T/JSJTQX 27-2022 Active

Scope: This document specifies the technical preparations, resource preparations, production preparations, temperature measurement, concrete construction, formwork removal, and concrete curing for the winter construction of highway bridge concrete components. This document applies to the winter construction of highway bridge concrete components. Other-grade highway and waterway projects may refer to it for implementation. Main technical content: The technical content of the *Technical Guidelines for Winter Construction of Highway Bridge Concrete Components* introduces that winter construction is one of the key aspects of quality control activities for highways in Jiangsu Province. Jiangsu Province is located in a transitional climate zone from temperate to subtropical, with an average January temperature ranging from -1°C to 3.3°C. The extreme temperature in northern Jiangsu exceeds -10°C in January. With the development of high-quality transportation projects, there are an increasing number of innovative materials, new equipment, new technologies, new processes, and new management concepts emerging in winter construction. However, the relevant provisions in the *Technical Specifications for Highway and Bridge Construction* alone cannot meet the actual construction needs. At the same time, technical issues in winter construction management have become prominent. The preparation of this document aims to address the standardization and normalization issues in winter construction of highway bridges in Jiangsu Province under the new technical conditions and quality engineering requirements. Through research and investigation, this document provides experience and practices, advanced concepts, and new technologies in winter construction, such as the new technologies of using electric heating tapes to heat formwork and conduct curing, methods for judging whether concrete in winter construction is frozen, and methods for estimating the strength of concrete in winter