—NATM (New Austrian Tunneling Method) is the typical construction method for the tunnel. Generally, inside of the tunnel shall be covered by lining concrete. The form work of the concrete will be removed when the concrete achieve enough strength. In other words, next step of construction cannot be conducted during this concrete curing period. Hence acceleration of curing of the concrete makes reduction of construction period possible. On the other hand, various special admixtures of which gives an effect of acceleration of cement hydration, were released to construction market, so far. In this study, influence of dosing various admixtures into the concrete on an improvement of concrete properties was focused on to accelerate tunnel construction work. As a result, from the viewpoint of productivity improvement of the concrete construction, it was confirmed that the use of appropriate accelerator allowed both reduction of construction period and quality improvement.
—NATM, admixture, hydration, concrete lining, accelerator.
S. Sasaki and S. Date are with Course of Civil Engineering, School of Engineering, Tokai University, Japan (e-mail: email@example.com). Y. Uno is with Dept. of Civil Engineering, Technical Research Institute, Sato Kogyo Co., Ltd., Japan.
S. Hashimoto is with Dept. of Civil Engineering, Faculty of Engineering, Fukuoka University, Japan.
Cite: S. Sasaki, Y. Uno, S. Hashimoto, and S. Date, "Productivity Improvement of the Concrete Construction Work," International Journal of Engineering and Technology vol. 8, no. 4, pp. 254-259, 2016.