机场道面自密实碱激发混凝土性能研究

针对机场道面混凝土强度、耐久性高性能化的要求,采用"优质矿渣+复合碱激发剂"的技术路线,配制出坍落度≥160 mm,抗折强度7 d达7.6 MPa、28 d达8.5 MPa的自密实碱激发胶凝材料混凝土,并研究了碱激发胶凝材料混凝土的耐久性能、变形性能、施工和经济性.与目前机场道面施工中采用的水泥混凝土进行对比试验,结果表明:其抗渗性、抗冻性、耐腐蚀性和耐磨性远优于传统水泥混凝土,抗渗等级达到S40以上,抗冻等级达到F300以上,耐硫酸盐和耐磨性能优异;碱激发胶凝材料混凝土属低收缩混凝土,但早期收缩略高,应采取措施加强早期养护.自密实碱激发胶凝材料道面混凝土的和易性、强度、耐久性可以满足机场道面铺筑要求,且具有良好的施工和经济性,可用于机场道面的建设.

Performance of Airport Pavement Self-compacting Alkali-activated Concrete

Aimed at high strength, durability requirements of airport pavement concrete, by adding Na2SiO3 and NaOH complex activator in slag, self-compacting alkali-activated concrete (AAC) is prepared with slump 160 mm and upwards, flexural strength 7 d and 28 d respectively reaching 7.6 MPa and 8.5 MPa. Its durability, distortion, construction and economy performances are also studied by comparing with porland concrete. The results show that the anti-permeability, anti-frozen, corrosion resistance and abrasion resistance of SCAAC are superior to the porland concrete, and its anti-permeability rank exceeds S40, anti-frozen rank exceeds F300, sulfate resistance and abrasion are excellent. The Alkali-activated concrete is of low deformation concrete but with ratherish great early deformation, therefore early keep should be reinforced. AAC can meet the requirements of airport pavement in workability, strength, durability, constructing and economy,and it can be applied to the construction of airport pavement.