外部条件：可从纤维在混凝土/砂浆中所处的形态以及纤维对集料的关系两个方面来理解。 External conditions: can be understood from the fiber in the concrete / mortar in the form, as well as fiber to aggregate two aspects of understanding. 纤维在混凝土/砂浆中能否乱向均匀分布，是关系到纤维能否发生作用的关键。纤维作用的机理无论怎样解释，都必须保证纤维在混凝土/砂浆中呈均匀、乱向分布的状况下才能发挥作用。由于纤维在生产过程中对其表面采用不同的活性剂配伍进行处理，使纤维遇水均匀分散，再加上外力与混凝土各种集料搅拌进一步使纤维与各种集料握裹。杜拉纤维便于分散均匀，是所有使用过该产品的人员所公认的。 Whether fiber can be distributed uniformly in concrete or mortar is the key to whether fiber can act or not. No matter how to explain the mechanism of fiber action, it is necessary to make sure that fiber can be distributed uniformly and randomly in concrete / mortar. Because the fiber in the production process of the surface active agents with different treatment, the fiber dispersed in water, coupled with the external force and the concrete aggregate mixing makes the fibers with various aggregate bond. The fibers are easy to disperse and are widely accepted by all those who have used the product. 我们一般在透明水杯的清水中放入少量纤维进行搅动，便可以直观的发现杜拉纤维呈立体悬浮状乱向分散，且长时间放置都不会有太大变化；而某些同类的产品，经搅动后可能分散，但时隔不久便会上浮为一絮状层。据反映凡是有后者情况的纤维，在混凝土/砂浆的实际配制过程中多不易均匀分散。这种观察办法和有人提出的“纤维层高稳定率”办法大同小异。由于聚丙烯纤维密度小于水以及纤维表面活性剂的作用，分散在水中的纤维受浮力及表面活化能的影响，会逐渐呈现较为明显的分层和离析的状态，将不同品牌的短纤维放置在量杯中搅拌后静置，在不同的时间段测量其悬浮状层高的办法来比较其稳定性的办法以判断纤维的分散性。纤维对集料的握裹状况，是能否起作用的另一个关键。纤维能够尽可能多的握裹集料，避免在受力时被拔出。不同的纤维制成标准不同，在电子显微镜下可以看到呈现不同的握裹集料的情况。如果加入纤维后的混凝土塌落度没有损失，这种纤维不是分散不好就是握裹力差，纤维的作用无从谈起。 We put a small amount of fiber in water in the cup stir can intuitively find durafiber a three-dimensional suspended chaos to disperse, and for a long time will not have too much change; and some similar products, the agitation may disperse, but soon will go up as a flocculent layer. It is shown that the fibers in the latter condition are not easily dispersed in the concrete preparation process. This method of observation and some people put forward "fiber layer stability rate" method is very similar. The polypropylene fiber density is less than water and the effect of fiber surface active agent, dispersing the fibers in water by the activation energy of the effects of buoyancy and surface, will gradually appear more obvious stratification and segregation, the short fibers of different brands placed in the measuring cup after mixing the static measurement, the suspended height in different time the way to compare the stability of the way to determine the dispersion of fiber. Whether the fiber's grip on the aggregate is another key to its function. The fiber can hold the aggregate as much as possible so as not to be pulled out when it is stressed. Different fibers are made of different standards and can be seen in an electron microscope showing different grip aggregates. If the addition of fiber after the concrete slump is not lost, the fiber is not dispersed is not good grip, the effect of fiber impossible. 内部条件： 纤维能够起作用，还在于纤维本身的力学性能。这种关系要适当，并非纤维的抗拉强度特别高才能产生高的阻裂效用。纤维在受到拉力的过程中发生拉伸变形，如果比值不适当，则抗拉强度不可能达到要求。当然，由于制成材料的限制，该数据只能尽量满足要求。聚丙烯纤维抗拉强度过大，可能会导致脆性加大。 Internal condition: fiber can act, but also in the mechanical properties of the fiber itself. This relationship should be appropriate, not because the tensile strength of fibers is particularly high to produce high crack resistance. Tensile deformation occurs when the fibers are subjected to tension, and tensile strength is not possible if the ratio is not appropriate. Of course, due to the limitations of the material, the data can only meet the requirements. Polypropylene fiber tensile strength is too large, may lead to brittle increase.