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

在这项研究中，风化花岗岩，熔融固化矿渣骨料混凝土来自城市生活垃圾，和废屋面瓦被选为低品质的骨料和新的和硬化混凝土的性能与低品质的骨料进行了研究。试验结果表明，以风化花岗岩或废屋面瓦为细骨料配制混凝土，缓凝型高效引气减水剂的掺量均能达到混凝土的坍落度要求。低质量骨料混凝土的基本性能，如坍落度和随时间的空气损失，泌水，凝结时间，抗压强度和干燥收缩几乎与普通砂混凝土相同。然而，冻融抗性 ...更多信息 研究结果表明，与普通砂混凝土相比，低品质骨料混凝土的抗弯强度和抗弯变形能力均有所下降，但花岗岩风化程度有所降低。钢筋混凝土梁采用的因素是钢筋量，有或没有腹板钢筋和加载模式（一个是单向循环加载，另一个是反向循环加载，每个挠度幅值重复三次）。试验结果表明，采用低骨料混凝土制作的钢筋混凝土梁，其抗弯承载力和抗剪承载力可以按JSCE规范的观点进行计算，具有相当的精度。低质量骨料混凝土梁的裂缝宽度和挠度与普通砂混凝土梁的裂缝宽度和挠度基本相同。第三项研究考察了素混凝土和掺城市固体废弃物的混凝土用熔融固化矿渣骨料混凝土梁的疲劳特性，并考察了其作为混凝土粗骨料的可能性。试验结果表明：（1）素混凝土和掺MSW混凝土梁的疲劳寿命与普通混凝土一样均服从对数正态分布;（2）掺MSW混凝土的2 × 10^6次疲劳抗压强度比普通混凝土低4%。在2 × 10^6次循环下，MSW加固钢筋混凝土梁的疲劳强度与普通混凝土梁的疲劳强度基本相同;在重复荷载作用下，MSW加固钢筋混凝土梁的裂缝宽度和挠度的增加量与普通混凝土梁的裂缝宽度和挠度的增加量基本相同。少

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