水下抗分散混凝土性能的研究

研究了水下抗分散剂（AWA）、高效减水剂（HWRA）、消泡剂（DF）和硅灰（SF）等对水下抗分散混凝土抗分散性和抗压强度的影响规律，并比较了两种典型的水下抗分散混凝土与普通混凝土的各项耐久性指标．结果表明：混凝土需水量随AWA掺量的增加而增大，而抗压强度随之下降；当HWRA与AWA复合使用时，HWRA存在一个最佳掺量；掺加DF和SF有利于提高水下抗分散混凝土的工作性和抗压强度；水下抗分散混凝土的抗渗性、抗冻性、抗化学侵蚀性、抗碳化性和抗Cl^-渗透性均远优于同强度等级的普通混凝土．

Investigations on Properties of Underwater Antiwashout Concrete

Effects of underwater antiwashout admixture(AWA), high-range water-reducing admixture(HWRA), defoamer(DF) and silica fume(SF) etc. on the washout resistance and com- pressive strength of concrete were investigated, and kinds of durability indexes for two typical underwater antiwashout concretes(UAC) were compared with normal concrete of the same strength grade. The results indicate that, (1) water demand of concrete increases and compre- ssive strength decreases with the increase of AWA dosage; (2) when HWRA and AWA are added together, there is an optimal HWRA dosage for obtaining good concrete properties; (3) adding DF and SF has the advantage in improving the workability and compressive strength of UAC; (4) the durability indexes such as impermeability, freeze-thaw cycling resistance, chemical attack resistance, carbonation resistance and Cl~- impermeability etc. of UAC all exceed that of normal concrete with the same strength grade.