Axial Behavior of Short Square Columns Cast in Permanent Formworks

Abstract

The purpose of this paper is to study the axial behavior of square-section reinforced concrete columns cast in permanent formworks. The permanent formworks can be purchased from leading building materials stores. Size of selected permanent formwork is 21x21x86 centimeter with 2 centimeters thick. This size of permanent formwork is suggested from the manufacturer for using to replace the column size 20x20 centimeter that cast by temporary formworks. This study performs axial loading tests of 4 groups of columns, i.e., 1. Square column 20x20 centimeter cast by temporary formworks, 2. Square column 17x17 centimeter cast by temporary formworks, 3. Square column 21x21 centimeter cast by permanent formworks, and 4. Permanent formworks without concrete infilled. Each group of columns consists of 5 specimens. Axial loads are recorded together with column shortening and lateral expansion of column. Moreover, the stirrup expansion also is recorded in order to investigate axial behavior and lateral expansion of the columns. The results show that the axial capacity of the column with permanent formworks is significantly less than those of the columns cast by temporary formworks.