Abstract
Lightweight Cellular Concrete (LCC) is gaining popularity for its use in various construction projects. The feasibility of incorporating LCC into pavement construction has recently been investigated. This study analysed construction activities' effects on three LCC densities and granular A material to examine further the viability of employing LCC as a subbase alternative to unbound aggregate. This included designing, instrumentation, and building a four-section 200-meter field segment. A control section employed granular A as a subbase layer, while LCC400, LCC475, and LCC600 sections applied 400 kg/m³, 475 kg/m³, and 600 kg/m³ LCC as subbase, respectively. The density of LCC were chosen based on past industry experience for pavement construction. Materials applied in the other layers were the same in all four sections. Subsurface instrumentation was installed to monitor the pavement pressure, strain, moisture, and temperature response. The predicted ultimate strengths for 400, 475 and 600 kg/m³ were found to be 0.93 MPa, 1.93 MPa, and 2.08 MPa. Results also indicated that the control section experienced 78% more peak pressure than the LCC475 and LCC600 sections and 61% more pressure than the LCC400 section during construction. It was determined that a long-time frame between LCC pour and asphalt paving operation coupled with excessive truck traffic before asphalt paving could be detrimental to the performance of LCC pavements. This is due to high strain responses and damage to the LCC homogenous air bubble structure.
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