含钢渣复合掺合料对混凝土耐久性的影响

Effects of Compound Mineral Admixture with Steel Slag on Durability of Concrete

研究了掺钢渣、矿渣和粉煤灰复合掺合料混凝土的碳化、氯离子渗透、碱集料反应、抗冻及绝热温升性能.结果表明:在同水胶比下,复合掺合料等量取代水泥后,混凝土的抗碳化性能和抗氯离子渗透性能有明显提高,混凝土碱集料反应膨胀率显著降低,当复合掺合料用量超过50%,混凝土抗冻性有所降低.掺加复合掺合料可显著减小胶凝材料的水化热,以及混凝土的绝热温升值和温升速率.

A study was made of the carbonation,chloride ion penetration and alkali-aggregate reaction（AAR）,frost-resistance and adiabatic temperature rise of concrete with compound mineral admixture（CMA） of steel slag,granulated blast furnace slag and fly ash.The result shows that the resistance to carbonation and chloride ion penetration and expansion caused by AAR of concrete can be improved obviously in comparison with ordinary concretes at the equal water/binder ratio by substituting CMA for cement at equal quality,and the frost-resistance of concrete decreases dramatically with CMA over 50%.The hydration heat of cementitious material,adiabatic temperature rising and the rising velocity decrease remarkably with CMA substitute for cement.