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基于等强度原则,设计了内养护水灰比分别为0、0.04、0.08和0.12的4组高强混凝土,研究了密封和干燥两种养护条件下,预吸水轻骨料的体积掺量对混凝土早龄期自由收缩、内部湿度及弹性模量的影响。结果表明:随着内养护水引入量的增大,28d龄期内高强混凝土内部湿度下降和早期总收缩变形均得到明显缓解,且对密封养护混凝土的影响更明显;但混凝土的弹性模量随轻骨料掺量增大而下降,应用中应优化选择预吸水轻骨料的掺量。在干燥环境条件下,轻骨料预吸水内养护法并不能根除干燥收缩,内养护高强混凝土中可能存在较大的内部湿度梯度及近表面干燥现象。
Based on the principle of equal strength, four groups of high strength concrete with water conservation and cementing ratios of 0, 0.04, 0.08 and 0.12 were designed respectively. Under both sealing and drying conditions, the volumetric contents of pre-absorbent lightweight aggregates Age free contraction, internal humidity and elastic modulus. The results show that with the increase of the introduction of internal curing water, the internal moisture content and total shrinkage deformation of the high-strength concrete in 28 days are obviously relieved, and the impact on the sealed concrete is more obvious. However, the elastic modulus of the concrete Lightweight aggregate content increases and decreases, the application should optimize the selection of pre-absorbent lightweight aggregate content. Under dry environmental conditions, the light aggregate within the pre-absorbent curing method can not eradicate drying shrinkage, there may be a large internal humidity gradient within the conservation concrete and near surface drying phenomenon.