A Study on Use of Rice Husk Ash in Concrete

Abstract

The rice husk is an agricultural waste which is obtained from milling process of paddy and approximately 22% of the weight of paddy is rice husk. The waste is used as fuel in producing stream in parboiling process. The 25 % the weight of husk is converted into ash which is known as rice husk ash (RHA) and is again a waste which is disposed. This ash consists of amorphous silica which can be used as pozzolana in making concrete and cement instead of disposing it without compromising on the properties of cement or concrete if replaced in specific proportion with other constituents of cement or concrete. In this study the ordinary Portland cement is replaced in different proportion with RHA to obtain concrete with comparable and satisfactory strength and properties to that of normal concrete. The proportions of replacement chosen are at 2.5% interval starting from 5 % to 15 % and the casted concrete were tested under compression at different ages and results obtained are compared with normal concrete of same grade and it is concluded that the results are comparable.

Effects of Elevated Atmospheric Co2, O3 and Soil Phenanthrene on Soil Enzyme Activities and Microbial Biomass

“…The results of this study showed that consistent with the soil with adding phenanthrene. The direct effects of CO2 and O3 on the leaf tissue of vegetables might promote or interfere with the secretion of root substances through affecting the photosynthesis of leaves, thus causing the change of coil microecological environment (Wang et al, 2014;Cheng et al, 2011;Gautam et al, 2019). Soil phenanthrene affect directly on the root system of vegetables, and its target organs are different from CO2 and O3.…”

Silanization of SiO2 Decorated Carbon Nanosheets from Rice Husk Ash and Its Effect on Workability and Hydration of Cement Grouts

“…In another work, Franceschini et al prepared covalently bonded polymer C–S–H composite with the formation of covalent linkages between polymer and C–S–H phases by grafting trialkoxysilane (T-silane) and methyldialkoxysilane (D-silane) to the polymer chains [ 19 ]. To sum up, there are some attempts for the development of cement mixes by using rice husk ash as an alternative additive and direct or partial replacing with silica [ 20 , 21 , 22 , 23 ] and also most of the published works are mostly focused on the enhancement of strength properties of cementitious composites [ 24 , 25 ]. Besides, the effect of functionalized RHA by silane coupling agents on thermal and mechanical properties of thermoplastic composites was investigated to improve interfacial interactions in the composite structure [ 26 ].…”

Rethinking the Collaboration of Civil Engineering and Human Geography

“…Therefore, collaboration in the field of civil engineering with the field of social science, such as human geography, is one of the alternatives to face challenges in the future. The type of building material has accommodated the importance of environmental sustainability; for example, many types of research have begun to consider renewable raw materials such as bamboo and husk ash as a mixture of concrete [1][2][3][4][5]. How about human society changes and culture?…”