Theoretical and measurement error analysis of porosity and drainage coefficient of permeable water-stable gravel
The porosity and drainage coefficient of permeable water-stable gravel were calculated theoretically and compared with the measured values.The effects of different gradations and different cement dosages on the permeability of permeable water-stable gravel were studied.The results show that there is a large error between the theoretical and measured values of porosity and drainage coefficient of permeable cement-stabilized aggregates when the designed porosity is less than 15％,and the calculated porosity and drainage coefficient of permeable cement-stabilized aggregates when the porosity is more than 18％are in line with the measured values.When the cement dosage is 5％～7％,the Elsayed empirical formula can better predict the drainage coefficient and porosity of permeable cement stabilized crushed stone.When the ash dosage is greater than 7％,it affects the connected pores of the water stabilized crushed stone and has a great influence on its drainage capacity.
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