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Study on the chemical prestressed shin panel with high expansive concrete

高膨胀混凝土化学预应力面板的研究

基本信息

批准号：
10650451
负责人：
YAMASAKI Takehiro
金额：
$ 2.3万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650451/
关键词：
Expansive Concrete Calcium Type Prestressed Concrete Permanent Form Pre cast Panel CFRP プレストレスコンクリート埋設型枠

项目摘要

The method of construction which uses the permanent form instead of an wood form and supports have begun to spread from the viewpoint of construction's safety, the quickness, making noiseless, and the environment measure in building, the forest environment protection at the earth scale and so on.The permanent form which uses a form just as it is as the body of concrete has high proof stress compared with the wood form, and makes the construction work possible without separation of the form from the concrete after casting.When making an permanent form from concrete, it is desirable to introduce a prestress from the viewpoint of the crack prevention due to the self shrinkage and the dry shrinkage or the reduction of weight of the member's cross section.For its purpose, the introduction of uniform prestress becomes important so as not to causes a deflection, using the carbon fiber meshes which is not rust even if it is thin cover.Making the PC panel by 2 directions prestress, a lot of CFRP tendons must be fixed by special pre tensioning method. To use such tensioning equipment, the advanced tensioning management became necessary, it examined the application of chemical prestressed concrete (CPC) which doesn't need the fixing equipment of the CFRP tendon in this study.When using a tendons with low elasticity coefficient, to make an effective pre stress big, it is necessary to tense in the CFRP tendons beyond 700 μ of strain which is prescribed with the concrete specification of JSCE.It examined experimentally from the aspect of durable-ness improvement by the material composition, the expansion mechanism, the expansion pressure, the mix proportion, the curing method, the degree of the restriction, and the polymer mixing about the pre stress introduction characteristic by CPC under such high expansion.

从施工安全、快捷、无噪音、建筑环保措施、地球尺度的森林环境保护等方面考虑，用永久模板代替木模板和支架的施工方法已开始推广。用模板作为混凝土主体的永久模板与木模板相比具有较高的极限应力，在用混凝土制作永久性模板时，从防止因自收缩和干收缩而产生的裂缝的观点出发，或者从减轻构件截面的重量的观点出发，优选施加预应力，为了不引起挠度，均匀预应力的引入变得很重要，使用即使是薄覆盖也不会生锈的碳纤维网，使PC板具有两个方向的预应力，必须通过特殊的预张拉方法固定大量的CFRP筋。为了使用这种张拉设备，先进的张拉管理成为必要，本研究探讨了化学预应力混凝土（CPC）的应用，它不需要CFRP筋的固定设备，当使用低弹性系数的筋时，为了使有效预应力大，根据JSCE混凝土规范的规定，CFRP筋的张拉应变必须超过700 μ。从材料组成、膨胀机理、膨胀压力、配合比、养护方法、约束程度、聚合物混合等方面对CPC在高膨胀下的预应力导入特性进行了改善。