Influence of Rice Husk Ash Density on the Workability and Strength of Structural Concrete (original) (raw)
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Architecture, Civil Engineering, Environment
Rice husk disposal has become a great challenge for Pakistan being one of the largest rice producer across the globe. Rice Husk Ash (RHA) contains sufficient pozzolanic properties which opens up opportunities for its usage as cementitious material as partial replacement of Ordinary Portland Cement (OPC). In this research RHA was added as cement replacement in different percentages by weight of cement i.e. 0%, 6%, 12%, 18% and 24% at constant mix ratio of 1:2:4 and water-cement ratio of 0.6 that is M15 grade concrete with a target strength of 15-20 MPa. The properties of concrete like workability, compressive strength, tensile strength, flexure strength, and water permeability were investigated by casting standard concrete samples in the form of cubes, cylinders and beams in addition to cost comparison study The outcomes show that workability of fresh concrete increases with an increase in RHA content and almost all concrete properties studied in this research gave more favorable res...
Strength Performance of Concrete Produced with Rice Husk Ash as Partial Replacement of Cement
African Journal of Environmental Sciences & Renewable Energy, 2022
Concrete is the most common construction material with its major constituent being cement. The production of this Cement results in a lot of environmental issues which include the constant emission of CO2 gas. Reduction of this gas, preservation of natural resources needed in the production of the constituent of cement and subsequent sustainability of concrete structures have fueled the search for alternative cementing material to produce environment-friendly construction materials. Recently, supplementary cementitious materials like the agricultural by-products are used to replace a portion of the cement in concrete mixtures. The use of such CSM in concrete not only prevents these products from being land-filled which causes pollution but also enhances the properties of concrete in the fresh and hardened states. These supplementary cementitious materials with pozzolanic action react with hydration products in cement to form calcium silicate hydrate (CSH) thus enhancing and improving concrete quality and consequently reducing the cost of concrete production. One of such material is Rice Husk Ash (RHA). The study investigated the chemical composition of RHA as well as the specific gravity, workability, compressive strength, split tensile strength and flexural strength properties, with varying percentage of blended cement concrete and 100% cement concrete of mix ratio 1:2:4 and water-cement ratio of 0.5 were examined and compared. Slump test and compacting factor test was carried out to check the effect of RHA on the workability of fresh concrete. RHA partially replace cement in the order of 0%, 5%, 10%, 15%, 20%, 25% and 30% were cast. The concrete specimens were tested at the ages of 7, 14, 21 and 28 days. The optimal cement replacement was found to be at 10% RHA. This combination gave a compressive strength of 26.8 N/mm2. This is close to the control concrete with compressive strength of 26.9 N/mm2 at 28days hydration period. Therefore, rice husk ash can be used as a replacement for cement in concrete.
IJERT-Effect of Rice Husk Ash (RHA) as Partial Replacement of Cement on Concrete Properties
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/effect-of-rice-husk-ash-rha-as-partial-replacement-of-cement-on-concrete-properties https://www.ijert.org/research/effect-of-rice-husk-ash-rha-as-partial-replacement-of-cement-on-concrete-properties-IJERTV1IS6098.pdf Cement is widely noted to be most expensive constituents of concrete. The entire construction industry is in search of a suitable and effective the waste product that would considerably minimize the use of cements and ultimately reduces the construction cost. Rice husk ash (RHA) which has the pozzolanic properties is a way forward. The possibility of using RHA as a construction material need to be investigates. Three grades of ordinary Portland cement (OPC) namely; 33, 43 and 53 as classified by Bureau of Indian Standard (BIS) are commonly used in construction industry. A comparative study on effects of concrete properties when OPC of varying grades was partially replaced by RHA is discussed in this paper. Percentage replacement of OPC with RHA was 0, 10, 20, 30 and 40% respectively. The compressive strength, water absorption, shrinkage and durability of concrete were mainly studied. The study suggests that up to 20% replacement of OPC with RHA has the potential to be used as partial cement replacement, having good compressive strength performance and durability.
Influence of Rice Husk Ash (RHA) on the Workability of Concrete
IOP Conference Series: Earth and Environmental Science, 2021
Rice husk ash (RHA) is the promising pozzolanic material which can be used with Portland cement in a specific proportion to produce durable concrete and with reduced impact of cement industry on environment. Effect of RHA on the fresh properties (i.e., Workability) of concrete has been studied. Workability means the ease with which the concrete can be placed and compacted without segregation. Thus, to produce a high-quality concrete, its workability is very important factor. To measure the workability of concrete slump test is the most common test that is performed. This test gives the general idea that the mix prepared is harsh, or flowable. In this study, RHA was added to concrete in different proportion as a binder. Results reveals that RHA can be used as a binder in sustainable construction.
Effect of Rice Husk Ash (RHA) on Physical Property and Mechanical Strength of Concrete
Advanced Materials Research, 2015
Fast depleting natural resources, huge consumption of energy, and environmental hazards involved in the production of cement has inspired researchers to find partial replacement of cement using other or similar materials. Rice husk ash (RHA), an agricultural waste, is classified as “a highly active pozzolan” because it contains a very high amount of amorphous silica and a large surface area. Rice husk is natural fiber that has the advantages of low density, low cost and biodegradable. In Malaysia paddy is grown locally especially in northern states of Peninsular Malaysia. Rice husk is a by-product of paddy being process into rice. These make it a natural candidate for cement replacement agent especially in Paddy producing countries. In this paper, RHA was introduced as the micro filler in concrete mixtures. The replacement of RHA which is lighter as compared to the Ordinary Portland Cement results in decreasing density of cement fiber composite and less permeable concrete.
