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No. 18 (1979/11) >

Title :塩分及び防錆剤等がコンクリートの諸性質に及ぼす影響
Title alternative :Effects of Salt and Corrosion Inhibitors on Concrete properties
Authors :具志, 幸昌
和仁屋, 晴讙
伊良波, 繁雄
Authors alternative :Gushi, Yukimasa
Waniya, Haruyoshi
Iraha, Shigeo
Issue Date :Nov-1979
Abstract :The authors have performed a series of experiments on corrosion behavior of steel bars embedded in concrete. In these experiments many types of corrosion inhibitors and a variety of quantities of salt were added to concrete. The chemicals seemed to have influences on the physical behaviors and compressive strength of concrete. Although the measurements of strength and physical properties of concrete were not intended in these experiments and results obtained on those items were secondary minors, the authors have had much materials about them. So, some of them are to be described in the following. (1) Favorable effects of using commercial-made corrosion inhibitors on concrete strength were observed in the experiments. (2) The effects of salt contents in concrete on the 28th-day concrete strength were somewhat complex phenomenon. On the average adding salt into concrete caused a little lower strengths, there observed the minimum strength at the concentration of NaCl in concrete between 0.03% and 0.15%, then increasing tendency of strength could be seen until salt content increased to 0.25% which corresponded to the concentration of NaCl in sea-water mixing concrete. Thereafter the more NaCl concentration in the concrete, lower the strength ensured. (3) The effect of salt dosage in concrete mixing on slump value was small. But tendency that larger concentration caused less slump was observed. (4) The influence of the types of corrosion inhibitors on slump value was not significant in the analysis of variance except the one containing water-reducing agent. (5) It was found that water-cement ratio had most significant effect on slump value except the effect of unit water in concrete. (6) The less bleeding water was brought about as salt dosage become larger. But the salt content not more than the one resulted from using the ordinary sea-sand would not so much effective. (7) Some types of corrosion inhibitors seemed to be effective on bleeding behavior of concrete. (8) On the dosage of salt in concrete or cement paste, the accelerating effect on setting could be observed. (9) Most of the inhibitors used in the experiments had some compensating effects for the above of salt dosage.
Type Local :紀要論文
ISSN :0389-102X
Publisher :琉球大学工学部
URI :http://hdl.handle.net/20.500.12000/17709
Citation :琉球大学工学部紀要 no.18 p.25 -36
Appears in Collections:No. 18 (1979/11)

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