集料含泥量对减水剂性能影响及敏感性研究

工程中砂石含泥量对减水剂性能造成不利影响,为探索集料含泥量对减水剂性能影响规律和影响机制,系统研究了砂含泥量对聚羧酸减水剂、萘系减水剂的减水性能影响,并进行了减水效果敏感性分析。结果表明:砂含泥量为3.0%~3.4%时,减水剂的减水效果对砂含泥量的敏感性最高,聚羧酸减水剂掺量增加,砂含泥量对其减水效果影响增大;砂含泥量小于3.0%时,大掺量萘系减水剂对含泥量敏感性较小;含有微量的黏土,能够提高萘系减水剂的减水效果。

Sensitivity Analysis of Silt Content on Performance of Water-reducers

The performance of water-ruducers is affected greatly by silt content of aggregate .In order to explore the influ-ence law and influence mechanism of silt content on water-reducers ,the influence of silt content of sand on water reduc-tion performance of polycarboxylate superplasticizer and naphthalene superplasticizer was systematically investigated .Sen-sitivity analysis of water-reducers was conducted .The results show that water reduction performance of superplasticizer is sensitive to the 3 .0% ~3 .4% of silt content ;A certain amount of silt can contribute to the improvement of water reduc-tion performance of naphthalene superplasticizer .