宁夏大学学报（自然科学版）2023，Vol.44Issue(4)：328-338,11.
无配筋机制砂UHPC井盖受力性能试验研究
Experimental Study on Mechanical Performance of Machine-Made Sand UHPC Manhole Cover without Reinforcement
摘要
Abstract
Using machine-made sand instead of quartz sand,low carbon,environmental protection and relatively low cost UHPC can be prepared.The application of machine-made sand UHPC in class A manhole cover structure has the characteristics of high strength,high toughness,high abrasion resistance and high durability,and it is free of reinforcement process,high construction efficiency and late maintenance free,which has good engineering application prospect.In this paper,the proportion design and basic mechanical properties of machined sand UHPC are studied,and the model test,numerical simulation calculation and economic benefit analysis of machined sand UHPC manhole cover without reinforcement are carried out.The results show that with the increase of water-binder ratio,the compressive strength and elastic modulus of UHPC decreases gradually,and the tensile strength increases first and then decreases.When the content of stone powder increases gradually,the compressive/tensile strength and elastic modulus increase first and then decrease.With the increase of fineness modulus and steel fiber content,the compressive/tensile strength and elastic modulus are improved,but the increase amplitude is gradually slow.When steel fiber is not added,the manhole cover exhibits brittle failure.When steel fiber is added,the overall stiffness and ductility of the manhole cover are increased due to the significant crack resistance effect of steel fiber,showing obvious elastic-plastic failure characteristics.With the increase of steel fiber,the crack load and failure load of manhole cover increase gradually,but the increase amplitude gradually becomes slow.Compared with traditional UHPC manhole cover,ductile iron manhole cover,ordinary steel fiber concrete manhole cover,the cost of UHPC manhole cover without reinforcement mechanism sand can be saved by 11％～66％;The design parameters of 20mm thickness,400mm～600mm diameter and 2％steel fiber content can be adopted for UHPC manhole cover without reinforcement mechanism sand to meet the force requirements of class a manhole cover.关键词
机制砂UHPC/井盖/无配筋/受力性能/数值模拟/经济性Key words
machine-made sand of UHPC/manhole cover/without reinforcement/mechanical performance/numerical modeling/economy分类
建筑与水利引用本文复制引用
杨益伦,吴庆雄,陈智威,林建茂..无配筋机制砂UHPC井盖受力性能试验研究[J].宁夏大学学报（自然科学版）,2023,44(4):328-338,11.基金项目
国家自然科学基金资助项目(51878178) （51878178）
