优质9mmPP抗裂防渗聚丙烯纤维

水泥混凝土在硬化过程中，水泥和说的水化物反应，引起混凝土体积大收缩，在后期又由于混凝土内自由水份蒸发引起干缩，这些收缩应力超出水泥基体的抗拉强度就会在混凝土内部产生微裂缝。微裂缝发展约70%是在3-7d凝胶期内完成，此时混凝土的抗拉强度小于1MP。在混凝土中加入筑威系列混凝土砂浆用纤维后，纤维能轻易迅速均匀分散混凝土中形成一种乱向支撑体系，分散了混凝土的定向应力，阻止混凝土中原裂缝的发生和发展，消除或减少原生微裂缝的数量和尺度，大大提高了混凝土防裂抗渗能力，改善混凝土韧性，从而延长混凝土的使用寿命。另外由于纤维本身具有一定的强度，纤维均匀分散在混凝土中并形成锚固作用，其在瞬间可吸收一定的破坏能量。

降低混凝土的脆性，提高混凝土的韧性，改变混凝土的破坏特性。

早在70年代，美国就将聚丙烯纤维应用于军事掩体工程的修筑，有效防止了掩体在遭受袭击后因混凝土碎块飞溅而产生的人员伤害同时因纤维对破坏能量的吸收延缓了掩体彻底破的时间，降低了破坏程度。

提高喷射混凝土疲劳强度，改善泵送性能，减少回弹损失。

应用于隧道、矿井、地铁等墙面和顶部的喷射混凝土，斜坡加固等喷射混凝土，混凝土回弹、脱落不超过4%。

提高混凝土抗冻性能和耐温差性能，延长混凝土构件的使用寿命。

由于抗渗和抗裂性能的提高，水分进入混凝土内部造成的冻融影响可以降低，对混凝土结构物中钢筋和钢纤维的锈蚀影响也可以降到。该功能可大量应用于水工和临水建筑物，延长混凝土建筑物的使用寿命。另外也可与钢纤维互掺。用于铁轨轨枕、水泥电杆、水泥管道等混凝土构件的制造，有效保持制品边角、表面的完整性，有利于混凝土构件综合性能的提高。

增加混凝土内部含有一定的水分，高温下形成的水蒸汽无法排出而产生混凝土爆裂现象，聚丙烯微纤维高温融化后产生大量的毛细孔道有利于水蒸气的排出，而防止了混凝土建筑物高温爆裂现象。早在60年代，英国就使用聚丙烯微纤维应用在炼钢高炉建设，有效防止了高炉混凝土爆裂现象。为此聚丙烯微纤维又称防爆纤维。DXA polypropylene monofilament fiber Cement concrete in hardening process of cement and said hydrate reaction, caused by large concrete contraction because of concrete at the latter also free water evaporation caused by shrinkage, the shrinkage stress exceeded the tensile strength of cement matrix in concrete will be internal generated micro-cracks. The development of micro-cracks are about 70% at 3-7d gel during the finish, when the concrete tensile strength less than 1MP. In concrete to build add-wai series of concrete mortar fibers, the fibers can easily swiftly dispersed evenly in concrete to support the formation of a chaotic system, the directional dispersion of the concrete stress, concrete to prevent the occurrence of cracks in the Central Plains and development, to eliminate or reduce the original micro - cracks in the number and scale, greatly improving the impermeability of concrete cracking and the improvement of toughness of concrete, thus prolonging the service life of concrete. Also because of fiber itself has a certain strength, fiber uniformly dispersed in concrete and the formation of anchoring role at the moment of its destruction must absorb energy.Reduce the brittleness of concrete, improve the toughness of concrete, the damage characteristics of concrete change. In the early 70s, polypropylene fiber used in the United States will work to build military bunkers, at the effective prevention of the bunker after the attacks of concrete fragments of spatter resulting from injury to persons at the same time due to fiber damage energy absorption delaying the bunker completely broken time, reducing the damage.Improve fatigue strength of sprayed concrete to improve the pumping performance, reduce the loss of resilience. Used in tunnels, mines, subway, etc. at the top of the wall and shotcrete, slope reinforcement, such as shotcrete, concrete rebound, falling not more than 4%. Improve performance and temperature of concrete antifreeze bad performance, extend the service life of concrete structures.