Study on the Test Method Using Thin Mortar Specimens for Sulfate Resistance

【Author】

Shunsuke Hanehara;Tetsuya Oyamada;Atsushi Kuboyama;

【Abstract】

<正>This study investigated a test method to evaluate sulfate attack using molds for mortar specimens(40×40×160 mm) in accordance with JIS R 5201 Physical Testing Methods for Cement.For the mortar specimen dimensions,the immersion time and expansion length were studied,changing the 40-mm thickness of the mortar to 10,15,20,and 25 mm with stainless steel spacers.The smaller the croSs-sectional area perpendicular to the long axis,as in the case of the thin specimens,the earlier the initiation of expansion and the higher the expansion rate were.There is a relationship between the equivalent circular radius of the cross section and the material age at which the expansion rate of 0.05%is reached,and the equivalent circular radius is proportional to the cubic root of the material age at which the expansion rate of 0.05%is reached.Agreement was found between the ASTM C 1012 mortar preparation method(mix proportions and material age) and the method proposed in this paper,and the method proposed in this paper, which has the merits of greater ease and convenience,is deemed to be employable,it was determined that specimens of 10 mm and 15 mm thickness are compatible with the testing time specified in ASTM C1012-2010. Originality The Sulfate attack begins with the penetration and ingress of sulfate ions from the outside,causing(he formation of ettringite,and judging from the resulting axial expansion,it is surmised that the cross-sectional area of the plane perpendicular to the long axis is involved This study investigated the effect of changing the cross-sectional area perpendicular to the long axis using stainless steel spacers and JIS mortar specimen molds.Agreement was found between the ASTM C 1012 mortar preparation method(mix proportions and material age) and the method proposed in this paper,and the method proposed in this paper,which has the merits of greater ease and convenience, is deemed to be employable.The 15-mm mortar specimens created using the mix proportions proposed in this study can be applied in a similar manner to the specimens stipulated in the ASTM C 1012 standard.

【Keywords】

suphate resistance;;expansion;;test method;;ASTM C 1012;;sodium sulfate;;durability

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