Journal of the Japan Society of Erosion Control Engineering,
Vol.57,No.4,,2004
Freeze]thaw resistance and use of poor quality construction material
Kazuki MATSUMURA, Keita HIGUCHI, Yoshihiro IWAMOTO
Abstract
Cemented sand and gravel (C.S.G) or Sabo soil cement is of a nature different from that of concrete. This paper describes a freezing]thawing test conducted using a poor quality construction material that was made of crusher]run and cement and had varying levels of strength. The objective of the test was to identify the freeze]thaw resistance of construction materials poorer in quality than concrete. The freezing]thawing test was conducted based on JIS A 1148 that is classified into two categories according to the method of freezing]thawing: test A (underwater freezing ]thawing test) or test B (atmospheric freezing]thawing test). And primary resonance frequency and mass were measured and relative dynamic modulus of elasticity and rate of reduction in mass were calculated. Durability factor (DF) was also calculated by these results. DF increased only slightly while compressive strength increased in test A. In test B, freeze]thaw resistance improved greatly with the increase of compressive strength. It was confirmed in the freezing]thawing test that the freeze]thaw resistance in test B was approximately ten times greater than that in test A as long as the same mix proportion was applied. The results of tests A and B, despite mutual difference between themselves, are almost in agreement with existing test results for IN]situ Stabilized Excavation Method (INSEM ) materials with a zero slump.
Key words:freezing]thawing test, poor quality construction material, primary resonance frequency
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