废弃陶瓷骨料混凝土的力学性能和三维预测模型研究

为探索废弃陶瓷作为骨料在混凝土工程中的可行性,通过室内试验探讨了陶瓷粗、细骨料对混凝土力学性能的影响,研究了不同陶瓷骨料类型和掺量对混凝土抗压强度、抗折强度和弹性模量的影响,建立了考虑废弃陶瓷骨料掺量和类型的混凝土力学性能三维预测模型。研究结果表明,陶瓷粗骨料的内养护作用使混凝土弹性模量和抗压强度平均提高了10.42%~12.28%,而陶瓷细骨料的掺加使混凝土弹性模量和抗压强度平均降低了7.57%~13.88%。陶瓷粗、细骨料的掺加使混凝土抗折强度平均降低了7.24%~10.52%。另外,基于室内试验和国内外规范,得到了废弃陶瓷骨料混凝土力学性能与国内外规范的异同点。建立的三维预测模型适用于类似废弃陶瓷骨料混凝土的力学性能预测,在一定程度上提高了二维模型的精度。研究结果为废弃陶瓷骨料混凝土的设计和制备提供一定参考,为绿色环保型混凝土的发展提供了一些借鉴思路。

Mechanical Properties and Three-Dimensional Prediction Model of Waste Ceramic Aggregate Concrete

To explore the feasibility of waste ceramic as aggregate in concrete engineering, the effects of ceramic coarse and fine aggregates on the mechanical properties of concrete were discussed through laboratory tests. The effects of different types and contents of ceramic aggregates on the compressive strength, flexural strength and elastic modulus of concrete were studied. A three-dimensional prediction model of concrete mechanical properties considering the content and type of waste ceramic aggregates was established. The results show that the internal curing effect of ceramic coarse aggregate increases the elastic modulus and compressive strength of concrete by 10.42%~12.28% on average. And the addition of ceramic fine aggregate reduces the elastic modulus and compressive strength of concrete by 7.57%~13.88% on average. The addition of ceramic coarse and fine aggregates reduces the flexural strength of concrete by 7.24%~10.52% on average. Besides, the similarities and differences between the mechanical properties of waste ceramic aggregate concrete and domestic and foreign specifications were obtained based on laboratory tests and domestic and foreign specifications. The established three-dimensional prediction model is suitable for the prediction of mechanical properties of waste ceramic aggregate concrete, which improves the accuracy of its two-dimensional model to a certain extent. The results provide some reference for the design and preparation of waste ceramic aggregate concrete, and provide some new ideas for the development of green concrete.