These Cement additives are now recognized and accepted as desirable, even essential constituents of concrete for technical, economic ecological reasons. During cement production, a significant amount CO2 is released into the atmosphere. Global clinker production responsible approximately 7% total emissions.The use such slag, fly ash, natural pozzolan constituent can cause reduction in quantity ...

Soft soil was one of the most widely encountered problems in construction, especially for archipelago countries which its area lowland with a high deposit soft soil. To overcome this problem, stabilization used as solution. Soil general uses chemical substances that are classified pozzolan material. Pozzolan material capability to strengthen cohesion grains. Mostly, consists silica. Overboulder...

rice husk ash (rha) is natural pozzolan containing reactive silica and/or aluminum. when the material is mixed with lime in powdered form and in the presence of water, it will set and harden like cement. this work uses osadebe’s optimization model to optimize the shear modulus of concrete made from rha. the strengths predicted by the model are in good agreement with their corresponding experime...

Shrinkage behavior of a geopolymer cement paste prepared from pumice-type natural pozzolan was studiedby changing parameters of chemical composition including SiO2/Na2O molar ratio of activator and total molar ratiosof Na2O/Al2O3, and H2O/Al2O3. For investigating the effect of curing conditions on shrinkage, hydrothermal curingwas also applied. The obtained results clearly revealed the governin...

Rice Husk Ash (RHA) is natural Pozzolan containing reactive silica and/or aluminum. When the material is mixed with lime in powdered form and in the presence of water, it will set and harden like cement. This work uses Osadebe’s optimization model to optimize the shear modulus of concrete made from RHA. The strengths predicted by the model are in good agreement with their corresponding experime...