减水剂对粗骨料膏体料浆流动性及强度的影响研究

Effect of water reducers on fluidity and strength of coarse aggregate filling slurry

为改善机制砂-全尾砂粗骨料膏体料浆的流动性,采用聚羧酸高性能减水剂(PCS)和萘系高效减水剂(SNF)两种类型的减水剂,开展不同减水剂及其添加量对充填料浆的屈服应力、黏度系数、扩展度和强度的影响研究。结果表明:两种减水剂均可提高充填料浆的流动性,其中萘系高效减水剂对充填料浆的流动性有显著的改善效果。与未添加减水剂充填料浆相比,当萘系高效减水剂添加量为1%、2%、3%时,屈服应力分别降低50.30%、84.08%和100%,扩展度提高了75%、131%和234%。一定充填配比下,添加两种减水剂均会降低充填体早期强度,但当减水剂添加量为1%时,对充填体的后期强度有一定的提高。

In order to improve the flowability of the manufactured sand and unclassified tailings coarse aggregate paste slurry,two types of water reducers,polycarboxylate superplasticizer(PCS)and naphthalene series superplasticizer(SNF)are used to study the effects of different water reducers and their additive amounts on the yield stress,viscosity,spread and strength of the filling slurry.The results show that both types of water reducers can improve the flowability of the filling slurry,and the naphthalene series superplasticizer water reducer has a significant improvement effect on the flowability of the filling slurry.Compared with the filling slurry without the addition of water reducer,when the addition amount of naphthalene series superplasticizer water reducer is 1%,2%,and 3%,the yield stress is reduced by 50.30%,84.08%,and 100%,respectively,and the spread is increased by 75%,131%,and 234%.Under a certain filling ratio,adding two types of water reducers can reduce the early age strength of the filling body,but when the amount of water reducer added is 1%,it can improve the late age strength of the filling body to a certain extent.