In recent years, polymethyl methacrylate polymer concrete (PMMA-PC) has been used extensively in the field of construction works. It is needed because it will harden within 1 hr at low temperatures. A basic investigation of the low-temperature curing characteristics of workable PMMA-PC is the focus of this paper. PMMA-PC and its binder are prepared with various binder formulat ions, and the working life of the binder and the peak exotherm time and compressive strength of PMMA-PC are examined under various low-temperature conditi ons. The working life of the binder and the peak exotherm time of PMMA-PC decrease with an increase in promoter and cross-linking agent contents and a rise in test temperature. The contents of the binder with the desired working life at low temperatures less than 0 C can be estimated by using a nomograph prepared in this investigation. The peak exotherm time of PMMA-PC can be predicted from the working life of the binder. In conclusion, the optimum binder formulations are recommended for the low-temperature applications of PMMA-PC, which hardens and develops a high compressive strength of about 500 kg/cm2 in the range of o• c to-20 C within approximately 1 hr.

Recently, polymethyl methacrylate polymer concrete (PMMA-PC) has been widely used for various construction works, such as the repair and restoration of concrete structures, because of its good workability and high early strength development. For its applications during winter, in cold districts, in the repair of cold stores, and so forth,· the development of the high early strength is required at low temperatures, and, in many oases, the construction time is quite limited (1)• This investigation was conducted to make clear the low-temperature curing characteristics of PMMA-PC.