Study of the Compressive Strength and Thermal Behaviour of Lightweight Concrete in Cameroon (Published)
This thesis contributes to sustainable innovation in construction materials. The primary objective is to evaluate the balance between mechanical strength, thermal behavior, and structural lightness, with the goal of identifying formulations best suited to energy-efficient and environmentally friendly building applications. To this end, several lightweight concrete mixtures were developed by partially replacing conventional aggregates with natural lightweight ones pozzolan and PKS used independently. The Dreux-Gorise method guided the mix design, and a cement fixed dosage of CPJ 42.5 is adopted. cylindrical specimens are cast and subjected to standardized tests to assess fresh and dry density, compressive strength, porosity, and thermal behavior. The experimental results show a clear relationship between the type of lightweight aggregate and the overall concrete with 34% PKS achieved a dry density of 1850 kg/m3 and a compressive strength of 19.3 MPa at 28 days, while the formulation with 23% demonstrated a superior compressive strength of 24 MPa at 28 days with a density of 2100 kg/m3. In addition to experimental testing, a digital validation of the compressive strength was conducted exclusively through numerical simulations performed in ANSYS, using literature-based values of thermal conductivity, specific heat capacity, and density consistent with the concrete formulations developed in this study. The simulation aimed to analyzed transient heat transfer and to highlight the thermal insulation potential of lightweight concrete. This research provides a comparative insight into two rarely juxtaposed natural aggregates and reinforces the role of digital methods in evaluating thermal performance of materials
Keywords: Compressive Strength, digital simulation, lightweight concrete, palm kernel shell, thermal performance
The Effect of Anadara Granosa Shell Waste as a Filler and a Coarse Aggregate Subtitution on the Mechanical Properties of Normal Concrete (Published)
The amount of stone mining as a natural resource is decrease, innovation for concrete needed to making a concrete. Anadara granosa shell waste can be used as an alternative material that can be optimally utilized to make concrete. Anadara granosa shell waste itself contains calcium which can be used as a concrete mixture. It is possible that the waste shells can be used as a substitute for gravel in concrete and as a cement filler. To analyze the effect of Anadara granosa shell waste in concrete, a cylindrical specimen was made with a diameter of 15 cm and a height of 30 cm. Mechanical tests on normal concrete include compressive strength, modulus of elasticity and split tensile strength. The percentage of gravel substitute is 0%, 1.5%, 2%, 3%, 3.5% of the weight of the gravel and the percentage of cement filler is 0%, 1%, 3%, 6%, 9% of the weight of cement. The compressive strength of the concrete plan is 30 MPa. The result of this research is that when the Anadara granosa shell waste is used at the ideal percentage, the concrete will experience an increase in the concrete’s mechanical properties. The percentage of gravel substitute is 1.5% by weight of gravel and cement filler is 1% of cement weight, resulting in compressive strength of 37.37 MPa, modulus of elasticity of 28720.44 and split tensile strength of 2.95 MPa where these results exceed compressive strength. Normal concrete and the compressive strength of a predetermined plan. If the percentage of shellfish waste is greater, the mechanical properties of the resulting concrete will decrease. The results show that the mechanical properties of concrete are interrelated where the higher the compressive strength, the higher the modulus of elasticity and tensile strength.
Keywords: Compressive Strength, Concrete, Filler, Mechanical Properties, shell waste
Coconut Fiber Usage for the Compressive Strength Brick Materials (Published)
This study was conducted to calculate the strength of brick materials that already mixed with fibers of coconut. Using coconut fiber mixture was aimed at producing a better composition of concrete. An experimental design was applied to the composition of cement, sand, water and coconut fiber with a ratio of 1 PC cement. It made the ratio was 4.5 PS sand. The strength testing or compressive strength after the materials have been dried as long as 28 days. The averaged at variation I (0%) of 1 kN / cm2, variation II (1.5%) of 0.498 kN / cm2, variation III (1.8%) of 0.441 kN / cm2 and variation IV (2.1%) of 0.379 kN / cm2 were done. It concluded the addition of coconut fiber with brick materials produced has a decreasing compressive strength value.
Keywords: Compressive Strength, Test, coconut fiber, materials of brick
Effect of Various Types of Fillers on Mechanical Properties of Concrete (Published)
An experimental study on the effect of inclusion of three different types of fillers on mechanical properties of concrete is carried out. This paper presents the results of laboratory tests of 72 concrete cylindrical specimens of 10 cm diameter and 20 cm length with inclusion of Vf=10% of steel fillers, cast iron fillers and stone powder fillers in the concrete mix. Permeability, Compressive strength and splitting tensile strength are investigated by comparing the density of different types of concrete. Test results demonstrated that the stone powder fillers significantly improve mechanical properties of concrete while the cast iron fillers decline.
Keywords: Compressive Strength, Filler, Modulus of Elasticity, Splitting Tensile Strength, density