Abstract
This paper presents the effects of variability in the chemical and elemental composition of Rice Husk Ash (RHA) sourced from four (4) different locations on Tensile Properties of Concrete. RHA is an agricultural waste gotten from rice mills after removal of rice paddy for food and burnt in open air or under controlled processes. RHA is found to be pozzolanic and can be used to partially replace cement to enhance the strength and quality of concrete. The different sources where RHA was gotten are; Ogoja, Abakaliki, Adani and Adikpo in Nigeria. It is discovered that the pozolanic properties of RHA varies based on their source location. Samples from Ogoja where found to have the highest pozzolanic properties followed by Abakaliki, Adani, and Adikpo, their silica content was found to be 84.55, 76.3, 70.12, 70.11, respectively. RHA was used to replace cement in concrete at 5, 10,15,20,25 and 30%. The compressive strength was determined and the values are as follows; And the compressive strength values at 28 days was found to be in the range of 37-42N/mm2 at 5%RHA, 35-39.5N/mm2 at 10%RHA, 30-34.5N/mm2 at 15%RHA, 27-29N/mm2 at 20%RHA, 22-25.6N/mm2 at 25% RHA and 21-24N/mm2 at 30% RHA compared to the controlled sample with a strength value of 42.64N/mm2. Cylindrical columns concrete of size 100mm diameter by 200mm long were moulded and stored in water for 28 days before testing for tensile splitting strength. The values determined from the split tensile test are as follows; 2.1-3.1N/mm2 at 5%RHA, 2.1-2.5N/mm2 at 10% RHA, 1.8-2.10 N/mm2 at 15% RHA, 1.2-1.7 N/mm2 at 20%RHA, 1.1-1.3 N/mm2 at 25% RHA and 0.62-0.9 N/mm2 at 30% RHA while the results of the controlled sample is 3.1 N/mm2.From the results above it can be deduced that source location influences the chemical properties of RHA strength characteristics of the Concrete with RHA as partial replacement.
Highlights
Tensile strength is the physical property of different building materials and how they can withstand tension or how a material resists being elongated of stretched by forces such as wind and gravity
From the results and values obtained, the Flexural strength properties were found to compare favourably with those obtained for the controlled concrete
It can be deduced that concrete with Rice Husk Ash (RHA) as an admixture can be used for structural purposes provided the proportion or percentage replacement is followed as confirmed from the Laboratory work
Summary
Tensile strength is the physical property of different building materials and how they can withstand tension or how a material resists being elongated of stretched by forces such as wind and gravity. Tensile strength is important because it guides professionals to build high rise buildings which subjected to more extreme weather conditions due to their heights in a safe and efficient manner. This happens because the higher the building, the more it interrupts wind currents that are not noticeable from the ground and in higher altitudes as well, the air current is much stronger and unimpeded, leading to harder and faster winds. The need to study and investigate tensile strength of concrete
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