No abstract

Ceramic waste is one of the most active research areas that encompass a number of disciplines including civil engineering and construction materials. Ceramic waste powder is settled by sedimentation and then dumped away which leads to environmental pollution, in addition to forming dust in summer and threatening both agriculture and public health. Therefore, utilization of the ceramic waste powder in various industrial sectors especially the construction, agriculture, glass and paper industries would help to protect the environment. It is most essential to develop eco-friendly concrete from ceramic waste. In this research replacing the (OPC) cement by ceramic waste powder has been studied accordingly in the range of (0, 10, 15, and 20) % by weight of M-30 grade concrete. Concrete mixtures were produced, tested and compared in terms of compressive and tensile strength to the conventional mixture. These tests were carried out to evaluate the mechanical properties for 7 and 28 days. As a result, the CWP cement concretes decreased the workability retention. The values of average hardened concrete density for concrete mixes with CWP cement are higher than the reference mix in 7 days, but lower than the reference mix in 28 days. The maximum value of compressive strengths at 7 and 28 days and tensile strength was achieved at about 5% CWP concrete mix. CWP slowed the compressive strength development especially at early ages. All mixtures with CWP showed good strength development at 28 days. It was observed that all CWP replacement ratios achieved higher compressive strength than characteristic compressive strength which is equal to 30 N/mm2 in 28 days, except the 20% ratio gives 29.72 N/mm2. Test results showed that CWP has potential to be used as an ingredient in concrete mixtures to partially replacing cement. The study showed that concrete mixtures with ceramic waste powder (CWP) had variable performance of the measured properties depending on the replacement level used.

This paper has presented details of a research project to investigate the structural behaviour of Concrete-Filled Steel Tubular (CFST) stub columns through axial load strength. Three series can be distinguished were chosen depending of the steel X-sectional area of the tubes for each series of different shape has been compared: circular, rectangular and square steel sections considering the parameters of the different types of concrete infill, i.e. normal strength concrete (NSC) or high strength concrete (HSC). It is found from these comparisons that all the codes (Eurocode part 4 (EC4), AISC-360-10 and BS5400-5) predicted conservative column strengths compared to the test results and published   theoretical method with an average ratio (0.75for EC4,0.656 for AISC-360-10 and 0.6 for BS5400-5). the main advantages of the ABAQUS software program are it gave closer predictions to the published experimental study results with an average ratio 0.96, simplicity and the savings in test time. circular CFST stub columns strength was higher than square CFST stub columns when compare rectangular and square in same series the column have higher area of concrete have higher strength.

This paper represents experimental study to examine the influence of several coatings to decrease the rebar corrosion. The experiments were carried out for three types of coatings. Those have been painted on the steel and select the best type of coatings in decreasing the steel corrosion rate. Testing program included experiments to select the best one within three types of coatings (Isonem MS Polymers, Sika Zink Rich-1, Isonem PU Floor) are used and available in market. The result of corrosion rate for rebar in uncoated samples in level five (after 70-days) was loss of more than 50% from its weight. While, the result of corrosion rate for rebar in samples with coating type (C) "Isonem PU Floor" was loss of less than 2 % from its weight which is the most effective type and the best coating.

This paper has presented details of a research project to investigate the structural behaviour of Concrete-Filled Steel Tubular (CFST) stub columns through axial load strength. Three series can be distinguished were chosen depending of the steel X-sectional area of the tubes for each series of different shape has been compared: circular, rectangular and square steel sections considering the parameters of the different types of concrete infill, i.e. normal strength concrete (NSC) or high strength concrete (HSC). It is found from these comparisons that all the codes (Eurocode part 4 (EC4), AISC-360-10 and BS5400-5) predicted conservative column strengths compared to the test results and published   theoretical method with an average ratio (0.75for EC4,0.656 for AISC-360-10 and 0.6 for BS5400-5). the main advantages of the ABAQUS software program are it gave closer predictions to the published experimental study results with an average ratio 0.96, simplicity and the savings in test time. circular CFST stub columns strength was higher than square CFST stub columns when compare rectangular and square in same series the column have higher area of concrete have higher strength.