Study on Static and Fatigue Behavior of Reinforced Concrete Member with Low Quality Aggregate and its Effective Utilization

低质量骨料钢筋混凝土构件静力疲劳性能研究及有效利用

基本信息

批准号：
17560407
负责人：
INOUE Shoichi
金额：
$ 2.24万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560407/
关键词：
Decomposed granite Melting Slag from Municipal Solid Waste Waste roof tile Alkali-Aggregate Reaction Mix proportion Drying Shrinkage Freeze-thaw Resistance Fatigue Strength まさ土配台設計低品質骨材

项目摘要

In this study, the decomposed granite, melt-solidified slag aggregate for concrete derived from municipal solid waste, and waste roof tiles were selected as a low quality aggregate and the properties of fresh and hardened concrete with low quality aggregate were investigated. Subsequently the properties of static and fatigue strength and deformation of reinforced concrete beams (RC beams) made of concrete with the mentioned above aggregate were also investigated.The test results of fresh concrete show that the dosage of a retardar type of air-entraining high-range water reducing agent required to attain the given slump when either the decomposed granite or the waste roof tiles are used as fine aggregate for concrete. The fundamental properties of concrete with a low quality aggregate such as slump and air loss with time, bleeding, setting time, compressive strength and drying shrinkage are almost the same as those of ordinary concrete with normal sand. However, the freeze-thaw resistan … More ce of concrete with low quality aggregate except for the decomposed granite drop away compared with that of concrete with normal sand.In second study, strength and deformation properties of RC beams made of concrete with mentioned above low quality aggregate were investigated. The factors adopted for reinforced concrete beams are amount of reinforcement, with or without web reinforcement and loading patterns (one is unidirectional cyclic loading and another is reversed cyclic loading with three load repetitions at each deflection amplitude). The test results show that the strength such as flexural capacity and shear capacity for the RC beam manufactured by concrete with low quality aggregate can be calculated with a considerable accuracy by the view given in JSCE's Specification. The crack width and deflection of RC beams with low quality aggregate are almost the same as those of ordinary RC beam with normal sand.Third study examined fatigue characteristics of the plain concrete and the RC beams with a MSW (Melt-solidified slag aggregate for concrete derived from municipal solid waste) and examined the possibility of its utilization as coarse aggregate for concrete. The test results show that (1) the distribution of fatigue life of both plain concrete and RC beam made of concrete with MSW was confirmed to the logarithmic normal distribution as well as ordinary concrete, (2) the fatigue compressive strength at 2X10^6 cycles for the plain concrete with MSW is smaller by 4 % than that of ordinary concrete. With RC beam, (1) the fatigue strength at 2X10^6 cycles for RC beam with MSW is almost is almost equal to that of RC beam with ordinary concrete, (2) the increase of crack width or deflection under repeated loading of RC beam with MSW is almost the same as those of ordinary concrete RC beam. Less

本研究选择了风化花岗岩、来自城市固体废物的熔融凝固混凝土骨料和废弃屋顶瓦作为低质量骨料，并对低质量骨料的新拌混凝土和硬化混凝土的性能进行了研究。对采用上述骨料的混凝土制成的钢筋混凝土梁（RC梁）的静力强度、疲劳强度和变形进行了研究。新拌混凝土试验结果表明，缓凝型引气高效减水剂的掺量当风化花岗岩或废弃屋顶瓦用作混凝土细骨料时，达到给定坍落度所需的试剂低质量骨料混凝土的基本性能，如随时间的坍落度和空气损失、泌水、凝结时间、压缩性。强度和干燥收缩与普通砂混凝土基本相同，但除风化花岗岩外的低品质骨料混凝土的抗冻融能力较普通砂混凝土有所下降。在第二项研究中，研究了由上述低质量骨料制成的混凝土梁的强度和变形特性，钢筋混凝土梁采用的因素是配筋量、有或没有腹筋以及加载模式（一种是单向循环）。试验结果表明，用低质量骨料制成的RC梁的抗弯承载力和抗剪承载力等强度可以通过以下公式相当准确地计算出来。观点JSCE 规范中给出的使用低质量骨料的 RC 梁的裂缝宽度和挠度与使用普通砂的普通 RC 梁的裂缝宽度和挠度几乎相同。第三项研究检查了普通混凝土和使用 MSW（熔体-试验结果表明：（1）普通混凝土和钢筋混凝土梁的疲劳寿命分布。 MSW 与普通混凝土一样呈对数正态分布，(2) 含有 MSW 的素混凝土在 2X10^6 次循环时的疲劳抗压强度比普通混凝土梁的疲劳抗压强度小 4%，(1)。 MSW RC梁2X10^6次循环的疲劳强度几乎与普通混凝土RC梁相当，（2）MSW RC梁在重复荷载作用下裂缝宽度或挠度的增加与普通混凝土RC梁几乎相同。