Abstract
The cement-fly ash stabilized crushed-stones are prepared with different cements, which SO3 contents are 1.8%,2.6%,3.4%,4.2%,5.0%,5.8% and 8.8%，and their 28d splitting strengths, 28d resilient modulus’s, expansion -shrinkage and dry shrink anti cracking coefficients are studied. On these bases, the influence of SO3 content of cement on shrinkage cracking resistance is analyzed. The mechanism of compensating shrinkage by micro expansion in pavement base and the function of SO3 on cement-fly ash binder are also explored in paper. It is proved that the increase of SO3 content in a suitable scope (1.8%-5.8%) can improve the drying shrinkage cracking resistance of cement-fly ash stabilized crushed-stones when the content of fly ash is 10%。But the structure and the performance of materials will be destroyed if the SO3 content of cement increases excessively (>8.8%).
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