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

在这项研究中，分解的花岗岩，融化的熔融植物骨料是源自市政固体废物的混凝土，并选择了废物屋顶瓷砖作为低质量骨料，并研究了具有低质量聚集物的新鲜和硬化混凝土的特性。随后，还研究了与上述骨料制成的混凝土制成的静态和疲劳强度以及钢筋混凝土束（RC束）的变形的性能。新鲜混凝土的测试结果表明，当分解的花岗岩或废物屋顶瓷砖被用作混凝土的细骨料时，需要达到给定的倒塌的延迟类型的延迟类型的高量水还原剂的剂量。混凝土的基本特性具有低质量的聚集体，例如随时间，出血，设定时间，抗压强度和干燥的收缩，几乎与普通混凝土的基本特性相同。然而，除了与正常砂的混凝土相比，冻结抗药性……质量低的混凝土含有低质量的混凝土。在第二次研究，由混凝土制成的RC梁的强度和变形特性中，研究了上述低质量骨料的强度和变形特性。钢筋混凝土梁采用的因素是加固的量，有或没有网络加固和加载模式（一个是单向循环载荷，而另一个是在每个偏转放大器上带有三个负载重复的循环加载）。测试结果表明，可以通过JSCE规范中给出的观点来计算混凝土制造的RC梁的柔性能力和剪切能力之类的强度。具有低质量聚集体的RC梁的裂纹宽度和挠度几乎与普通RC光束的裂纹宽度相同。三分之二的研究检查了普通混凝土的疲劳特性和带有MSW的RC梁（MSW的RC梁（熔体溶解的炉渣骨料，用于从市政固体浪费中得出的混凝土），并检查了其uniCATE的可能性。测试结果表明，（1）与对数正态分布以及普通混凝土的混凝土和MSW混凝土制成的疲劳寿命的分布以及普通混凝土在2x10^6循环中的疲劳抗压强度相比，MSW的疲劳抗压强度在2x10^6循环中比普通混凝土小于普通混凝土。使用RC梁，（1）使用MSW的RC梁在2x10^6循环下的疲劳强度几乎等于带有普通混凝土的RC梁，（2）在用MSW重复加载RC束下的裂纹宽度或偏转的增加几乎与普通混凝土RC的RC束几乎相同。较少的