scholarly journals UTILIZATION OF RICE HUSK ASH ON PERVIOUS CONCRETE AS A PARTIAL REPLACEMENT OF CEMENT

2020 ◽  
Vol 9 (10) ◽  
pp. 41-48
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Agricultural Waste ◽  
Waste Product ◽  
Rice Paddy ◽  
Pervious Concrete ◽  
Partial Replacement ◽  
Test Results ◽  
Compressive Strength Test ◽  
Water Absorption Test

Rice Husk Ash (RHA) is an agricultural waste product which is produced in large quantities globally every year and difficulty involved in its disposal, RHA becoming an environmental hazard in rice producing countries. India alone produces around 120 million tons of rice paddy per year, giving around 6 million tons of rice husk ash per year. RHA can be used in concrete to improve its strength and other durability factors. So we can use RHA as a partial replacement of cement in pervious concrete. In this research (OPC) cement has been replaced by RHA accordingly in the range of 10%,20%and30%byweightofcementforconstant 0.40 water cement ratio. The compressive strength test and water absorption test was carried out for 7, 28 days. So the main aim of the investigation to study the behaviour of PERVIOUS CONCRETE while replaces the RHA with different proportions in concrete. The test results were obtained from the research which are compared with the control mix (CM).

scholarly journals Effects of source location on the pozolannic properties of Rice Husk Ash (Rha) and strength properties of concrete

2021 ◽  
Vol 2 (1) ◽  
pp. 011-020
Author(s):  
Godwin Adie Akeke
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Agricultural Waste ◽  
Chemical Properties ◽  
Rice Paddy ◽  
Strength Properties ◽  
Source Location ◽  
Silica Content ◽  
Partial Replacement

This paper presents the effects of variability in the chemical and elemental composition of Rice Husk Ash (RHA) sourced from four (4) different locations on Tensile Properties of Concrete. RHA is an agricultural waste gotten from rice mills after removal of rice paddy for food and burnt in open air or under controlled processes. RHA is found to be pozzolanic and can be used to partially replace cement to enhance the strength and quality of concrete. The different sources where RHA was gotten are; Ogoja, Abakaliki, Adani and Adikpo in Nigeria. It is discovered that the pozolanic properties of RHA varies based on their source location. Samples from Ogoja where found to have the highest pozzolanic properties followed by Abakaliki, Adani, and Adikpo, their silica content was found to be 84.55, 76.3, 70.12, 70.11, respectively. RHA was used to replace cement in concrete at 5, 10,15,20,25 and 30%. The compressive strength was determined and the values are as follows; And the compressive strength values at 28 days was found to be in the range of 37-42N/mm2 at 5%RHA, 35-39.5N/mm2 at 10%RHA, 30-34.5N/mm2 at 15%RHA, 27-29N/mm2 at 20%RHA, 22-25.6N/mm2 at 25% RHA and 21-24N/mm2 at 30% RHA compared to the controlled sample with a strength value of 42.64N/mm2. Cylindrical columns concrete of size 100mm diameter by 200mm long were moulded and stored in water for 28 days before testing for tensile splitting strength. The values determined from the split tensile test are as follows; 2.1-3.1N/mm2 at 5%RHA, 2.1-2.5N/mm2 at 10% RHA, 1.8-2.10 N/mm2 at 15% RHA, 1.2-1.7 N/mm2 at 20%RHA, 1.1-1.3 N/mm2 at 25% RHA and 0.62-0.9 N/mm2 at 30% RHA while the results of the controlled sample is 3.1 N/mm2.From the results above it can be deduced that source location influences the chemical properties of RHA strength characteristics of the Concrete with RHA as partial replacement.

scholarly journals Performance of Compressed Stabilised Earth Blocks with Rice Husk Ash

2020 ◽  
pp. 143-153
Author(s):  
P. Asha ◽  
K. Johnson ◽  
C. M. Sachin ◽  
V. Vetrivel ◽  
E. Prasanna
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Clay Soil ◽  
Strength Test ◽  
Unit Weight ◽  
Partial Replacement ◽  
Test Results ◽  
Compressive Strength Test ◽  
Compressed Earth Blocks ◽  
Earth Blocks

This study investigated the feasibility of using Rice Husk Ash (RHA) as a partial replacement of cement in the stabilization of clay soil for the production of compressed earth blocks. Varying levels of percentage replacement of cement with rice husk ash in range of 0%, 2.5%, 5%, 7.5%, 10% and 12.5% was used. From the compressive strength test results, compressive strengths of 2.07 MPa, 1.64 MPa, 1.74 MPa, 1.90 MPa and 1.50 MPa were obtained for blocks admixed with 2.5%, 5%, 7.5%, 10% and 12.5% respectively. Water absorption was found to increase steadily with increase in percent of rice husk ash and value is 8.55% for the block with 12.5% RHA.  Unit weight of blocks decreased with increase in percent of rice husk ash.