Effectiveness of Use of Rice Husk Ash as Partial Replacement of Cement in Concrete
India is a major rice producing country, and the husk generated during milling is mostly used as a fuel in the boilers for processing paddy and producing energy through direct combustion. About 21 million tones of Rice Husk Ash (RHA) is produced annually. This RHA is regarded as a waste and has disposal problem because of the fact that it consumes a vast area for dumping. Lots of ways are being thought of for disposing them by making commercial use of this RHA. RHA can be used as a replacement for concrete (5 to 15%).This paper evaluates how different contents of Rice Husk Ash added to concrete may influence its properties. In this study, cement was replaced by waste RHA as 5%,10% and 15% by weight for M-25 mix. The concrete specimens were tested for compressive strength, durability (water absorption) and density at 28 days of age and the results obtained were compared with those of normal concrete. The results concluded the permissibility of using waste RHA as partial replacement of cement up to 10% by weight of cement
JOURNAL OF APPLIED ENGINEERING SCIENCES, 2022
To reduce the consumption of cement in construction industry has been a hot area of consideration now days due to high evolution of CO2 gases during its production. Since decades efforts are made to replace cement with cementitious materials; minerals, agricultural, industrial by products etc. A few are fly ash, ground granulated blast furnace slag, silica fume, rice husk ash etc. These cementitious materials are often adopted as partial replacement of cement. However, their effectiveness and suitability as cementitious material depends upon their properties and the source of the production. Pakistan is an agricultural country and one of the major crops is Rice crop. It produces a substantial amount of rice husk during the processing g of the rice. A substantial amount of Rice Husk Ash (RHA) is produced on the burning of rice husk used as fuel in the rice mills while generating steam for parboiling process of rice grains. This ash causes the environmental problems also if not dumped properly. RHA is believed to have siliceous properties which may be used as supplementary cementitious material in concrete. As the suitability of supplementary cementitious materials is dependent upon the source of rice husk, temperature of burning of husk, its fineness and other properties. This study is focused on to determine the effect of rice husk ash produced by burning of the rice husk obtained from the local rice mills. Experimental investigation carried includes the determination of workability and compressive strength of concrete with different dosage of RHA from 5% to 30% with an increment of 5% tested at 1day, 3days, 7days and 28 days of the age of concrete. The results are compared with corresponding concrete without RHA and tested at the same ages. The results show the reduction in both the parameter; workability and compressive strength due to RHA particularly at its higher dosage beyond 10% by weight of cement.
Effect of Rice Husk Ash and Water-Cement Ratio on Strength of Concrete
In present status quo, number of researcher are working on waste materials as potential supplement for any of the constituent of concrete to cope with sustainable development. As, the ingredients which constitute the body and give strength to concrete are natural available limited material and has to deplete one day. Thus, there is desperately need of alternate that may replace the limited natural resources. In this regard, this study focuses the rice husk ash (waste stuff) as partial replacement of cement and its possible impact on strength of concrete. In addition, this research work also this research work is conducted to investigate the effect of water-cement ratio on the strength of concrete at 10% partially replacement of Rice husk ash (RHA) by the weight of cement. RHA is a mineral admixture obtained by burning husk at certain temperature. Since as per pervious researches, the physical and chemical properties of RHA are very reactive Pozzolans and possess binding properties so can be used as cement supplement. Therefore, for laboratory experimental work, total 144 cubical and 72 cylindrical. In this research, number of concrete specimens were cast and tested at 1:2:4 mix ratio with various w/c ratios i.e. 0.45, 0.50 and 0.60. Further, at each specified water-cement ratio, two mechanical properties (compressive and splitting tensile strength) were determined in Universal Testing Machine (UTM). These physical properties of concrete were investigated at 7, 14, 28 and 56 days curing period. The experimental results show that the compressive strength gets increased up to 14.51% and tensile splitting test strength increased up to 10.71% at the w/c ratio of 0.45. The workability of plain fresh concrete at all w/c ratios is slightly greater than the workability of concrete blended with 10% RHA. Thus, RHA improves the properties of concrete when used in specific amount. As a result, it can reduce the overall cost of construction and it will reduce the adverse environmental effect.
Materials
The incorporation of waste materials generated in many industries has been actively advocated for in the construction industry, since they have the capacity to lessen the pollution on dumpsites, mitigate environmental resource consumption, and establish a sustainable environment. This research has been conducted to determine the influence of different rice husk ash (RHA) concentrations on the fresh and mechanical properties of high-strength concrete. RHA was employed to partially replace the cement at 5%, 10%, 15%, and 20% by weight. Fresh properties, such as slump, compacting factor, density, and surface absorption, were determined. In contrast, its mechanical properties, such as compressive strength, splitting tensile strength and flexural strength, were assessed after 7, 28, and 60 days. In addition, the microstructural evaluation, initial surface absorption test, = environmental impact, and cost–benefit analysis were evaluated. The results show that the incorporation of RHA redu...
This research work was experimentally carried out to investigate the effects of partially replacing Ordinary Portland cement (OPC) with our local additive Rice Husk Ash (RHA) which is known to be super pozzolanic in concrete at optimum replacement percentage which will help to reduce the cost of housing. With this research work, the problem of waste management of this agro-waste will be solved. The specific gravity of RHA was found to be 1.55, the density of RHA concrete was found to be 2.043, 1.912 and 1.932kg/m 3 at 10%, 20% and 25% replacement percentages respectively. RHA concrete was found to be very workable with a slump value of over 100mm. The incorporation of RHA in concrete resulted in increase water demand and enhanced strength. The compressive strength values at 28days were found to be 38.4, 36.5 and 33N/mm 2 at the same replacement percentages above. These compressive strength values compared favourably with the controlled concrete strength of 37N/mm 2 at a mix ratio of 1:1.5:3.