青藏高原地区高性能道面混凝土应用研究

Research and application of high performance pavement concrete in the Qinghai-Tibet Plateau zone

针对青藏高原严酷地区自然环境条件恶劣,对水泥混凝土道面的使用品质要求高,而传统的普通道面混凝土早期存在施工和易性不易控制、匀质性稍差、极易出现塑性收缩裂缝现象,而硬化后期又存在强度储备少、道面表面品质和耐久性不良等现象,通过掺加粉煤灰、引气剂和减水剂等外掺剂配制适应于青藏高原严酷地区的高性能道面混凝土。室内试验和现场应用效果均表明:与传统的普通道面混凝土相比较,粉煤灰和引气减水剂复合的高性能道面混凝土施工方便,匀质性好,抗折强度、抗冻性、抗渗性和耐磨性能均有显著提高,建议在青藏高原严酷地区修建的机场道面工程中大力推广应用这种高性能混凝土。

Aiming at the badly environment of the Qinghai-Tibet Plateau rigorous zone,which bringed the requests for high quality of the cement concrete pavement, but there were bad workability and uniformity, low strength safety, bad surface quality durability phenomenon of common pavement concrete, high performance pavement concrete adapted to the Qinghai-Tibet Plateau rigorous zone was prepared by mixing fly ash, air-entraining and water-reducing agent.Indoor tests and field application results both suggested that the concrete were poured conveniently and easily, and had better uniformity, strength, frost resistance and abrasion resistance performance.lt＇s suggested to popularize and applicate the high performance pavement concrete mixed with admixtures in the Qinghai-Tibet Plateau rigorous zone airport pavement engineering.