restraint crack造句

• The results of experiment on the relationship between tensile strength , shrinkage , self - desiccation shrinkage and flat restraint cracking show that sra ' s physical shrinkage - reducing effect and ea ' s chemical expansion effect greatly enhance the volume stability of concrete and reduce the probability of early - cracking
  对减缩剂与膨胀剂抗拉强度、干缩、自干燥收缩及平板约束开裂的试验结果表明： sra的物理减缩作用及膨胀剂的化学膨胀作用，大大提高了混凝土早期的体积稳定性，降低了早期开裂的概率。