摘要
介绍了活性粉末混凝土的配制原则和技术,全面总结了活性粉末混凝土及其构件的力学性能、耐久性和耐高温性能。分析表明,钢筋在活性粉末混凝土中黏结锚固长度计算时,钢筋外形系数比在普通混凝土中的大;活性粉末混凝土梁弯曲开裂应变为705×10^-6-864×10^-6,大于普通混凝土梁的80×10^-6-120×10^-6;活性粉末混凝土梁受压边缘极限压应变4 100×10^-6-5 500×10^-6,高于普通混凝土梁的3 300×10^-6;活性粉末混凝土梁截面抵抗矩塑性系数随纵向受拉钢筋配筋率的增加而增大;由于斜裂缝两侧无粗骨料相互咬合,活性粉末混凝土梁斜截面受剪承载力试验值较预估值低;活性粉末混凝土相对于普通混凝土具有较强的抗氯离子渗透性能、抗碳化性能、抗冻融性能和抗腐蚀性能;在活性粉末混凝土中合理掺加纤维可有效预防高温爆裂。扼要介绍了活性粉末试点工程,展示了其广阔的应用前景。
This paper introduces the proportioning principles and technology of reactive powder concrete（ RPC）,and then summarizes RPC durability and high temperature resistance. It is found that in the calculation of bond-anchorage length,the appearance coefficient of steel bar is higher in RPC than in ordinary concrete. The flexural cracking strain of RPC beam is 705 × 10^- 6-864 × 10^- 6,higher than that of ordinary concrete beam,which is 80 × 10^- 6-120 × 10^- 6.The normal section limit compressive strain of RPC beam is 4 100 × 10^- 6-5 500 × 10^- 6,higher than that of ordinary concrete beam,which is 3 300 × 10^- 6. The plastic influence coefficient for sectional resisting moment of RPC beam increases with the longitudinal reinforcement ratio; the test value of inclined section shearing load-bearing capacity is lower than the calculated value due to lack of coarse aggregate interlock effect on both sides of inclined cracks in RPC beam. Compared with ordinary concrete,RPC possesses excellent performance of chloride ion permeability resistance,carbonation resistance,frost thawing resistance and sulfate resistance; RPC mixed with fiber appropriately can prevent thermal spalling effectively. Finally,this paper briefly introduces the pilot projects of RPC and manifested its broad application prospects.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第10期44-58,共15页
Journal of Building Structures
基金
国家教育部长江学者奖励计划项目(2009-37)
哈尔滨工业大学"985工程"优秀科技创新团队建设项目(2011)
关键词
活性粉末混凝土
力学性能
耐久性能
耐火性能
试点工程
reactive powder concrete
mechanical property
durability
fire performance
pilot project
