Blinding layer - Thin layer of concrete normally put on the ground in preparation for foundation building.

CEM I 42.5 N and CEM I 42.5 R - Technical notation for Portland cement. Letter N and R refers to the early day strengths of cement. N refers to cement with normal early day strengths while R refers to rapid hardening cements i.e. cements with high early day strengths. Notation is as per the new Kenyan Standard adopted from the EN Standards.

Cement Standards - Documents that guide the manufacture of cement, testing as well as determine the properties and constituents of the product

Class - Refers to the strength of concrete after 28 days e.g. class 40 describes concrete with strength of 40 Kn/mm2 (Kilonewtons per square meter) at 28 days.

Clinker - Compound produced after cooling raw meal previously burnt to partial melting point at 14500C

EN Standards (European Norm - Standards that originated from the European Countries

KS - Kenya standards

KS 02- 1262: 1993 - Previous Kenyan standard for manufacture of Ordinary Portland Cement before adoption of EN standards

KS 02-1263: 1993 - Previous Kenyan standard for manufacture of Portland Pozzolana Cement before adoption of EN standards

KS 1725 Part 1: 2001 CEM II/B-L 32.5R - Technical notation for Portland Limestone cement. L refers to the Limestone additive in cement. Notation is as per the new Kenyan Standard adopted from the EN Standards.

KS 1725 Part 1: CEM II/B-P 32.5 - Technical notation for Portland Pozzolana cement. P refers to the pozzolana additive in cement. Notation is as per the new Kenyan Standard adopted from the EN Standards.

Portland Cement - Name originated from the resemblance of the color and quality of the hardened cement to Portland stone, limestone quarried in Dorset (In England). The term is now a generic name for cement worldwide and describes cement made from mixing calcareous or argillaceous, or other materials with silica, alumina, and iron oxide, burning them at a melting temperature of 14500C to produce clinker

Pozzolana and Limestone - Additives used in the making of cement

Raw meal - is a finely ground mixture of coral stone, bauxite, iron ore and shale before burning to make clinker