橡胶混凝土与普通混凝土的粘结劈拉强度

对橡胶混凝土与普通混凝土粘结劈拉强度进行试验研究,为橡胶混凝土在工程应用中的质量安全提供理论支持和技术保障。试验选用2种橡胶颗粒粒径、5种橡胶颗粒掺量及其经复合改性后配制橡胶混凝土作为新浇混凝土,普通混凝土作为老混凝土,并选用3种界面剂进行橡胶混凝土与普通混凝土的粘结劈拉强度试验,研究了橡胶颗粒粒径、橡胶颗粒掺量、复合改性和界面剂对粘结劈拉强度的影响。结果表明:橡胶颗粒粒径对橡胶混凝土与普通混凝土的粘结劈拉强度的影响因界面剂不同而有所差别;随着橡胶颗粒掺量增加,橡胶混凝土与普通混凝土的粘结劈拉强度先升后降,在一定掺量下达到最大值;橡胶混凝土与老混凝土的粘结劈拉强度都小于新浇橡胶混凝土整体劈拉强度,涂刷水泥净浆界面剂与不涂刷界面剂对于普通新老混凝土粘结时劈拉强度有较大差别,但对于橡胶混凝土与老混凝土粘结时劈拉强度相差不大,涂刷新型改性环氧界面剂时粘结劈拉强度最大。橡胶颗粒经复合改性后,橡胶混凝土与普通混凝土的粘结劈拉强度较未改性前有所提高。综上所述,新型改性环氧界面剂具有较好的粘结效果,可显著提高橡胶混凝土与普通混凝土的粘结劈拉强度。

Adhesive Splitting Tensile Strength of Rubberized Concrete Bonded with Ordinary Concrete

In the aim of providing theoretical and technical support for the quality and safety of rubberized concrete in engineering application, tests were conducted to investigate the adhesive splitting tensile strength of rubberized concrete bonded with ordinary concrete (RC-OC). The influences of rubber particle size, rubber particle dosage, composite modification and interfacial agent on the adhesive splitting tensile strength of RC-OC were examined.Two different particle sizes of rubber, five different dosages of rubber, and its composite modified rubberized concrete were prepared as new concrete to be poured on ordinary concrete bonded with three different interfacial agents.Results show that the effect of rubber particle size on the adhesive splitting tensile strength of RC-OC varied with the interfacial agent. With the increase of rubber particle dosage, the adhesive splitting tensile strength of RC-OC increased first and then decreased, and reached the maximum at a given dosage of rubber particle. The adhesive splitting tensile strength of both rubberized concrete and ordinary concrete were smaller than that of RC-OC as a whole. Cement paste interfacial agent had remarkable impact on the adhesive splitting tensile strength of both rubberized concrete and ordinary concrete rather than on RC-OC as a whole.Among the three interfacial agents, epoxy interfacial agent could give rise to a largest adhesive splitting tensile strength.Modification on rubber particle size could also enhance the adhesive splitting tensile strength.In summary, modified epoxy interfacial agent has better bonding effect, and could significantly improve the adhesive splitting tensile strength between rubber concrete and ordinary concrete.