The authors have carried out the experiments to identify the effects on fluidity, resistance to segregation, strength, Young’s modulus, dry shrinkage and durability of high-strength concrete when unit water content was varied in high-strength concrete while unit bulk volume of coarse aggregate was fixed, or the volumetric ratios of cement paste and fine aggregate were varied. As a result of the experiments, it is assumed that slightly increased unit water content in the range between 5 to 10 kg/m 3 in high-strength concrete with fixed unit bulk volume of coarse aggregate will improve construction performance without great affection of the quality parameters while the deterioration of the parameters has been afraid when unit water content was increased. Keywords : High-Strength Concrete 㸪Unit Volume of Water 㸪Bulk Volume of Coarse Aggregate Per Unit 㸪 Property㸪Workability 㸪Air-Entraining and High-Range Water-Reducing Admixture 㧗ᙉᗘࢥࢡࢺ㸪༢Ỉ㔞㸪༢⢒㦵ᮦࡉᐜ✚㸪ᛶ㉁㸪ࢸ㸪㧗ᛶ⬟ AE ῶỈ 㸯㸬ࡌࡣ2000 ᖺᘓ⠏ᇶ‽ἲࡀᨵṇࡉ㸪ᘓ⠏ᇶ‽ἲ➨ 37 ᮲㕲➽ ࢥࢡࢺ㐀ᘓ⠏≀ࡢせᵓ㐀㒊ᮦ⏝࠸ࢥࢡࡣࢺ㸪 JIS A 5308 㐺ࡍࡢᅜᅵ㏻⮧ࡀᢏ⾡ⓗᇶ‽᭩ࡢ㐺 ㄆᐃࡓࡋࡢ㸦௨ୗ ࠊ⮧ㄆᐃရ ࠋ࠺࠸㸧ࡇࠋࡓࡗ࡞క ࠸㸪タィᇶ‽ᙉᗘ 36N/mm 2 ㉸࠼㧗ᙉᗘࢥࢡࡣࢺ⮧ㄆ ᐃရࡀὶ࡞㸪2014 ᖺ࠸࠾JIS ㄆドᕤሙ 1) 2,997 ᕤሙ ࡢࡕ࠺㧗ᙉᗘࢥࢡࡢࢺ༢⊂⏦ㄳᕤሙ 2) ࡀ583 ᕤሙ ࠋࡓࡗ࡞ࡢࡇ㧗ᙉᗘࢥࢡࡢࢺရ㉁ࡣ㸪 ࠕᘓ⠏ᕤᶆ‽ᵝ᭩ JASS 5 㕲➽ࢥࢡ㸫ࢺᕤ 3) 㸦௨ୗ㸪JASS 5 ࠺࠸㸧ࠕࡢ17 ⠇ 㧗 ᙉᗘࢥࢡ ࢺ17.3 ရ㉁࠸࠾ࠕࢩࢥࢡ ࢺࡣ㸪㐺ᗘ࡞ὶᛶ᭷ࡋ㸪ᮦᩱศ㞳⏕ࡎࡇࡃ࡞ࡀᆺᯟෆᐦ ᐇᡴࡕ㎸ࡇࡀࡁࡢࡍ ࠋグ㏙ࡉ࠸࡞ࡍࠋࡕ㸪㧗ᙉᗘࢥࢡࢺࠕ3.6 ࢸᵝࡢᛶ⬟ ‶㊊ࡍᚲせ࠶ࡀࡋࡔࡓࠋ㸪ࡢࡇ㧗ᙉᗘࢥࢡࡢࢺࢸࡣ㸪 ࢥࠕࢡࡣࢺᅽ⦰ᙉᗘࡀ㧗࡞ࡃపỈࢭ࣓ ࢺẚ࡞㸪ࢭ࣓ࢺ㔞ࡀቑ࠼㸪⢓ᛶࡀ㧗ࡃᮦᩱศ㞳ࡋࢥ࠸ࡃࢡࢺ࡞ࠋ㠃㸪⢓ᛶࡀ㧗ࡇ࠸ὶᛶሸᛶࡀపୗ ࡓࡋ㸪ᅽ㏦㈇Ⲵࡢቑ࡞ࢸࡀᦆ࡞ࡇ࡞ ࠋゎㄝࡉ㸪ࢸࡢၥ㢟Ⅼᣦࡋ࠸ ࠋࡉ㸪 ࡢࡇ㧗ᙉᗘࢥࢡࡢࢺㄪࡣ㸪 JASS 5 ࠕࡢ17.5 ㄪ ࠸࠾ࠕィ⏬ㄪ ࡣ17.3 ♧ࡍရ㉁‶㊊ࡋ㸪タィࡀせồ ࡍᵓ㐀యࡢᛶ⬟ࡀᚓ࠺㸪ヨࡋ⦎࠾ࡧᕤヨ㦂 ࡗᐃ㸪ᕤ┘⌮⪅ࡢᢎㄆࡅ ࠋグ㏙ࡉ㸪ィ⏬ㄪ ࡅ࠾ᶆ‽ⓗ࡞ࡋ༢Ỉ㔞 175kg/m 3 ௨ୗ㸦 185kg/m 3 ௨ୗ㸧㸪༢ࢭ࣓ࢺ㔞ࡁࡅࡔᑠ࡞ࡉ࠾ࡧ༢ ⢒㦵ᮦ㔞Ⰻዲ࡞ࢸࡀᚓࡍࡇ࡞ ࡀゎㄝࡉ࠸ࡇࠋࡣ㸪ࢥࢡࡢࢺㄪタィࡢཎ 4) ᇶ ࡇࡓ࠸⪃࠼ࡇࡢࡇࠋ㸪㧗ᙉᗘࢥࢡࡢࢺ༢Ỉ㔞ࡣ㸪㛵ᮾᆅ༊ࡢࢹࢥࢺࢫࢡࢡࢺᕤሙ ࡢㄪᰝ 5) 㸪༢Ỉ㔞 175kg/m 3 ௨ୗࡁࡅࡔᑠ ࡍࡃࡉഴ࠶㸪ࡧࢫࡢ࠾ࢫࡧࡈ༢ Ỉ㔞ᐃࡋ࠸ഴࡀぢࡓࡢࡑࠋ㸪㧗ᙉᗘࢥࢡࡢࢺࢸࡣ㸪ศ㞳ᢠᛶ᭷ࡋ࠸ࡢࡢ㸪⢓ᛶ ࡀ㧗࡞ࡃᕥᐁࡆᛶ࡞ࡢᕤᛶ⬟పୗࡏࡉᵓ㐀యࢥࢡ単位水量の変化が単位粗骨材かさ容積を一定とした 高強度コンクリートの性質に及ぼす影響の一考察 INFLUENCE ON THE PROPERTIES OF