磁化水玄武岩纤维钢渣粉混凝土早期强度分析

张积安 马芹永

摘 要：为提高玄武岩纤维钢渣粉混凝土早龄期抗压强度，用磁化水代替普通水拌制混凝土。采用10种不同水流量流经磁化器后的水分别搅拌混凝土，进行混凝土早龄期抗压强度试验后选出合适水流量。合适水流量流经磁化器后的水分别搅拌10%、12%、14%、16%和18%不同钢渣粉掺量下玄武岩纤维钢渣粉混凝土，再进行早龄期抗压强度试验，得出合适的钢渣粉掺量。试验结果表明：玄武岩纤维掺量3 kg/m3和钢渣粉掺量15%时，合适水流量为16 L/min。磁化水加快了混凝土水化速率，生成更多水化产物，有效填充了结构中孔隙，混凝土强度得到提高。7 d抗压强度达到最大值26.4 MPa，较未用磁化水搅拌的混凝土早期强度增长15.3%。钢渣粉合适掺量范围为12%～15%。

关键词：玄武岩纤维；钢渣粉；抗压强度；磁化水；水流量

中图分类号： TU528.572 文献标志码：A

文章编号：1672-1098（2017）05-0025-04

Abstract：In order to enhance the early-age compressive strength of basalt fiber reinforced steel slag powder concrete， the magnetic water was used to take place of ordinary water in mixing procedure. Experiments of the early-age compressive strength of concrete were conducted to select suitable water flow when ten different types of water flow that flowed through the magnetizer respectively in mixing concrete. When the suitable water flow flowed through magnetizer， the experiments of early-age compressive strength of basalt fiber reinforced steel slag powder concrete were respectively conducted with 10%，12%，14%，16% and 18% amounts of steel slag powder， and the suitable amount of steel slag powder was obtained. The results indicated that the suitable water flow was 16 L/min when the basalt fiber value was 3 kg/m3 and the steel slag powder value was 15%. The magnetic water accelerated hydration rate of concrete， generated more hydration products， and filled the pores in concrete structure effectively， which improved the strength of concrete. Meanwhile the 7-day compressive strength of concrete reached maximum 26.4 MPa， which increased by 15.3% compared with the early-age compressive strength of basalt fiber reinforced steel slag powder concrete without using magnetic water. And the reasonable dosage of steel slag powder ranged 12%～15%.

Key words：basalt fiber； steel slag powder； compressive strength； magnetic water； water flow

綠色混凝土作为一种新型混凝土材料在建筑行业中的应用越来越广泛。具有节约水泥、充分利用工业废渣及减少环境污染等优点[1]，其将成为未来建筑材料研究发展的必然趋势。

相关试验表明，作为新型混凝土材料的玄武岩纤维钢渣粉混凝土具有节约水泥，流动性好等优点；玄武岩纤维的适量加入可增强混凝土抗压强度[2]。文献[3]研究了钢渣粉混凝土中掺入无机纤维后的力学特性，得出纤维掺量0.1 %、钢渣掺量10 %时，混凝土各龄期抗压强度均有不同幅度提高，但随着钢渣粉掺量的继续增加，混凝土强度下降。

水是混凝土试验中必不可少的组分之一，其性质的改变对混凝土力学性能会产生影响[4]。……