Experimental Research on Dry Shrinkage Property of High Performance Concrete

In order to reveal the durability of high-performance concrete in underground engineering, 10 different mix ratios of dry shrinkage tests were conducted on high-performance concrete used in an underground civil air defense project. After three days’ age, we dismantle the mold and measure the base length. And then, make test-pieces stay in water at 20 ± 3 ℃ to test the first, seventh and fourteenth day’s length. After that, we move the test-pieces in the drying chamber to measure the twenty-eighth and ninetieth day’s length. We reach the impact of every aggregate dosage on concrete’s expansion and shrinkage rate. And we analysis high performance concrete’s crack resistance. At last, we reach the best mix proportion in the construction and dry shrinkage property, and summarize some necessary measures to prevent or reduce concrete shrinkage cracks.