废瓷砖再生骨料对砂浆及砼性能的影响

利用废弃瓷砖制备再生粗、细骨料以取代天然砂石,研究了废瓷砖再生骨料对砂浆、混凝土性能的影响;并通过劈裂实验及抗折实验,对比分析了再生骨料、天然碎石与水泥石的界面粘结性能.结果表明:在相同配比条件下,与天然砂石集料相比,废瓷砖再生骨料有利于提高砂浆、混凝土的强度,减小干缩率,但会导致工作性变差.在相同龄期条件下,不同类型骨料-水泥石的界面粘结强度均随水灰比的降低而增大.在相同水灰比条件下,废瓷砖再生骨料-水泥石界面28 d劈裂强度、抗折强度均较碎石-水泥石界面的要大,表明再生骨料-水泥石界面粘结性能更好.

Effect of Waste Ceramic Tile Recycled Aggregate on Mortar and Concrete

Using waste ceramic tile as recycled coarse and fine aggregate to replace natural aggregate, effects of waste ceramic tile recycled aggregate on the performance of mortar and concrete were studied.Interfacial bonding properties of recycled aggregate and cement paste were measured by splitting test and bending test compared to natural aggregate.Results show that under the same mix proportion, waste tiles recycled aggregate improve compressive strength, reduce dry shrinkage and slump of concrete compared to natural aggregate.Under the same curing age condition, interfacial bond strength of different types of aggregate-cement pastes increase with the decrease of water to cement ratio.Under the same water cement ratio, the fracture strength and flexural strength at 28 d of the recycled aggregate-cement stone interface is higher than that of natural aggregate-cement stone interface.It is revealed that the performance of the interface between the recycled aggregate and cement paste is better than that of natural aggregate.