消泡剂在制备再生GRC中的应用研究

Study on the Application of Defoamer in the Preparation of Recycled GRC

本文研究了废混凝土再生骨料部分替代天然石英砂制备玻璃纤维增强水泥材料过程中,利用消泡剂控制水泥砂浆的含气量和流动度。对比了废混凝土再生骨料部分替代天然石英砂,不同替代掺量下,掺加消泡剂对再生GRC材料抗压强度、抗弯强度和抗冲击强度的变化影响。试验结果如下:废混凝土替代天然石英砂替代掺量为30%时,掺加0.2%的消泡剂,可使再生GRC的抗压、抗弯和抗冲击强度值得到显著提高,分别达到54.1MPa、21.7 MPa和31.3KJ/m^2。

In order to control the volume and fluidity of cement mortar, defoamer is used to prepare GRC material instead of natural quartz sand.The influence of waste concrete recycled aggregate instead of natural quartz sand on the compressive strength, flexural strength and impact strength of recycled GRC materials is investigated under different substitution amounts of defoamer. The test results are as follows： when the replacement of natural quartz sand instead of natural quartz sand is 30%, adding 0.2% defoamer can significantly improve the compressive, bending and impact strength of recycled GRC, reaching 54.1MPa, 21.7 MPa and 31.3KJ/m2.