东非地区大吸水率骨料混凝土改善技术研究

关键字：大吸水率骨料,易流型复合掺合料,工作性能,长期

（1.中交第二公路工程局有限公司海外事业部，陕西 西安 710065；2.中国建筑科学研究院，北京  100013；3.北京科技大学，北京  100083）

    摘要：通过掺入易流型复合掺合料来改善东非地区大吸水率骨料对混凝土造成的工作性能差、长期性能和耐久性能严重不足的问题。结果表明：易流型复合掺合料与粉煤灰按7∶3比例等量取代35%水泥时，大吸水率骨料混凝土流动性、密实性、抗冻性、抗收缩性能等均得以显著改善；易流型复合掺合料与粉煤灰按5∶5比例等量取代35%水泥时，大吸水率骨料混凝土上述性能与普通骨料混凝土相当，完全能够满足现场施工条件及100年服役寿命要求。
    关键词：大吸水率骨料；易流型复合掺合料；工作性能；长期耐久性能
    中国分类号：TU528        文献标识码：A         文章编码：1001-702X（2017）04-0091-04

Research on the improvement of high water absorption aggregate concrete in East Africa
QU Dongming1，LI Kang2，3，XIA Jingliang2，ZHOU Yongxiang2，WANG Yonghai2
（1.CCCC Second Highway Engineering Co.，Xi'an 710065，China；2.China Academy of Building Research，Beijing 100013，China；3.University of Science and Technology Beijing，Beijing 100083，China）

    Abstract：Incorporating easy flow pattern compound mineral admixtures to improve the poor workability，insufficient long-term performance and durability of concrete made of the high water absorption aggregate in East Africa. Results show that：when the replacement of easy flow pattern compound mineral admixtures and fly ash substitute equivalently cement is up to 35% with ratio of 7∶3，the mobility，compactness，freeze-thaw resistance and anti-shrinkage performance and so on all are significantly improved；when easy flow pattern compound mineral admixtures and fly ash substitute equivalently cement is up to 35% with ratio of 5∶5，above performance of concrete made of the high water absorption aggregate is equivalent to that of normal aggregate concrete，which can fully satisfy the site construction condition and 100 year service life requirements.
    Key words：high water absorption aggregate，easy flow pattern compound mineral admixtures，workability，long-term durability