In this research, the long-term potential cracking of normal concrete internally cured with clay brick waste as a sustainable approach was investigated. 10% and 15% volume of sand was substituted with corresponding quantity of pre-saturated clay brick waste to enhance the hydration of cement and improve properties of concrete. Four beams internally cured were compared with two control beams. The use of clay brick waste can improve the compressive and splitting tensile strength and also a significant reduction in cracks were observed. Depending on the recorded results, it is demonstrated that the exemplary percentages of clay brick waste to natural fine aggregate was found to be 15%, which developed greatest compressive and splitting tensile strength, and reduce the crack by means of flexural test.
This Investigation aims to study the effect of adding Steel fibers with different volume fractions Vf (o.5, 0.75, and 1% by volume of concrete) with aspect ratio 100 on mechanical properties of concrete, and alsofinding the influence of petroleum products (Kerosene and Diesel) on mechanical properties of Steel Fiber Reinforced Concrete (SFRC).The experimental work consists of two groups: group one consists of specimens (cubes and prisms) plain and concrete reinforced with steel fiber exposed to continuous curing with water. Group two consists ofspecimens (cubes and prisms) plain and concrete reinforced with steel fiber exposed to kerosene and diesel after curing them in water for 28 days before exposure. The results of all tests refer that the specimens (plain and reinforced concrete with steel fiber with different volume fraction) exposed to kerosene were better than the specimens (plain and reinforced concrete with steel fiber with different volume fraction) exposed to diesel.
Ultrasonic pulse velocity test is one of the most important non-destructive tests for exploring the essential properties of concrete such as compressive strength. Many previous researchers have examined relationship between ultrasonic pulse velocity and the compressive strength of concrete, developing equations to link these factors; however, comparing the calculated compressive strengths created by applying different equations to the same ultrasonic pulse velocity value, the results are rarely even close. This research aimed to develop new model based on seven such previous equations using a statistical program (Minitab) to calculate the compressive strength of concrete more accurately. The compressive strength thus obtained was equal or very close to the average results obtained from all seven equations, and the results were verified against a dataset of 100 results from ultrasonic pulse velocity test for multi-story concrete building. The obtained results were also compared with the average results from the seven equations used within the experimental program. The comparisons confirmed that, the new model can be used as an alternative approach to calculating compressive strength instead of using all seven equations.
In recent times, there has been increased interest in using various types of fibres in the cement-based materials industry. This work thus aims to investigate the possibility of improving the mechanical properties of mortar samples by using available and cheap polypropylene fibre with the aid of a microwave curing technique. For this purpose, 5×5×5 cm cubes of mortar containing different percentages and lengths of polypropylene fibres were cast and then subjected to various ranges of curing time under microwaves. Compressive strength, direct tensile strength, and density tests were conducted on reference mortar (specimens without fibres) and mortar reinforced with polypropylene fibre specimens at various ages (3, 7, and 28 days) of curing. The results showed a marginal decrease in the compressive strength against an increase in the direct tensile strength as fibre content increased. All mixes showed acceptable values for density against the reference mixes.
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