The solidification shrinkage mechanism of unsaturated polyester resin is analysized by using free Volume theory in this paper.
本文用自由体积理论分析了不饱和聚酯树脂的固化收缩机理。
Moreover, the relation between the loss rate of water and the drying shrinkage of binder paste is tight and namely free shrinkage was increased with the increase of loss rate of weight.
同时，发现碱作用下水泥基材料的水分损失与收缩过程密切相关，即浆体的收缩随着水分的损失更加明显。
Throughout the drying process, the surface of the free shrinkage strain is the largest, the more close to the core layer the smaller the free shrinkage strain.
在整个干燥过程中，表层的自由干缩应变最大，越靠近芯层自由干缩应变越小。
On this purpose, the performence of free shrinkage of mortar and restrained shrinkage of concrete were studied.
为实现这一目的，作者研究了砂浆的自由收缩规律与混凝土的环形约束收缩规律。
It had been proved that the free shrinkage can't be used to evaluate crack resistance of concrete directly and the evaluation experiments should be carried out under restrained circumstance.
自由收缩值不能直接用于评价水泥基材料的抗裂性能，试验必须在约束条件下进行。
The result shows that the tests, which are used in this paper, including ring test and free shrinkage test, could do well in evaluating the shrinkage-cracking potential of HSC.
研究结果表明：本文提出的采用圆环法和与圆环同步的测长法相结合共同评价高强混凝土的收缩开裂趋势的方法，能较好的评价高强混凝土的收缩性能。
Experimental results indicate the following: firstly, the initial cracking time of mortar increase and free shrinkage decrease with the percentage of blended fly ash increasing.
试验表明，随着粉煤灰掺量的增加，粉煤灰砂浆的初始开裂时间显著增加。
Experimental results indicate the following: firstly, the initial cracking time of mortar increase and free shrinkage decrease with the percentage of blended fly ash increasing.
试验表明，随着粉煤灰掺量的增加，粉煤灰砂浆的初始开裂时间显著增加。
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