Experimental Analysis of Blended Pavement Quality Concrete on Cold joints of Rigid Pavement

Abstract

One-time construction of entire reinforced concrete pavement is not possible as there is a delay in the concreting process or some site limitations. Due to delays in a sequence of the fresh and old concrete cold joints are formed in pavement panels, the Cold joint creates unfavourable conditions on reinforced concrete pavements and produces an adverse effect on the compressive strength of concrete and bond strength of concrete between joints. To control the formation of cold joints selfing and crossing theory is implemented to improve the pavement quality concrete (PQC). To check the effect of the cold joint on concrete, cube, cylinder, and beams are cast for various time lags keeping blend ratio is one as constant. The specimens are tested for Compressive strength, Split Tensile strength, and Flexural strength of the concrete. Results obtained from selfing and crossing are compared with conventional methods of concrete. In a conventional method, the strength of concrete starts decreasing when time lag starts increasing from 0 minutes. In the selfing and crossing method, the strength of concrete increases as time lag increases from 0 to 90 minutes but after that, strength starts decreasing. It has been observed that the strength of concrete joints prepares by the conventional method is less compared to the same concrete joints prepared at different time lags using the selfing and crossing technique. It can be concluded that strength at joint increases using the selfing and crossing technique as compared to the conventional technique.