The National Building and Road Research Institute (NBRRI) introduced an innovation and new technology in building infrastructure called Pozzolana in order to decrease the occurrence of building collapse in Nigera. The new product, Pozzolana are materials with the property of cement that provides 40% cement replacement in building construction. Pozzolans are a broad class of siliceous or siliceous and aluminous materials which, in themselves, possess little or no cementitious value but which will, in finely divided form and in the presence of water, react chemically with calcium hydroxide at ordinary temperature to form compounds possessing cementitious properties.
Pozzolana is a combination of calcium hydroxide to give you gel that hardens with time ; that’s why the strength of cement keeps increasing to almost 2 to 2 years and the rate of decrease increases drastically after 28 days from day zero when it is liquid to day 7 to day 14, to day 21, to day 28. These Pozzolana materials behave just like cement in the presence of cement. Pozzolana is either a naturally existing material or artificial material, particularly agro waste like rice, which has ash, groundnut which has ash, back ash which comes from sugarcane stem and quite a number of them which when you introduce into cement and behaves like cement, becomes a cementation ability. The essence of the presence of cement in a certain percentage is to introduce the basic components required for the reaction to start. Once it starts, it continues to react because cement is a binder when you mix it fresh it’s in liquid state but it goes through a process called hydration.
Pozzolana is introduced in Nigeria and attempted to replace cement 100 percent instead of having partial replacement. A small handbook which will be printed in due course for application will be developed to showcase the introduction.
“About cost, it can replace cement sometimes as much as 40 to 50 percent and because it’s a waste product, it reflects approximately the cost effectiveness. You can have cost effectiveness as much as 30 percent less if you use Pozzolana and if the replacement goes higher.”
“The commissioning of the Bokkos plant is one of the firsts steps taken by the institute to promote the utilization of artificial Pozzolana in the country” he stated.
He said the project is an important one for the institute with one of the plant already completed and being used as a laboratory facility which a means for more of job creation. “The next phase after the building would be to install machines in building trades and carpentry, in welding, in cosmetology i.e. weaving of hair, things that have to do with clothing and generally women friendly. Apart from providing a Centre for community meetings, some of them are ready for the next stage. The ones that are primarily for NBRRI, the institute will do all within its powers to equip them for the skills that are intended for, while the ones that are meant for legislators will be initiated by them,” he added.