HIGH-STRENGTH CONCRETE BY THE CHANGE OF UNIT WATER AT FIXED BULK VOLUME OF COARSE AGGREGATE 中田善久 ＊1 ，斉 藤 丈 士 ＊2 ，梶 田 秀 幸 ＊3 ，大 塚 秀 三 ＊4 ，春 山 信 人 ＊5 Yoshihisa NAKATA, Takeshi SAITO, Hideyuki KAJITA, Shuzo OTSUKA and Nobuhito HARUYAMA ＊1 日本大学理工学部建築学科 教授・博士（工学） ＊2 日本大学生物資源科学部生物環境工学科 准教授・博士（工学） ＊3 前田建設工業㈱技術研究所 材料研究室長 ＊4 ものつくり大学技能工芸学部建設学科 准教授・博士（工学） ＊5 フジミ工研㈱ Prof., Dept. of Architecture, College of Science and Technology, Nihon University, Dr. Eng. Assoc. Prof., Dept. of Bioenvironmental and Agricultural Engineering, College of Bioresource Science, Nihon University, Dr. Eng. Construction Material Laboratory Manager, Technical Research Institute, MAEDA Corporation Assoc. Prof., Dept. of Building Technologists, Monotsukuri Institute of Technologists, Dr. Eng. Fujimi Koken Co., Ltd. 日本建築学会構造系論文集 第82巻 第738号， 1145-1154， 2017年8月 J. Struct. Constr. Eng., AIJ, Vol. 82 No. 738, 1145-1154, Aug., 2017 DOI http://doi.org/10.3130/aijs.82.1145 【カテゴリーⅡ】 ─ 1145 ─
Transcript
INFLUENCE ON THE PROPERTIES OF HIGH-STRENGTH CONCRETE
BY THE CHANGE OF UNIT WATER AT FIXED BULK VOLUME OF COARSE AGGREGATE
The authors have carried out the experiments to identify the effects on fluidity, resistance to segregation, strength, Young’s modulus, dry shrinkage and durability of high-strength concrete when unit water content was varied in high-strength concrete while unit bulk volume of coarse aggregate was fixed, or the volumetric ratios of cement paste and fine aggregate were varied. As a result of the experiments, it is assumed that slightly increased unit water content in the range between 5 to 10 kg/m3 in
high-strength concrete with fixed unit bulk volume of coarse aggregate will improve construction performance without great affection of the quality parameters while the deterioration of the parameters has been afraid when unit water content was increased.
