S.A. ADEGBEMILEKE

This study investigates the properties of limestone calcined clay cement (LC3) with a water/cement ratio of 0.5 and cement/sand ratio of 1:2.75 produced using clay sourced from Uzebba, Nigeria. The kaolinitic Uzebba clay was calcined at 600°C, 700°C and 800°C to activate it's pozzolanic properties. Mortar cubes were cast and cured in lime water and by air. A total of 120 mortar cubes were prepared for compressive strength testing and water absorption test. For compressive test, 9 cubes were mixed and cured in lime water and air serving as the control, 27 cubes were mixed for LC 3 calcined at 600°C, 700°C and 800°C for 30% and 40% replacement and cured in lime water and by air. Additionally, this study utilized other tests like sieve analysis of fine aggregate, standard consistency test, setting time of cement and bleeding tests. The average compressive strength for 30% and 40% mortar cubes cured in lime water ranged from 9.44N/mm2 - 17.12N/mm2 and 7.47N/mm2 - 12.16N/mm2 respectively, while for 30% cured in air ranged from 5.70N/mm2 - 15.91N/mm2 For water absorption test, 12 cubes were mixed and cured in lime water to determine the amount of water absorbed by the cubes for the control and replacement.

This paper aims at assessing the return on investment and carbon mitigation potentials of five investment alternatives for the limestone calcined clay cement in a long-term horizon appraisal (15 years). Anticipated growing demand for cement. This research has explored the ,beneficial contribution of a new available technology, LC³ cement, resulting from the combination of clinker, calcined clay and limestone, with a capacity of replacing up to 30% or 40% of clinker in cement. Increasing the production of conventional blended cements instead brings only marginal economic benefits without supporting the needed increase in production capacity. The conducted study also shows that, in spite of the extra capital cost required for the calcination of kaolinite clay, LC³ drops production costs in the range of 15–25% compared to conventional solutions. A coarse sharp sand from sea was gotten with gypsum, calcined clay, limestone, granite and opc was taken to the laboratory for proper research in which 40% and 30% of calcined clay
was being use for the research with gypsum, coarse aggregate, limestone, fine aggregate and
opc using it likewise with coarse aggregate and fine aggregate as control. In this research we are able to obtain the comprehensive strength for 3days,7days, 14days and
28 days. The sieve analysis was gotten, bleeding, workability, setting time, porosity, segregation and water absorption