互补性凝胶材料在混凝土路面性能上的作用

The Role of Complementary Gel Materials in the Performance of Concrete Pavement

互补性凝胶材料已应用于水泥混凝土路面,以提高路面抵抗碱硅反应、冻融、渗透性等老化机制的能力.本文通过试验研究C类粉煤灰、F类粉煤灰和矿渣粉对水泥混凝土路面性能的影响,进行了不同组成和比例的互补性凝胶材料组成的多组实验,包括了坍落度、密度、含气量、凝结时间、抗压强度、挠曲强度、碱硅反应、冻融、徐变、渗透性以及干湿实验.同时,进行了四组路面测试.研究结果表明,向混凝土中掺入15%~20%的C类粉煤灰和20~25%的F类粉煤灰,或者掺入15%~20%的C类粉煤灰、F类粉煤灰和矿渣粉,均能较好改善混凝土的耐久性和整体性能.

Supplementary cementitious materials have been used in concrete pavements to increase their resistance to deterioration mechanisms,such as alkali-silica reaction, freeze and thaw, and permeability. This paper presents the results of experimental investigation carried out to evaluate the effect of Class C fly ash, Class F fly ash, and ground granulated blast furnace slag on the performance of Concrete pavements. Laboratory testing of multiple mixes with different combinations and percentages of supplementary cementitious materials is presented. This testing includes slump, unit weight, air content, time of setting, compressive strength, flexural strength, alkali silica reactivity, freeze/thaw, length change, chloride ion penetration, and wet and dry test specified. Test results indicates that using the a combination of Class C fly ash （15%-20%） and Class F fly ash （20%-25%）, or all three supplementary cementitious materials in the range of 15-20% each improve concrete durability and overall performance.