【摘要】 采用平板限制收缩试验法,研究了减水剂与膨胀剂及其复合技术对聚丙烯纤维增强高性能混凝土的早期抗裂性的影响。结果表明,聚丙烯纤维增强高性能混凝土的早期抗裂性大小顺序为:UEA-N混凝土膨胀剂与聚羧酸高效减水剂复合的纤维增强高性能混凝土>AEA混凝土膨胀剂与聚羧酸高效减水剂复合的纤维增强高性能混凝土>AEA混凝土膨胀剂与萘系减水剂复合的纤维增强高性能混凝土>纤维增强高性能混凝土。因此,采用UEA-N混凝土膨胀剂与聚羧酸高效减水剂的复合外加剂技术和聚丙烯纤维增强技术是防止高性能混凝土发生塑性收缩开裂的比较理想的技术措施。更多还原

【Abstract】 By using the restricted shrinkage slab test,early effects of admixture on the cracking resistance of polypropylene reinforced high-performance concrete are investigated.Results show that the orders from large to small of the early cracking resistance of polypropylene reinforced high-performance concrete is as follows: the resistance to cracking of the polypropylene reinforced high-performance concrete with the combination of UEA-N concrete expansion agent and polycarboxylate type superplastieizers>the combination of AEA concrete expansion agent and polycarboxylate type superplastieizers>the combination of AEA concrete expansion agent and naphthalene superplasticizers>high performance concrete.Therefore the polypropylene reinforced high-performance concrete combined UEA-N concrete expansion agent and polycarboxylate type superplastieizers is benefit to the plastic shrinkage and cracking of concretes.更多还原