多元凝胶紧密堆积对活性粉末混凝土的影响

Effect of high packing of multi-component cementitious materials on the performance of reactive powder concrete

讨论了C(水泥)+UPFA(超细粉煤灰)、C+SF(硅灰)二元和C+UPFA+SF三元胶凝材料体系中,新拌浆体的黏度、流动度与浆体的相对密实度的关系,以及相对密实度和流动度对活性粉末混凝土RPC强度的影响。实验结果表明:(1)双掺硅灰和超细粉煤灰,随活性粉末掺量的增加,新拌浆体的黏度增加,流动性下降,相对密实度提高;(2)双掺硅灰和超细粉煤灰的RPC强度远高于单掺硅灰时的强度;(3)RPC强度与体系中胶凝材料的相对密实度和流动度有关,复掺硅灰和超细粉煤灰,当密实度为0.669,流动度为182 mm时,其RPC的7d抗压强度高达150.4 MPa。

Discussed on the relation between the viscosity ＆ fluidity of fresh paste and the relative degree of compaction in the binary cementitious material system of cement＋ultra-fine fly ash（C＋UPFA）, cement＋ silica fume（C＋SF） and the ternary system of C＋UPFA＋ SF, as well as the effect of the relative degree of compaction and fluidity on the strength of reactive powder concrete（RPC）. The results shows that in the binary system, with the increase of reactive powder, the viscosity and relative degree of compaction of fresh paste increased whenas the fludity decreased; the strength of PRC of C＋UPFA＋SF is high than that of the C＋UPFA and C＋SF, and the strength of RPC related to the cementitious materials＇ relative degree of compaction and fluidity as in C＋UPFA＋SF system, when the relative degree of compaction was 0.699 and the fluidity was 182 mm, the 7d compression strength of RPC was 150.4 MPa.