Application of Microsurfacing for the Reduction of Microcracking of Cement-Stabilized Pavement Layers

Shrinkage cracking occurs in cement-treated bases due to desiccation and cement hydration. Eventually these cracks propagate through the pavement surface. These cracks render the pavement susceptible to water infiltration and increase the likelihood of accelerated pavement distress. Numerous options exist for minimizing the incidence of these reflective cracks. This paper focuses on the effects of microcracking on the performance and behavior characteristics of cement-stabilized bases. The microcracking concept can be defined as the application of several vibratory roller passes to the cement-treated base during a short curing stage typically after one to three days, in order to create a fine network of cracks. Based on the investigations carried out immediately after the microcracking, the stiffness and compressive strength of the stabilized layer will be diminished. Furthermore, as this is performed only a few days after placement, in the long term the microcracking will not impact the pavement’s overall structural capacity. Additionally, the research study has shown that microcracking is quite effective at reducing shrinkage cracking problems in the stabilized base. Thus microcracking should be considered as a viable and inexpensive option to incorporate shrinkage crack control into the construction of cement-stabilized bases.