Effect of Rice Husk Ash (RHA) on Physical Property and Mechanical Strength of Concrete

2015 ◽  
Vol 1115 ◽  
pp. 150-155
Author(s):  
Maisarah Ali ◽  
Mohd Syafiq Fadzil ◽  
Siti Asmahani Saad
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Low Cost ◽  
Agricultural Waste ◽  
Physical Property ◽  
Peninsular Malaysia ◽  
Partial Replacement ◽  
Highly Active

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.

Assessment of Rice Husk Ash (RHA) and Calcium Chloride (CaCl2) on Compressive Strength of Concrete Grade 20

2018 ◽  
Vol 40 ◽  
pp. 22-29
Author(s):  
Joseph A. Ige ◽  
Mukaila A. Anifowose ◽  
Samson O. Odeyemi ◽  
Suleiman A. Adebara ◽  
Mufutau O. Oyeleke
Keyword(s):  
Compressive Strength ◽  
Calcium Chloride ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Conventional Concrete ◽  
Compressive Strength Test ◽  
Compressive Strength Of Concrete ◽  
Strength Result

This research assessed the effect of Nigerian rice husk ash (RHA) and calcium chloride (CaCl2) as partial replacement of cement in concrete grade 20. Rice husk ash (RHA) is obtained by combustion of rice husk in a controlled temperature. The replacement of OPC with rice husk ash (RHA) were 0%, 5%, 10%, 15% and 20%. 1% of Calcium Chloride was blended with OPC/RHA in all the test specimens except from control mix. Concrete cubes of sizes 150mm x 150mm x 150mm were cast and cured in water for 7, 14 and 28 days respectively. Slump test was conducted on fresh concrete while density test and compressive strength test were conducted on hardened concrete. The slump results revealed that the concrete becomes less workable (stiff) as percentage increases. The compressive strength result at 28 days revealed that 5%RHA/1%CaCl2 have the highest strength of 26.82N/mm2 while 20%RHA/1%CaCl2 have the lowest strength (21.48N/mm2). Integration of 5%RHA/1%CaCl2 and 10%RHA/1%CaCl2 as cement replacement will produce a concrete of higher compressive strength compared to conventional concrete in grade 20 concrete.

scholarly journals Mechanical and Durability Properties of Aerated Concrete Incorporating Rice Husk Ash (RHA) as Partial Replacement of Cement

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 604
Author(s):  
Tariq Ali ◽  
Abdullah Saand ◽  
Daddan Khan Bangwar ◽  
Abdul Salam Buller ◽  
Zaheer Ahmed
Keyword(s):  
Aluminum Powder ◽  
Rice Husk ◽  
Industrial Ecology ◽  
Rice Husk Ash ◽  
Partial Replacement ◽  
Type I ◽  
Fine Aggregate ◽  
Test Results ◽  
Durability Properties ◽  
Aerated Concrete

In today’s world, the implementation of industrial ecology for sustainable industrial development is a common practice in the field of engineering. This practice promotes the recycling of by-product wastes. One of those by-product wastes is rice husk ash. This paper describes an investigation into the effect of rice husk ash (RHA) as a partial replacement for cement, to produce lightweight, aerated concrete. Type I Portland cement, fine aggregate, and aluminum powder as an aerating agent were used in this study. The RHA was used in different replacement levels, i.e., RHA was used to replace cement at 0%, 2.5%, 5%, 7.5%, 10%, 12.5% and 15% by weight. Aluminum powder was added during mixing at 0.5% by weight of binder to obtain lightweight, aerated concrete. Test results are presented in terms of physical, mechanical, and durability aspects that include density, compressive strength, split tensile strength, and flexural strength of concrete cured at different curing regimes, i.e., 3, 7, 28, and 90 days along with corrosion analysis, and sulphate attack at 28 days of curing. The test results show that using 10% RHA as a partial replacement of cement in aerated concrete is beneficial in triggering the strength and durability properties of concrete.

scholarly journals Mechanical Properties of Rice Husk Ash as a Mineral Addition in Concrete

2008 ◽  
Vol 5 (2) ◽  
pp. 21
Author(s):  
Kartini Kamaruddin ◽  
Hamidah Mohd Saman
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Agricultural Waste ◽  
Partial Replacement ◽  
Replacement Level ◽  
Splitting Strength ◽  
Normal Strength ◽  
Tensile Splitting Strength

