陶瓷废料基绿色UHPGC力学性能及耐热性能分析

Analysis of the Mechanical Properties and Heat Resistance ofEnvironmentally-friendly Uhpgc Incorporating Ceramic Waste

超高性能混凝土UHPC已在众多领域得到了应用,但基于安全性和使用寿命考虑,对于以陶瓷废料代替细骨料的超高性能地聚合物混凝土UHPGC力学性能及耐热性能仍有待深入研究。文中设计制备了12种不同配合比的UHPGC试样,通过开展力学性能测试及耐高温测试,分析陶瓷颗粒、钢纤维掺量对UHPGC力学性能及耐热性能的影响。结果表明,UHPGC的流动度和流动直径随着细集料中陶瓷废料含量的增加而降低;高掺量陶瓷颗粒会缩短UHPGC的凝结时间;UHPGC的抗压性能随钢纤维掺量的增加而提高,添加陶瓷颗粒一定程度上会降低UHPGC的抗压性能,陶瓷颗粒含量22.5%的试样抗压强度降低了22.88%;利用陶瓷颗粒制备能够制备56 d强度超过120 MPa的UHPGC,同时保留混凝土的基本特性;含有细陶瓷骨料的UHPGC试样在600℃条件下具有较高的残余抗压强度;UHPGC混合料在700℃下具有热稳定性结构,而掺有陶瓷颗粒的混合料在600℃下具有稳定性。

Ultra-high-performance concrete(UHPC)has found applications in various fields.However,for ensuring safety and extending service life,there remains a need for comprehensive investigation into the mechanical properties and heat resistance of ultra-high-performance geopolymer concrete(UHPGC)utilizing ceramic waste as a replacement for fine aggregates.The design,preparation,and testing of 12 UHPGC specimens with varying mixing ratios were performed.The aim was to analyze the influence of ceramic particles and steel fiber admixture on the mechanical properties and heat-resistant performance of UHPGC through comprehensive mechanical and heat-resistant testing.The findings indicate that as the ceramic waste content in the fine aggregate increased,the flow degree and flow diameter of UHPGC decreased;a higher dosage of ceramic particles led to a reduction in the setting time of UHPGC;the compressive properties of UHPGC improved with increased steel fiber dosage,yet the addition of ceramic particles resulted in decreased compressive properties,with the compressive strength of the specimen containing 22.5%ceramic particles decreasing by 22.88%;utilizing ceramic particles in preparation enabled the production of UHPGC with a 56 day strength exceeding 120 MPa while preserving fundamental concrete properties;UHPGC samples incorporating fine ceramic aggregates exhibited significant residual compressive strength at 600℃;UHPGC mixes demonstrated a thermally stable structure at 700℃,whereas mixes with ceramic particle additives exhibited stability at 600℃.