| This paper presents an experimental study on the alkaline resistance of pultruded glass fiber reinforced polymers (GFRP) profile in outdoor exposure and immersion tests in order to obtain fundamental data for developing a test method for pultruded GFRP subjected to an alkaline action. An outdoor exposure test from 6 to 19 months at Tsukuba which has a moderate climate in Japan and immersion tests (an alkaline solution and water ) with different immersion time (31, 59, 91 days) and temperatures (20 and 40℃) for pultruded GFRP profile were conducted. Two types of specimens with/without infilled mortar were employed in the tests. The outdoor exposure test reduced the tensile strength of GFRP to about 60 % of the initial tensile strength. It is confirmed that results of the following two conditions of the immersion tests seem to correspond to those of the outdoor exposure test for 11 months: 1) specimen without infilled mortar immersed to an alkaline solution for 31days at 20℃, 2) specimen with infilled mortar immersed to water for 91days at 20℃. |