Keywords : High-Strength Concrete Unit Volume of Water Bulk Volume of Coarse Aggregate Per Unit Property Workability Air-Entraining and High-Range Water-Reducing Admixture
AE
2000 37
JIS A 5308
36N/mm2
2014 JIS 1) 2,9972) 583
JASS 5 3) JASS 5 17
17.3
3.6
JASS 5 17.5
17.3
175kg/m3
185kg/m3
4)
5) 175kg/m3
*1 Prof., Dept. of Architecture, College of Science and Technology, Nihon University, Dr. Eng.
*2
Assoc. Prof., Dept. of Bioenvironmental and Agricultural Engineering College of Bioresource Science, Nihon University, Dr. Eng.
*3
Construction Material Laboratory Manager, Technical Research Institute, MAEDA Corporation
*4
Assoc. Prof., Dept. of Building Technologists, Monotsukuri Institute of Technologists, Dr. Eng.
*5 Fujimi Koken Co., Ltd.
単位水量の変化が単位粗骨材かさ容積を一定とした 高強度コンクリートの性質に及ぼす影響の一考察
INFLUENCE ON THE PROPERTIES OF HIGH-STRENGTH CONCRETE BY THE CHANGE OF UNIT WATER AT FIXED BULK VOLUME OF COARSE AGGREGATE
Prof., Dept. of Architecture, College of Science and Technology, Nihon University, Dr. Eng.Assoc. Prof., Dept. of Bioenvironmental and Agricultural Engineering, College of Bioresource Science, Nihon University, Dr. Eng.Construction Material Laboratory Manager, Technical Research Institute, MAEDA CorporationAssoc. Prof., Dept. of Building Technologists, Monotsukuri Institute of Technologists, Dr. Eng.
*1 Prof., Dept. of Architecture, College of Science and Technology, Nihon University, Dr. Eng.
*2 Assoc. Prof., Dept. of Bioenvironmental and Agricultural Engineering College of Bioresource Science, Nihon University, Dr. Eng.
*3 Construction Material Laboratory Manager, Technical Research Institute,MAEDA Corporation
*4 Assoc. Prof., Dept. of Building Technologists, Monotsukuri Institute of Technologists,Dr. Eng.
*5 Fujimi Koken Co., Ltd.
The authors have carried out the experiments to identify the effects on fluidity, resistance to segregation, strength, Young’s modulus, dry shrinkage and durability of high-strength concrete when unit water content was varied in high-strength concrete while unit bulk volume of coarse aggregate was fixed, or the volumetric ratios of cement paste and fine aggregate were varied. Three types of cement, ordinary Portland cement, moderate-heat Portland cement and low-heat Portland cement,
were used. Limestones were adopted as coarse aggregate. Water-cement ratio was varied with 45, 35 and 25%. Analysis were carried out in concern with properties of fresh concrete, properties of concrete hardening, and
properties of hardened concrete where unit water content was varied. When water-cement ratio was 35%, changes in the properties of high-strength concrete with hard sandstones used as
coarse aggregate owing to the increase of unit water content were also examined. As a result of the experiments, it was found that increasing of the water content caused no segregation of materials,
facilitation of handling, reducing of changes in the retention of slump and slump flow, increasing of flow velocity in L-box tests and increasing of bleeding only slightly. Few effects were observed on the initial properties and on the properties of hardened concrete. Based on the above, it is assumed that slightly increased unit water content in the range between 5 to 10 kg/m3 in
high-strength concrete with fixed unit bulk volume of coarse aggregate will improve construction performance without great affection of the quality parameters while the deterioration of the parameters has been afraid when unit water content was increased.
INFLUENCE ON THE PROPERTIES OF HIGH-STRENGTH CONCRETE BY THE CHANGE OF UNIT WATER AT FIXED BULK VOLUME OF COARSE AGGREGATE
＊1 Prof., Dept. of Architecture, College of Science and Technology, Nihon University, Dr. Eng. ＊2 Assoc. Prof., Dept. of Bioenvironmental and Agricultural Engineering, College of Bioresource Science, Nihon University, Dr. Eng.
＊3 Construction Material Laboratory Manager, Technical Research Institute, MAEDA Corporation ＊4 Assoc. Prof., Dept. of Building Technologists, Monotsukuri Institute of Technologists, Dr. Eng.
![WEB EDITION SENSUS NAVIGATION...f j K r M > x4(2 d ^ ]2n/ _ s8j l p M > Q b 6 1ß >%± } O K æ p b Ý î º /² &g K r M &ì 8 B K S ~ Ý î º V b « Ï µ º _ 32, è(ô K S ~ ¼](https://static.documents.pub/doc/80x56/5ecd93f31bacf547183c7e59/web-edition-sensus-navigation-f-j-k-r-m-x42-d-2n-s8j-l-p-m-.jpg)
