The change of moisture distribution is concentrated on the surface layer concrete , which is very thin . however , the change inside the concrete is very slight . this unbalanced development of moisture distribution causes large shrinkage stress in the layer concrete and then leads to crack 混凝土湿度变化主要集中于较薄的表层混凝土内，内部湿度场变化极微，这种湿度发展变化的不均衡使得表层混凝土内产生较大的收缩应力，将直接导致裂缝的产生。
Abstract : abstraot : to clarify the principles of water vapour transfer throuhg waterproof breathable garments during wear , three wear trials , i . e . resting , exercising and rainy procedures were carried out in a climate chamber . three waterproof breathable and one impermeable garments were assessed in terms of their moisture accumulation in undergarments . it was found that both in steady conditions and in rainy conditions , the waterproof breathable garments are much more comfortable because of their good water proof permeability 文摘:为了了解在实际穿着过程中,防水透湿织物防水透气原理,本文进行了休息、运动及雨淋三种人体穿着实验,实验在人工气候室中进行,选择了三种防水透湿服和一件不透湿的一般雨衣来评估其穿着时衣服内的湿度变化.实验结果表明,防水透湿织物因其良好的防水透湿性能,而具有良好的穿着舒适性
