搅拌、振捣及养护对高性能混凝土强度影响的试验研究

应用正交试验设计设计9组高性能混凝土.正交试验为三因素三水平,选取L9(34)正交表.三因素三水平分别为搅拌(人工搅拌,机械搅拌,超时机械搅拌)、振捣(人工振捣,机械振捣,免振捣)及养护(自然养护,标准养护,绝湿养护).针对该9组混凝土进行14d及28d抗压强度试验,对试验结果进行正交试验的级差分析及方差分析.分析表明,搅拌、振捣及养护对高性能混凝土抗压强度影响程度排序为:搅拌,养护,振捣;最佳方式为:超时搅拌,免振捣,绝湿养护.

Testing Investigation on Effects of Mixing,Vibrating and Curing on Strength of High-Performance Concrete

9 groups of high-performance concrete specimens were designed for orthogonal test where each of the 3 factors was at 3 levels with an L9(3⁴) orthogonal table set out. The three factors/levels were the mixing at artificial, mechanical and overtime levels; the vibrating at artificial, mechanical and non-vibrating levels and the curing at natural, standard and humidity-insulated levels. The compressive strength tests for the 9 groups of high-performance concrete specimens were carried out for 14 days and 28 days separately, then the differential analysis and variance analysis were made for the orthogonal test results. The analyses indicated that among the three influencing factors on the compression strength of the high-performance concrete the mixing, curing and vibrating are ranked the first, second and third, respectively, and the optimal modes(levels) are the overtime mixing, non-vibrating and humidity-insulated curing.