新型混凝土渠道接缝材料抗冻性能研究

Antifreeze Characteristic of New Joint Sealing Material in Concrete Canal

对一种新型混凝土渠道接缝材料的抗冻性能进行了研究。经过200次冻融循环,发现不同处理的材料拉伸强度均有下降趋势,添加0%,10%,35%,55%粉煤灰的材料拉伸强度与对照比较分别下降了29%,5%,30%,25%,在材料中添加适量填料可改善材料性能,拉伸强度下降最小的材料与对照比较只下降了5%;同时材料的断裂拉伸率也有下降趋势;冻融处理后材料表面的孔隙明显变大、增多。该材料的抗冻性能优良,在我国北方地区推广应用尤为适宜。

Antifreeze characteristic is an important performance index for joint sealing material, this study investigated the antifreeze characteristic of a new joint sealing material used in concrete canal. After 200 times freeze-thaw cycle, we found that the tensile strength of material under different treatment all showed downtrend, the tensile strength of material added fly ash by 0%, 10%, 35%, 55% had been decreased by 29%, 5%, 30 %, 25% respectively, compared to control. Adding appropriate additive can ameliorate material performance; the material with the smallest decrease of tensile strength had been decreased by 5% only, compared to control, in the meanwhile, the elongation at break of material showed downtrend, too. After freeze-thaw cycle treatment, the surface pores of material had been extended, multiplied. The result indicated that the antifreeze characteristic of the material we studied on is excellent, and it can be used widely in northern regions of China.