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一、前言大坝水泥研究始于1930年,在美国水泥化学家鲍格的领导下,研制出有Ⅱ型波特兰中热水泥和Ⅳ型波特兰低热水泥。其7、28天水化热,前者为70、80卡/克;后者为60、70卡/克。自1940年美国建海华西坝后,“由于早期强度低,在大型重力坝建设中采用低热波特兰水泥(即Ⅳ型水泥)几乎完全停止了,……[13]。我国及欧、美、日各国均以中热水泥筑坝,形成自三十年代以来延续至今的分缝分块严格温控防裂的施工工艺体系。这已成为快速建坝
I. INTRODUCTION The dam cement research began in 1930. Under the leadership of the US cement chemist Borg, it has developed type II Portland medium heat cement and type IV Portland low-temperature cement. Its 7,28 days of hydration heat, the former is 70, 80 cards / gram; the latter is 60, 70 cards / gram. Since the construction of the West China Sea Dam in the United States in 1940, “low-heat Portland cement (ie, type IV cement) was almost completely stopped due to its low early strength.”[13]. China, Europe and the United States In Japan and Japan, dams were built with medium-heat cement, forming a strict temperature-control and crack-proof construction technology system for the joints and blocks since the 1930s. This has become a rapid construction of dams.