Investigation on properties of Pervious Concrete incorporating Lime Calcined Clay Cement (LC3)

By the end of 2050, annual cement production will probably exceed 5 million metric tonnes due to an increase in output every year. Ordinary Portland Cement is produced at a rate of about 3.6 billion metric tonnes annually [1]. A tonne of carbon is emitted into the environment for every metric tonne of cement produced, leading to environmental degradation. Another issue faced from the perspective of sustainability is urban flooding which prevents the recharge of groundwater. Also, the cost of mitigating the flooding problem through adequate drainage system is too expensive. This study aims to add significant addressal to both the above two problems by analysing the behaviour of pervious concrete prepared by using Lime Calcined Clay Cement (LC3). LC3 compositions with 30%,40% and 50% replacement of Ordinary Portland Cement with Lime Calcined Clay (LC2) were taken into study. Determination of most optimum LC3 mix was done and the mix design for pervious concrete was carried out. Pervious concrete was tested for its mechanical and hydraulic/durability properties. The results showed that LC3-30 yielded the highest compressive strength, lowest setting time and lowest water content requirement for standard consistency. The pervious concrete prepared with LC3-30 also gave comparable strength results when compared with OPC pervious concrete. However, no significant difference was found in hydraulic properties of the two concretes. LC3 shows a great potential in wide range applications of pervious works such as Pervious Concrete Pavements (PCP) and roofing. The study concludes that use of Lime Calcined Clay Cement can very well be incorporated to create economic, lightweight and sustainable structures.