Mechanical Behaviour of Mortar Made with Washed Bottom Ash as Sand Replacement

The availability of concrete manufacturing materials is the greatest crisis faced by the construction industry these days. The future generations will face terrific problems by digging up and blasting the limited natural resources. So, there is an importance for using the recycled demolition waste and fly ash which are considered as waste materials till years. To decrease the disposal of these materials, reduce the cost and for protection of environment these materials are highly useful. This is an experimental study to inspect the strength of the demolished aggregate and fly ash concrete. The idea is to trim down the amount of demolished concrete waste materials and fly ash going into landfill and discarding pits. Three combinations of M25 grade concrete by replacing demolished aggregate concrete and fly ash in various percentages (0%, 5%, 10%, 15%, and 20%) at 0.48 water/cement ratios were performed. From the experimental study it was proved that the limited applications of demolished recycled coarse aggregate and fly ash is recommended in structural concrete.

Section: Resultsmentioning

confidence: 99%

Influence of fly ash on the properties of recycled coarse aggregate concrete

Ramakrishna¹

2020

“…S 2 concrete specimen can be classified as medium workability. From the results,[17] greater replacement in percentage of QD & SD decreases concrete's workability as shown in Figure7of slump values with varying % of concrete.…”

mentioning

confidence: 78%

An Experimental Study on Effect of Replacing Natural Sand by Quarry Dust and Saw Dust on Properties of Concrete

K¹

2020

Construction industry is one of the contributing fator to the environmental crisis; the use of waste materials or industrial by-products from different industries as an alternative to conventional concrete materials would reduce this issue. The use of this material will contribute to sustainability in the building industry and protect natural resources. It can replace traditional concrete materials and use it. This study aims primarily to examine sand replacement to optimize the benefit of industrial by-products and other waste materials. Day by day, demand for sand is growing. Sand mining increases gradually as needed, with the impact from the mining of the river, water quality, and ecological effect generally affected. Therefore, it is very important to consider Sand Alternative in view of the need for sand in the future. Lack of sand affects construction work directly. The alternate material such as quarry dust and saw dust may be used in concrete to meet the need of fine aggregates. Quarry dust comes from the crushing of rocks, while sawdust refers to the fine size, powdery waste formed by sawing of wood. In this study, traditional mix 1:2.32:2.82 (M25) with water to binder ratio is maintained as 0.49 was used in this present study.Here the natural sand is replaced partly here by quarry dust (QD) and sawdust (SD) with different percentages i.e. is 50% of natural sand as constant and remaining 50% as the different proportions of Quarry dust and Saw dust. respectively by weight and effects of replacement on concrete is observed. The concrete was cast and their compressive, tensile strength and durability measured at 7, 14 and 28 days, respectively; the cubes of 150 x 150 x 150 mm, and the cylinders of 15 cm of diameter and of 30 cm of height were cast. The incorporation of 0.5 percent glass fibers into concrete as a mixture will increase the compressive and the tensile strength of the concrete dramatically.

“…However, acetic acid (CH 3 COOH) was added to improve the moisten behavior to get better particles, due to diminished surface tension of solution [10]. Some research [22], [23] related to current work, can be further explored for future research. This research was aimed to determine the optimum ratio of Mg to SiO 2 through silicon conversion of geothermal silica by magnesiothermic reduction, to observe the optimum of acetic acid concentration in the second leaching of the silicon.…”

Section: Introductionmentioning

confidence: 99%

Silicon preparation derived from geothermal silica by reduction using magnesium

Silviana¹

2020

Geothermal silica denotes as a potential source of silica due to high content of silica. Silica can be converted to be silicon through magnesiothermal reduction. The objectives of paper are to obtain the optimum ratio of Mg to SiO 2 , and to obtain acetic acid concentration in the second leaching of the silicon. At beginning, purification of geothermal silica was carried out through acid leaching by 20% of hydrosulfuric acid (H 2 SO 4 ) with silica content of 96.3 wt%. Silicon conversion had been performed used magnesiothermic reduction at 650 oC for 7 hours. The mole ratio of Mg to SiO 2 used 1.6:1, 2:1, and 2.5:1. The acid leaching process used HCl (3 N) at 60 o C for 1 hour and utilized HFof (5 N) with varied acetic acid concentration for 1 hour at 70 o C (25, 35, 45, 50, and 60 % ww). Afterward, the results were confirmed by characterization of the silicon with XRF analsys. Silicon yield was achieved at 77.1 wt% with 91.4 wt% of purity at first acid leaching. This results have been generated by use of Mg to SiO 2 ratio at 2:1 and leached out by HCl 3 N. However, at second acid leaching with HF-acetic acid mixture released the purity of silicon at 93.9 wt%. Silicon from geothermal silica can replace the use of graphite as anodes of lithium ion batteries.