摘要
中国大坝混凝土工程中,从上世纪50年代初开始,对骨料的碱活性和碱骨料反应就较为重视,从地质勘探规程到水工混凝土试验方法中,均列入了有关碱骨料及碱骨料反应试验方法的规定。中国已建的混凝土大坝中,有些也含有一定量的碱活性骨料,但由于采用了低标号水泥和大量的活性混合材,因此至今未发生碱骨料破坏反应;但也有个别工程,虽经碱骨料反应的检测,并采用了一定的抑制措施,但运行20年后,在大坝溢流面混凝土中出现了碱骨料反应的微观和宏观裂缝破坏。这就从一个侧面反映了碱骨料反应的试验方法、判断标准、抑制措施等尚需进一步完善。
Since the early 50's of the past century, the alkali of aggregate and alkali-aggregate reaction absorbed notices of many experts in the dam concrete engineering of China. Some prescribes about the test method of alkali aggregate and alkali-aggregate reaction have been shown in the regulations of geologic reconnoitering and the test method of the hydraulic concrete. Some concrete dams having been built in China adopt the alkali aggregate, due to adopt the low grade cement and lots of active mixing, the alkali-aggregate reaction has still not been found in those dams up to now. But face concrete of spillway dam of some engineering, which past the safety line of the test of alkali-aggregate reaction and adopted some measures of the alkali aggregate reaction restrained, appear the micro and macro wreck cracks of the alkali-aggregate reaction after 20 years. It is laterally indicated that the test methods, the standards of differentiating and measures of restraining need be improved step by step.
出处
《水力发电》
北大核心
2005年第1期34-37,共4页
Water Power
关键词
老坝
混凝土
碱骨料反应
中国
old dam
concrete
alkali-aggragate reaction
China
