内养生桥面铺装混凝土抗早期塑性开裂性能

为改善桥面铺装混凝土抗早期塑性开裂性能,通过平板约束法和现场桥面铺装实体工程研究了内养生材料对混凝土抗早期塑性开裂性能的影响。试验结果表明,内养生材料可以有效延缓混凝土的早期开裂,且随着内养生材料掺量的增加,混凝土抗早期塑性开裂性能越好;当内养生材料掺量为0.2%(质量分数)时,平板约束法下的混凝土单位开裂面积由1 219 mm²/m²降低到47 mm²/m²。在实体工程应用中,同普通混凝土相比,0.2%掺量的桥面铺装混凝土单位面积裂缝条数、最大长度、最大宽度以及开裂面积分别同比下降了91.7%、55.8%、37.5%、90.7%,说明内养生材料可以显著提升桥面铺装混凝土抗早期塑性开裂的性能。

Anti-Early Plastic Cracking Properties of Concrete Bridge Deck Pavement with Internal Curing

In order to improve the anti-early plastic cracking properties of concrete bridge deck pavement. Influence of internal curing materials on the anti-early plastic cracking properties of concrete was investigated with slab restraint method and on-site entity engineering of bridge deck pavement. The results indicate that internal curing materials effectively delay the early cracking of concrete, and theanti-early plastic cracking properties of concrete are improved with the increase of the content of internal curing materials. When the content of internal curing materials is 0.2% (mass fraction), the unit cracking area of concrete decreases from 1 219 mm²/m² to 47 mm²/m² through the slab restraint method. Compared with ordinary concrete, the number of cracks, maximum length, maximum width, and cracked area per unit area decrease by 91.7%, 55.8%, 37.5%, 90.7% with 0.2% internal curing materials, the internal curing materials significantly improve theanti-early plastic cracking properties of concrete bridge deck pavement.