减水剂与石灰石粉复合胶凝材料的适应性研究
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摘要
针对石灰石粉在掺合料混凝土中的应用所产生的外加剂与胶凝体系的适应性问题,采用饱和点和流动度的方法比较了减水剂与不同复合胶凝材料(石灰石粉-粉煤灰、石灰石粉-矿渣、石灰石粉-硅灰)的适应性影响规律。试验结果表明:不同复合胶凝材料组成的适应性存在显著差异,石灰石粉的掺入能够降低聚羧酸高效减水剂的饱和点;粉煤灰和矿渣的掺入对改善聚羧酸高效减水剂与石灰石粉-水泥胶凝体系的适应性有利;硅灰的掺入使得聚羧酸高效减水剂与石灰石粉-水泥胶凝体系的适应性变差;石灰石粉-粉煤灰的掺入,混凝土的早期强度降低,但是混凝土的后期强度得到提高。
Aiming at the compatibility of water-reducer and cementitious system in admixture concrete after mixing limestone powder,comparing the compatibility of water-reducer and different cementitious system( limestone powder-fly ash,limestone powder-slag,limestone powder-silica fume) through saturation point and fluidity. Result shows that remarkable difference existing between the compatibility of water-reducer and different cementitious system,mixing limestone powder can reduce the saturation point of polycarboxylic series super plasticizer; mixing fly ash and slag will improve the compatibility of polycarboxylic series super plasticizer and cementitious system mixing limestone powder; mixing silica fume will reduce the compatibility of polycarboxylic series super plasticizer and cementitious system mixing limestone powder; mixing limestone powder and fly ash will reducethe early strength of concrete,but the late strength of concrete is improved.
Aiming at the compatibility of water-reducer and cementitious system in admixture concrete after mixing limestone powder,comparing the compatibility of water-reducer and different cementitious system( limestone powder-fly ash,limestone powder-slag,limestone powder-silica fume) through saturation point and fluidity. Result shows that remarkable difference existing between the compatibility of water-reducer and different cementitious system,mixing limestone powder can reduce the saturation point of polycarboxylic series super plasticizer; mixing fly ash and slag will improve the compatibility of polycarboxylic series super plasticizer and cementitious system mixing limestone powder; mixing silica fume will reduce the compatibility of polycarboxylic series super plasticizer and cementitious system mixing limestone powder; mixing limestone powder and fly ash will reducethe early strength of concrete,but the late strength of concrete is improved.
引文
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[2]章春梅,Ramachandran V S.碳酸钙微集料对硅酸三钙水化的影响[J].硅酸盐学报,1988,16(2):110-111.
[3]Ye G,Liu X,De Schutter G,et al.Influence of limestone powder used as filler in SCC on hydration and microstructure of cement pastes[J].Cement&Concrete Composites,2007,29(3):94-102.
[4]覃维祖.水泥-高效减水剂相容性及其检测研究[J].混凝土,1996,(2):11-17.
[5]阎培渝,王悦.可溶碱对水泥/氨基磺酸盐减水剂相容性的影响[J].建筑材料学报,2006,10:576-580.
[6]Johnson C D.Admixture-cement incompatibility,a case history[J].ACI course manual SCM,1990,23(41).
[7]Dodson V H,Hayden T D.Another look at the Portland cement/chemical admixture incompatibility problem[J].ACI coursemanual,1990,23(51):52-56.
[8]Jiang S P,Kim B G,Aitcin P C.Importance of adequate soluble alkali content to ensure cement-superplasticize compatibility[J].Cement and Concrete Research,1999,29(1):71-78.