Frequent building collapses in Nigeria have caused serious casualties and property losses. Some enterprises believe that 32.5 strength cement is the main cause of building collapse, and even suggest that the Nigerian government cancel 32.5 strength cement; On the other hand, some cement enterprises oppose the cancellation of 32.5 cement and propose to produce 32.5 cement and 42.5 cement at the same time. They say that the cancellation of 32.5 cement will cause job losses in the cement industry and is not conducive to the choice of consumers.
To this end, the Nigerian Standards Organization has set up a technical committee to review Nigerian cement standards. After a review, the committee said: "After detailed investigation, the cement itself is not to blame for the collapse of buildings in Nigeria, and it may be that the experts or consultants responsible for the construction work did not follow the construction specifications."
Based on this, Olusegun Aganga of the Federal Ministry of Industry, Trade and Investment of Nigeria recently announced that the new national cement standard has been formulated. After a grace period, both domestic and imported cement must comply with the standard and will be labeled "NlS 444-1". The new cement standards were implemented after a heated debate among stakeholders in the cement industry over whether low-quality cement was causing building collapses.
The highest strength cement, CEM I 52.5R, 52.5 N, or 52.5, will be used for bridge construction; the second highest strength cement, CEM II 42.5 R, 42.5 N, or 42.5, will be used for column, beam, slab, and block casting; and the lowest strength cement, CEM I & & II 32.5 R, 32.5 N or 32.5 will be used only for the painting of the building.
It is reported that Dangote Cement Company is the only enterprise producing 52.5 strength cement in Nigeria.
According to the Federal Ministry of Industry, Trade and Investment, the new cement standards will "help end-users make the right choice; avoid the unethical use of different types of cement; help correctly identify different types of cement, improve the traceability of cement and guide users correctly". The Federal Ministry of Industry, Trade and Investment also said that the standard had been reviewed because of the five-year mandatory review period of the new standard. In addition, the quality of cement in the Nigerian market is also worrying.
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