Abstract
This paper introduces the experimental results of long-term carbonization of concrete with machine-made sand (MSC), which is part of the studies on durability of this new concrete. Three strength grades of concrete C30, C40 and C50, and the contents of stone powder in machine-made sand of 5%, 9% and 13% in mass were considered in the mix proportion of concrete with machine-made sand. The ordinary concrete with natural river sand in the same strength grade was tested at the same time for comparison. The test was conducted for 360 days, and the results showed that the carbonization of MSC was similar with that of ordinary concrete, the carbonized depth increased with the increasing carbonization time. The carbonization was rapid at initial before 28 days, and became slowly with the time going by. The content of stone powder in machine-made sand affected the carbonization of MSC in some extent, which should be limited in a reasonable range. Based on the test data, the formulas for forecasting the carbonized depth of MSC are suggested.
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