(2):82-87.
[4]戴丰乐,汪宏涛,丁建华,等.氧化镁与磷酸盐质量比对磷酸镁水泥水化历程的影响[J].硅酸盐学报,2017,45(8):1144-1152.
[5]李国新,仝万亮,张歌,等.粉煤灰和矿粉对磷酸镁水泥性能的影响[J].硅酸盐通报,2016,35(2):352-357.
[6]水泥胶砂强度检验方法(IOS法):GB/T 17671—1999[S].北京:中国标准出版社,1999.
[7]陈妤,李十泉,陈蓓,等.磷酸镁水泥净浆及CFRP切丝改性试验研究[J].混凝土与水泥制品,2015(9):55-59.
[8]路毅.低温下粉煤灰改性磷酸镁水泥性能研究[J].硅酸盐通报,2015,34(12):3596-3600.
[9]林玮,孙伟,李宗津.磷酸镁水泥中的粉煤灰效应研究[J].建筑材料学报,2010(12):716-721.
[10]张思宇,施惠生,黄少文.粉煤灰掺量对磷酸镁水泥基复合材料力学性能影响[J].南昌大学学报(工科版),2009,31(1):80-83.