It is shown that some of the wastes have properties that would improve the quality of concrete produced. One such waste is agricultural waste rice husk, which constitutes about one-fifth of 600 million tones of rice produced annually in the world. The performance of RHA concrete was found to be varied among those of researchers and most of the studies encompassed for the utilisation of high grade concrete. This paper reported the investigation carried out on the mechanical properties of normal strength concrete of grade 30 N/mm2 with various partial replacement level of ordinary Portland cement (OPC) with Rice Husk Ash (RHA). Two(2) batches of same grade of concrete with and without use of superplasticiser (Sp) were adopted. The mechanical properties evaluated are in terms of compressive strength, flexural strength and tensile splitting strength of RHA concrete with and without superplasticiser (Sp). The results show that the optimum replacement level of RHA was 20 % and with the addition of Sp the replacement of RHA was taken as 40 %. However, the results of the study show that the performance in term of flexural strength and tensile splitting strength does not significantly improved with the replacement of cement with RHA.

scholarly journals EXPERIMENTAL INVESTIGATION OF THE POZZOLANIC POTENTIALS OF MILLET AND RICE HUSK ASH AS MINERAL ADDITIVE IN SELF-COMPACTING CONCRETE

2020 ◽  
Vol 60 (4) ◽  
pp. 359-368
Author(s):  
John Wasiu ◽  
Fashina Ayoola Oluwatosin
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Agricultural Waste ◽  
Modulus Of Rupture ◽  
Beam Specimen ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Compressive Strength Test ◽  
Mineral Additive ◽  
Pozzolanic Properties

Self-compacting concrete (SCC) is a new concept of concrete mix which flows in a formwork and consolidates itself without the need for compaction. Effectively compacting concrete can be very difficult especially in areas with a high number of reinforcement. Millet Husk Ash (MHA) and Rice Husk Ash (RHA) are agricultural waste materials obtained from farm and burnt to ashes to discard them since they are environmental waste. This research is focused on finding the pozzolanic potentials of MHA and RHA as a mineral additive in SCC to see if it will improve its properties rather than discarding them as environmental waste. Laboratory investigations were carried out on normally vibrated concrete (NVC) and SCC using MHA and RHA as an additive at a 10 % replacement with cement. Workability tests were carried out following the BS specifications. ASTM 293 C was used for the Flexural Capacity test on the beam specimen. The Results of the workability tests using MHA and RHA as mineral additive are within the specified standard values. The compressive strength test also revealed that the SCC using MHA is about 12.8 % higher than the RHA and NVC at 28 days with densities of 2487.5, 2516.5 and 2437.5kg/m<sup>3</sup> respectively. The Modulus of Rupture (MoR) and Split Tensile strength for MHA is 0-19.2 % and 17.2-22.2 % higher than the RHA and NVC respectively. It was concluded that the improvement in the pozzolanic properties of MHA and RHA may be due to the content of Lime (CaO), Silica ((SiO<sub>2</sub>)), Alumina (Al<sub>2</sub>O<sub>3</sub>), Iron oxide (Fe<sub>2</sub>O<sub>3</sub>) being greater than 70 % and in an accordance with BS 618 code. It is concluded that the MHA and RHA can find suitable applications in the SCC as a mineral additive rather than discarding them as environmental waste.

Potential Synthesis of Solar-Grade Silicon from Rice Husk Ash

2015 ◽  
Vol 242 ◽  
pp. 41-47 ◽  
Author(s):  
B.O. Ayomanor ◽  
Karen Vernon-Parry
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Direct Reduction ◽  
Agricultural Waste ◽  
Waste Product ◽  
Partial Solution ◽  
Hydrometallurgical Process ◽  
Solar Grade Silicon ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon

Rice husk, an agricultural waste product obtained in large quantities in many countries including Nigeria, is very rich in siliceous materials. It has been known for several decades that, with careful processing, rice husk can be a source of metallurgical grade silicon [1]. The question remains as to whether rice husk ash (RHA) can be purified by a cost-effective, low technology route to produce solar-grade silicon suitable for use in photovoltaic devices. In Nigeria this would have the benefit of transforming large volumes (> 600,000 tonnes per annum) of agricultural waste into a partial solution to that country's issue with energy distribution.In this work, high purity silica has been prepared from RHA (ashed at 700°C for 5 and 12 hours) using a hydrometallurgical process. We report on the effect of natural variations in the rice husk composition on the effectiveness of the hydrometallurgical purification; the effectiveness of each stage of the hydrometallurgical process in removing impurity elements. While the hydrometallurgical purification of RHA is effective in removing impurities such as Ti and Fe to levels below the limits of detection of X-ray fluorescence (XRF), B and P levels need to be reduced to < 1017cm-3 well below the detection limits of XRF. The resultant silica has been subsequently reduced to metallurgical-grade silicon (MG-Si) by direct reduction using Mg powder.

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