复掺陶瓷抛光砖粉与聚丙烯纤维对砂浆性能的影响

Effect of Ceramic Polishing Powder and Polypropylene Fiber on Properties of Mortar

以陶瓷抛光砖粉为辅助胶凝材料,通过单掺及复掺陶瓷抛光砖粉和聚丙烯纤维,研究了不同掺量的聚丙烯纤维及陶瓷抛光砖粉对砂浆稠度、抗压强度、抗折强度、干缩率和抗冻性的影响。研究结果表明:在单掺条件下,随陶瓷抛光砖粉掺量的增加,砂浆稠度变大;随聚丙烯纤维掺量的增加,砂浆稠度变小。在复掺条件下,当聚丙烯纤维掺量达到1.5 kg/m^3时,纤维掺入所导致的粘聚性增大成为主导因素。陶瓷抛光砖粉的掺入能够提高砂浆力学性能,且随其掺量增加,砂浆抗压强度与抗折强度增大;砂浆抗折强度随聚丙烯纤维掺量的增加而增加呈上升趋势,但砂浆抗压强度随纤维掺量的增加呈先降后增趋势。陶瓷抛光砖粉和聚丙烯纤维均能有效抑制砂浆的干缩,降低砂浆经冻融循环后的抗压强度损失率,提高砂浆的抗冻性能。

Ceramic polishing powder （PP） as supplementary cementitious materials and polypropylene fiber （PPF） were added to the mortar. Effects of PP and PPF on consistency, compressive strength, flexural Strength, drying shrinkage rate and frost resistance of mortar were studied. Results show that PP increase the consistency of mortar and PPF decrease the consistency of mortar. When the fiber content reaches up to 1.5 kg/m^3 , fiber content is the main affect on the consistency of mortar added PP and PPF compound. PP improve mechanical properties of mortar, and compressive strength and flexural strength increase with PP content increasing. PPF increase flexural strength of mortar, but compressive strength decreased firstly and then increased as PPF contend increasing. PP and PPF inhabit dry shrinkage of mortar, reduce compressive strength loss rate of mortar after freeze-thaw cycle and increase the frost resistance of mortar.