As cement consumption is growing dramatically, we need low carbon solution, LC3 is a breakthrough technology to reduce CO2 emissions from Cementitious materials, it reduces the clinker amount by about 50%, better chloride resistance and better durability performance is reported in most researches. As we know The reactivity of the calcined clay is overwhelmingly dependent on the kaolinite content of the clay but what if there is not a high kaolinite level clay deposit available or it is not economical to use?! This paper describes the potential of 29% kaolinite Level Clay in LC3 for using in structural concrete in comparison with Ordinary Portland Cement (OPC) and pozzolanic Portland cement (PPC-15%). in order to find the best mechanical and durability performance of LC3 concrete, clay was calcined in 4 different temperature 650, 750, 850 and 950c. the compressive strength and surface resistivity (SR) of all concretes after 7, 28 and 90 days of curing was measured. Concrete made with (LC3-50) showed approximately the same compressive strength in comparison with (PPC-15%) even with 50% reduction in clinker factor. surface resistivity of LC3 concrete is far better than concrete made with (OPC) and (PPC), even in cases where the compressive strength of LC3 concrete was lower than the control sample. Therefore, it is better to consider the properties of concrete durability along with the mortar and concrete compressive strength results, concrete with higher compressive strength and concrete made with higher cement clinker factor is not necessarily more durable.