Analysis of the Strength and Modulus of Cement Stabilized Crushed Stone for Highway Pavement Base
In order to reduce the damage of highway pavement and improve the safety of pavement during operation,it is necessary to choose the strength and modulus of cement stabilized crushed stone reasonably.Taking the semi-rigid base pavement of G312 National Highway project as the research object,the strength and modulus variation mechanism of cement stabilized crushed stone were ana-lyzed.Based on indoor experiments,the strength and modulus variation laws of cement stabilized crushed stone were analyzed at cement content of 3.0%,4.0%,5.0%,6.0%,and curing age of 7、14、28、56、90 d.A calculation model was established using pavement cal-culate software to calculate the tensile stress at the bottom of the pavement structure under standard axle load and overload.The re-search results show that the higher the cement content and the longer the curing age,the greater the strength and modulus of cement stabilized crushed stone,and the strength changes linearly,while the modulus changes rapidly at first and then slowly.When the cement content is≥4.0%and the curing age is≥7 d,the strength and modulus of the cement stabilized crushed stone base meet the specifi-cation requirements.At the same time,the maximum tensile stress at the bottom of the cement stabilized crushed stone base is less than 1.1 MPa,indicating that the strength and modulus values are reasonable.
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