The enormous quantities of ceramic waste lead us to its use in the construction field to solve both an environmental and an economic problem. The present study aims to recycle ceramic waste powders (CWP) to produce mortars. To this end, five crushed sand (CS) based mortar mixes with prismatic dimensions of 4x4x16 cm³ were prepared by partially replacing 0, 5, 10, 15, and 20% white cement with CWP. Tests were carried out to assess bulk density, compressive strength, and ultrasonic pulse velocity (UPV). The results obtained showed that increasing the proportion of ceramic waste powder (CWP) in mortar mixes led to a decrease in bulk density, compressive strength, and UPV in the different mortars. In addition, linear correlations were observed between the different variables studied.
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Core sampling is the most accurate method of evaluating the compressive strength of concrete structures. However, it is preferable to take only small cores to avoid damaging the structures. It turns out that various elements influence the strength of compressed cores. This study examines the influence of specimen size, aggregate size, concrete class, and curing method on compressive strength. Three aggregates measuring 3/8, 8/15, and 15/25 mm are used to make six sets of concrete compositions with strengths of 25 MPa and 30 MPa. Nine specimens are made, one for each variety of aggregate and concrete. Cores of 100 mm, 75 mm, and 50 mm sizes are made. These cores are extracted from concrete blocks curing in the outside air to simulate the real concrete curing environment. Cast specimens cured in water and air with diameters of 50 mm, 100 mm, and 150 mm are also made. The objective is to compare the average compressive strength of all cast or extracted specimens with that of cylindrical standard specimens of diameter 150/300 mm and the cores and cast specimens. The obtained findings showed that the compressive strength is overestimated when we compare fp100 cores and standard air-cured specimens (fc), with a conversion factor varying from 0.69 to 0.96. However, a decrease is observed in comparison with water-cured specimens. The use of fp75 cores reduced the conversion factors, which are between 0.83 and 0.87 for B25 concrete. The highest fp/fc ratios are obtained for fc50 cores, which can reach 1.24. It turns out that the size of the core and the class of concrete have a much greater influence on the fp/fc ratios.
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