Abstract
The influence of Nigerian Portland-Limestone cement grades on the strength of concrete was investigated in this study. Three cement grades of 32.5R, 42.5R and 42.5N were adopted. A constant mix design ratio of 1:2:4 with a varying water-cement ratio of 0.4, 0.5, and 0.6 was used. All of the constituents of concrete were calculated using the mass of a concrete cube specimen of 150mm x 150mm x 150mm. A total of 135 cube specimens were cast and cured for 3, 7, 14, 21 and 28 days accordingly in order to determine the compressive strength of the concrete. The results obtained show that concrete cube specimens produced with Portland-Limestone cement grade 42.5N had the optimum compressive strength on the 28th day of curing in each water-cement ratio. However, the optimum compressive strength on the 7th day of curing in each water-cement ratio was obtained in the concrete cube specimens produced with Portland-Limestone cement grade 42.5R. The results also show that concrete produced from cement grade 32.5 will generally produce more workable but weaker concrete than concrete produced from cement grade 42.5, irrespective of the water-cement ratio. Finally, it was concluded that the compressive strength of concrete is inversely proportional to all the water-cement ratios used in this study, irrespective of the grade of cement.
Highlights
INTRODUCTION1Concrete is the most commonly used material in the construction industry since it is utilized to construct the majority of infrastructure designs such as bridges, buildings, drainages, roads, seaports, harbours, runways, etc. [1]
The influence of Nigerian Portland-Limestone cement grades on the strength of concrete was investigated in this study
It can be observed that the optimum compressive strength on the 28th day of curing in each water-cement ratio was obtained in the concrete cube specimens produced with
Summary
Concrete is the most commonly used material in the construction industry since it is utilized to construct the majority of infrastructure designs such as bridges, buildings, drainages, roads, seaports, harbours, runways, etc. [1]. It is utilized in precast and pre-stressed concrete, as well as in the construction and finishing of various kinds of structures such as water-retaining structures, bridges, highways, and buildings. 53-Grade Cement is known for its high quality and durability It is commonly utilized in projects requiring more strength, such as concrete bridges, industrial buildings, runways, highways, pre-stressed girders, etc. Cement grades 33 and 43 are accessible for construction in the Nigerian open market, which engineers use to get an acceptable concrete mix design for individual works. Due to the substitution of Portland-Limestone Cement for Ordinary Portland Cement in the Nigerian open market, Kazeem, Festus and Hamzat [21] studied PLC grades of 32.5N and 42.5 N commonly used for concrete production in Nigeria. The present study aims at evaluating the effects of cement grades on the compressive strength characteristics of structural concrete made from Nigerian Portland-Limestone cement grades of 32.5R, 42.5R and 42.5N
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