Abstract—The purpose of this study is to investigate the effect of Calcium Nitrite based accelerators concentrated 45% weight, pre-curing time and steam curing temperature on the strength gain of mortar, in the early and later age. Hence an experimental investigation was conducted to determine the optimum dosage of mentioned accelerators, and proper pre-curing time. Tests were performed on the specimens from various mixes considering to the W/C ratio 30% and 40%. Accelerator admixture was added in four series (0, 0.5, 2 and 4) %, steam curing temperature was 65C°, and the pre-curing times were two patterns (pattern1 = 0.5 (hr) and the pattern2= 2.5(hr). Curing time was equal to both patterns that’s 5 (hr). The compressive strength test has been performed on the early age (8, hr), and later age (7 and 28) days, the obtained result compared with the strength of control specimens. To make the better fluidity, water reducing admixture was added by 0.5% weight of cement. From the result of the experiment, it has been observed that high strength for early and later ages obtained for the specimens that made with 4% accelerator admixture and exposed to the longer pre-curing cycle.
Index Terms—Calcium nitrite, accelerator admixture, steam curing temperature, mortar, pre-curing cycle, compressive strength.
Abdul Ahmad Malikyar, Nozomi Nakajima, and Shigeyuki Date are with Tokai University/Civil Engineering Department, 4-1-1 Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan (e-mail: ahmad_ahmad2793@yahoo.com, hayabusa_ripobitann_0613@yahoo.co.jp, sadt@tokai-u.jp).
Yuhji Sudoh is with Nissan Chemical Industries, Ltd. /Basic Chemical Department, 3-7-1, Kanda-Nishiki-Cho, Chiyoda-Ku, Tokyo 101-0054, Japan (e-mail: sudouyuuji@nissanchem.co.jp).
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Cite: Abdul Ahmad Malikyar, Yuhji Sudoh, Nozomi Nakajima, and Shigeyuki Date, "Influence of Calcium Nitrite Based Accelerator, Steam Temperature and Pre-curing Time on the Compressive Strength of Mortar/Concrete," International Journal of Engineering and Technology vol. 10, no. 2, pp. 1044-U0012, 2018.
