No abstract

An experimental study was carried out to investigate the strength properties of concrete produced with waste marble dust (WMD) as partial replacement for cement. Concrete specimens (cubes, cylinders and prisms) were cast and tested for compressive, split-tensile and flexural strengths at 0% (control mix), 10%, 20% and 30% replacement of cement by weight with WMD after curing in water for 28 days. The results obtained reveal that the replacement of cement with WMD had appreciable impact on the compressive, split-tensile and flexural strength of concrete. An optimum of 20% replacement of cement with WMD is therefore recommended for concrete production.

Flooding is a disaster which may occur naturally or as an effect of human activities. Flooding which is a global hazard has resulted in devastating effects on humans and the environment. Thousands of lives are lost and properties worth several millions of dollars are destroyed annually due to flooding in Nigeria. Various Flood Risk Management (FRM) approaches have been employed to manage this menace in Nigeria resulting in little success. This paper highlights the types, causes and impact of flooding in Nigeria as well as evaluate the efforts at local and national levels in FRM. After due considerations of performance and lapses of past efforts, the article advances the resilient infrastructure approach as a formidable and sustainable FRM option for Nigeria.