DEVELOPMENT OF EVALUATION METHOD BY SMALL CORE SPECIMEN FOR DETERIORATED FIBER CEMENT CORRUGATED SHEET AND SOME RESULTS OF ROOFS OVER STATION PLATFORMS

Author(s): Ishihara, S. and Tanaka, K.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 150-157
Total Pages: 8
Language: English

Abstract: This paper studies the availability of deterioration assessment for fiber cement corrugated sheet with small core specimen. Normally, mechanical properties of fiber cement corrugated sheet are measured by bending test with one fiber cement corrugated sheet. However it requires a huge amount of effort to remove presently-used sheet. Therefore deterioration assessment with core specimen 10mm in diameter which can remove and patch after remove specimen easily was developed.

Small core specimens that had been exposed to weathering from 10 to 50 years were collected. Mechanical properties were tested with split-compression test and microstructure was observed by optical microscope and EPMA analysis.

Two types of fracture modes were observed on split-compression test, one is delamination which observed all specimens, and the other is splitting failure which observed a few specimens. Following the increase in past years, maximum load per specimen unit thickness measured by split-compression test and bending strength measured by bending test are decreased. Also, there is good correlation between maximum load per specimen unit thickness and bending strength.

Exact thickness was measured by optical microscope and element distribution was measured by EPMA analysis. Ca leaching was observed with long-term aging specimen which contributes to the deterioration.

It is concluded that it can evaluate of deterioration for fiber cement corrugated sheet with 10mm in diameter core specimens.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00