钢渣掺合料对碱集料反应抑制及有效性评估

摘要

The effectiveness of steel slag powder on suppressing alkali-aggregate reaction (AAR) expansion was assessed using the method of ASTM C441. The results show that mineral admixtures with steel slag powder as partial replacement for Portland cement in concrete is an effective means for controlling expansion due to AAR. About 50 percent decrease in expansion rate of mortar bars can be found. When actual engineering aggregate is tested, a suitable method can be used to assess the effectiveness of steel slag powder on suppressing AAR expansion with the temperature is higher and the alkali solution is more concentrated. The results show that mineral admixtures with steel slag powder have effective prevention of expansion while total admixture content is 30 percent by mass of cement, especially, mineral admixtures with only blast furnace slag and compound mineral admixture prepared with steel slag powder to blast furnace slag ratios of 0. 5.%利用ASTM C441方法进行钢渣掺合料抑制碱集料反应的有效性评估试验,钢渣掺合料抑制碱集料反应效果良好,砂浆棒膨胀率能够减少约50%;针对实际工程集料,采用提高养护温度和养护碱溶液浓度的优化试验方法进行有效性评估试验.试验结果表明,矿物掺合料达到胶凝材料总量的30%,单掺矿渣粉以及钢渣粉和矿渣粉复掺比例为1:2时,钢渣掺合料对碱集料反应有较强的抑制效果.