This study aims to investigate the effect of water on the properties of cast in situ foamed concrete with a dry density of 300–800 kg/m3 (100 kg/m3 is a gradient). Firstly, the shrinkage deformation with the curing time and the volumetric moisture content is studied by the drying shrinkage test and improved drying shrinkage test. Secondly, the influence of volumetric moisture content on mechanical properties is assessed. At last, the effects of immersion time and immersion type on the mechanical properties of foamed concrete are studied by considering the water-level conditions. The achieved results show that the shrinkage deformations increase with the curing time for the drying shrinkage test and the improved drying shrinkage test, while the variations are different. The shrinkage deformation increases with the decrease of volumetric moisture content for six dry densities of foamed concrete. Besides, it gradually changes in the early stage, while it changes fast in the later stage. The compressive strength and elastic modulus decrease with the increase of volumetric moisture content for each density. For the water-level unchanged condition, the compressive strength and elastic modulus initially decrease and then slowly increase with the increase of the immersion time. For the water-level changed condition, the compressive strength and elastic modulus of foamed concrete decrease with the increase of immersion time for each dry density, and the rate of early attenuation is high, whereas the rate of later attenuation is limited.
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机译：这项研究旨在研究水对干密度为300–800–kg / m3（100 kg / m3为梯度）的现浇泡沫混凝土性能的影响。首先，通过干燥收缩试验和改进的干燥收缩试验研究了随固化时间和体积水分含量的收缩变形。其次，评估了体积水分含量对机械性能的影响。最后，考虑水位条件，研究了浸泡时间和浸泡方式对泡沫混凝土力学性能的影响。所得结果表明，对于干燥收缩试验和改进的干燥收缩试验，收缩变形随固化时间的增加而增加，而变化则不同。对于六种干密度的泡沫混凝土，收缩变形随着体积含水量的减少而增加。此外，它在早期阶段逐渐变化，而在后期阶段快速变化。压缩强度和弹性模量随每种密度的体积水分含量的增加而降低。对于水位不变的条件，随着浸泡时间的增加，抗压强度和弹性模量开始下降，然后缓慢增加。对于水位变化条件，泡沫混凝土的抗压强度和弹性模量随着每种干密度的浸泡时间的增加而降低，并且早期衰减率很高，而后期衰减率受到限制。
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