Practical Application of Structural Super Lightweight Aggregate Concrete

结构超轻骨料混凝土的实际应用

基本信息

批准号：
11555116
负责人：
NIWA Junichiro
金额：
$ 6.85万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555116/
关键词：
Super Lightweight Aggregate Prestressed Concrete Fracture Mechanics Fracture Energy Shear Resisting Capacity Size Effect Composite Structures Tension Softening Curve 複合構造形式斜め引張破壊

项目摘要

Recently, super lightweight artificial aggregates have been developed in Japan. The specific gravity is around 0.8 to 1.2, and the absorption ratio is less than 3.0%. The compressive strength is more than double of conventional artificial aggregates. In this research, the practical application of this structural super lightweight concrete (SLC) has been investigated.As the first step of this research work, fracture properties of SLC, and shear resisting capacities of reinforced and prestressed SLC beams have been investigated based on the experiments. As the result of this study, the following findings have been obtained. (1) The fracture energy of SLC is much lower than normal aggregate concrete having the same compressive strength level. The shear capacity of SLC beams also shows the same tendency. (2) The increase in the compressive strength of SLC does not provide the significant increase in the fracture energy. (3) To improve the shear resisting capacity, the mix of short fiber, s … More uch as polyvinyl alcohol short fiber, is very effective in the material viewpoint. The use of prestressing is also very effective to improve the shear capacity of SLC beams.As the second step, two countermeasures have been tried to improve the shear capacity of SLC beams. The first one is the intentional decrease in the compressive strength of SLC beams, and another one is the mixed use of super lightweight aggregates with normal aggregates, such as crushed stone. After the research work, it is confirmed that these two methods are quite effective regardless of the specific gravity of super lightweight aggregates. Finally, for the practical application of SLC, the trial design of SLC composite girders has been carried out. The aesthetic evaluation by using the computer graphics is also performed. From the trial design, SLC composite girders can reduce the dead weight of super structures to almost 50% of the conventional PC girders. SLC can provide the slender and smart concrete structures. Less

最近，日本已经开发了超轻质的人造骨料。比重约为0.8至1.2，抽象比小于3.0％。复杂的强度是常规人造骨料的两倍以上。在这项研究中，已经研究了这种结构性超轻质混凝土（SLC）的实际应用。作为这项研究工作的第一步，SLC的断裂特性，并根据实验研究了增强和预应力的SLC梁的剪切能力。作为这项研究的结果，已经获得以下发现。（1）SLC的断裂能比具有相同抗压强度水平的正常骨料混凝土低得多。 SLC梁的剪切能力也显示出相同的趋势。（2）SLC的抗压强度的提高不能提供断裂能量的显着增加。（3）为了提高抗剪切能力，在材料视图中，短纤维，s…更像聚乙烯基醇短纤维的混合物非常有效。预应力的使用也非常有效地提高SLC梁的剪切能力。在第二步中，已经尝试了两个对策，以提高SLC梁的剪切能力。第一个是SLC梁的抗压强度的故意降低，另一个是与正常聚集体的超轻质聚集体的混合使用，例如碎石。研究工作后，无论超轻质骨料的特定重力如何，这两种方法都非常有效。最后，对于SLC的实际应用，已经进行了SLC复合Gaters的试验设计。还进行了使用计算机图形学的美学评估。从试验设计中，SLC复合Gaters可以将超级结构的死重减少到几乎50％的常规PC梁。 SLC可以提供细长和智能的混凝土结构。较少的