film fiber meaning in English
膜裂纤维
Examples
- The expansion agents can only make up the shrinkage to some extent , and the compensation effects would be reduced when the retardener and fly - ash are used . the expansion agents are not panaceas to avoid the shrinkage cracking as expansion can also reduce the concrete soundness . under bad curing condition , the polypropylene fibrillated film fiber can improve concrete ' s anti - crarking property , while the nominal steels have very unobvious effects . to reduce the concrete shrinkage thus avoid the cracking , the former factors must all be taken into account in concrete proportion design to develop sound concrete
研究结果表明，水泥的品种和用量是影响混凝土收缩值的主要因素之一，当混凝土中水泥用量超过470kg / m ~ 3时，混凝土的收缩值超过400 10 ~ ( - 6 ) ，在约束状态下存在高开裂风险；采用细砂使混凝土单位用水量显著提高，收缩值也大幅增加；优质粉煤灰总体上能抑制混凝土的收缩，以超量方式掺入其抑制作用更加明显，但粉煤灰混凝土早期的粘聚性较差，应注意养护，以免失水产生龟裂；早强减水剂和缓凝减水剂都会使混凝土收缩值增加；膨胀剂只能补偿混凝土部分收缩，同时受缓凝剂和粉煤灰的抑制，而且膨胀使混凝土的体积安定性增加了不确定因素，膨胀剂不是解决混凝土收缩裂缝的良方。