【摘要】 以C30自密实混凝土为研究对象,研究聚羧酸高效减水剂、萘系减水剂、木钠减水剂过掺对其新拌性能、力学性能和耐久性能的影响。试验结果表明:3种减水剂的过掺均会使C30自密实混凝土坍落扩展度增加、含气量降低、凝结时间延长、混凝土立方抗压强度、28 d轴心抗压强度、28 d弹性模量降低、耐久性变差。此外,对混凝土28 d抗折强度的影响则因减水剂种类而异。更多还原

【Abstract】 It investigated the effects of the over-dosage of polycarboxylate superplasticizer,naphthalene superplasticizer sodium and thesodium lignosulphonate on the performance of fresh concrete,mechanical properties and durability of C30 self-compacting concrete.Theresults showed that the over-dosage of all the three water reducing admixtures would increase the flowability of the fresh concrete,reducethe air content,prolong the setting time.The over-dosage of the water reducing admixtures would also reduce the compressive strength ofthe axial compressive strength and the modulus of elasticity of concrete curing for 28 day.In addition,the flexural strengths of concrete curingfor 28 days were different due to the types of water-reducing agent.更多还原