This paper investigates the effect of nano-papyrus cane ash as an additive on concretes’ mechanical and physical properties. Three types of concrete mixtures, 1:2:4, 1:1.5:3, and 1:1:2 were prepared for each mixture, nano-papyrus ash was added in five different dosages of 0.75, 1.5, 3, 4.5, and 6% by weight of cement; therefore, eighteen mixes would be studied in this work. Physical properties represented by dry density and slump were also measured for each mix. Moreover, to evaluate the mechanical properties development split tensile strength and compressive strength were obtained at age (7 and 28). Results manifested that the adding of nano ash developed the compressive strength and split tensile strength of concrete and the maximum enhancement recognized in the mixes with a content of 4.5% nano-papyrus in each studied mixture in this work. The slump test results indicated that the workability of concrete increased with adding nano-papyrus ash gradually with increasing nanoparticles' content. As well as, dry density was significant increased with nano-papyrus ratio; greater values were recorded in mixtures with 1.5-4.5% content of nano-papyrus. When comparing the concrete mixes used, it was found that the best results were obtained with 1:1:2 mixtures. This remarkable improvement in concrete properties considers the nano-papyrus is considered a cement economical and useful replacement for traditional construction material. Doi: 10.28991/cej-2021-03091649 Full Text: PDF
Autoclaved aerated concrete (Called Thermostone in Iraq) is one of the popular building materials that are used in various purposes in construction industries. It is factory-made material that can be moulded into blocks which can be used in framework buildings. However, these buildings are under the risk of fire since it has different cusses such as arson and electrical short circuit. It is important to find ways to improve counter such phenomenon. Therefore the objective of this paper is investigating the fire resistance performance of Thermostone with and without plastering. Five different samples were used for the test, four of them were covered with different types of plastering. Three tests were employed for this study: Compressive, absorption, and density test. For all tests, the samples were exposed to elevated temperatures from 250 °C to 900 °C. It was shown that plastered samples have demonstrated a higher fire resistance and lower absorption rate than non-plastered ones.
In this study, CaO powder was added in proportions (1, 1.5, 2, and 2.5) % by weight of cement to concrete mixtures with mixing ratios (1: 2: 4 and 1: 1.5: 3). The ratio of water to cement used in mixing was 0.48 and 0.25 with 2% of superplasticizer (KUT PLAST Sp 400). The results showed that when adding CaO to the mixture (1: 2: 4) the highest compressive strength was for samples containing 2% CaO. Where the percentage of increase was 69.23% at 28 days age compared to the reference specimen of mixture (1: 2:4). The lowest percentage of shrinkage for specimens containing 1.5% CaO in the laboratory atmosphere at 25° C and humidity was 65%, while the specimens that were in the outside atmosphere at 40° C and humidity 20 % were lower percentages (0.673 and 0.405) %, respectively, compared with reference specimen of the same mixture. The results also showed that when the mixing ratio (1:1.5:3), the highest compressive strength was for specimens containing 2.5% CaO, and the lowest shrinkage was for samples containing 1.5% CaO. As the percentage of increase in compressive strength reached (73.58) % at the age of 28 days compared to the reference specimen of mixture (1:1.5: 3) and the percentage of decrease in shrinkage for specimens that were in the laboratory and outside atmosphere (7.44 and 7.77) %, respectively, compared to the reference specimens.
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