• Corpus ID: 4359795

The Effect Of Rice Husk Ash Used As Supplementary Cementing Material On Strength Of Mortar *

@inproceedings{Rajput2013TheEO,
  title={The Effect Of Rice Husk Ash Used As Supplementary Cementing Material On Strength Of Mortar *},
  author={Jayanti Rajput and R. K. Yadav and Rajiv Chandak},
  year={2013}
}

• J. Rajput, R. Yadav, R. Chandak
• Published 2013
• Materials Science, Engineering

This paper summarizes the experimental studies on strength characteristics of cement mortar in which rice husk ash (RHA) is used as partial replacement of ordinary Portland cement (OPC). Cement mortar paste were proportioned with varying dosages of RHA as partial replacement of OPC in the range of 5%to 30% by weight of cement. The compressive strength test was carried out as per relevant Indian standard code of practice. It has been observed that replacement of cement to the extent of approximately 10% by weight of cement was found to give the optimum results for the 28 days strength. KEYWORD Rice husk ash, mortar, pozzolanic material, strength. INTRODUCTION Cement mortar and concrete are the most widely used construction materials. According to the present state-of-the art concrete is not merely the four component system that is cement, water, fine aggregate and coarse aggregates. Now it is believed that it has many ingredients like fly ash, ground granulated blast furnace slag, silica fumes, rice husk ash, metakaoline and super plasticizers. One or more of these ingredients can be used in concrete and mortar as the situation demands. The use of pozzolanic material is as old as the art of concrete construction. The use of various pozzolans mixed with OPC in optimum proportions improve many qualities of mortar and concrete in fresh and hardened state. Rice husk ash is an agro waste material. Rice husk ash (RHA) is obtained by burning of rice husk in a controlled manner. When properly burnt, it has high silica content and can be used as an admixture in mortar and concrete. India produces about 122 million tons of paddy every year. About 20-22% rice husk is generated from paddy and 2025% of the total husk becomes as “RICE HUSK ASH” after burning. Each ton of paddy produces about 40 Kg of rice husk ash. Therefore it is a good potential to make the use of rice husk ash as pozzolanic material for making mortar and concrete. This paper represents the effect of rice husk ash on compressive strength of mortar when mixed in certain proportions in the ordinary Portland cement (OPC) as partial replacement of cement. LITERATURE REVIEW Some of the early researches have examined the use of rice husk ash (RHA) in concrete. RHA is highly pozzolanic material. The non crystalline silica and large specific surface area of the RHA is responsible for its high pozzolanic activity. Al Khalaf and A.Yousif (1984) have investigated the effect of rice husk on pozzolanic behavior of rice husk ash. They studied the actual range of temperature required to burn rice husk to get the desired pozzolanic product. They investigated that up to 40% replacement of cement with RHA can be made with no significant change in the compressive strength as compared to the controlled mix, if the rice husk is burnt under optimum temperature condition. Ismail and Waliuddin (1996) had worked on effect of rise husk ash on high strength concrete. They studied the effect the rise husk ash (RHA) passing 200 and 325 micron sieves with 1030 % replacement of cement on strength of HSC. Test result indicated that strength of HSC decreased when cement was partially replaced by RHA for maintaining same value of workability. They observed that optimum replacement of cement by RHA was 10 – 20 %. Ramezanianpour et al. 2009, 2010 concluded that burning rice husks at temperature below 700°C produces rice husk ashes with high pozzolanic activity. EXPERIMENTAL PROGRAMME Materials RICE HUSK ASH The rice husk ash obtained from FAIR FOOD OVERSEAS RICE MILL KATNI has been used in the analysis. The physical and chemical properties are listed in table 1 and table 2 respectively. Jayanti Rajput, R.K. Yadav, R. Chandak / International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com Vol. 3, Issue 3, May-Jun 2013, pp.133-136 134 | P a g e Table 1 Physical properties of RHA. S. No. Parameter (Physical Properties) Test Value Method of Test 1 Particles retained on 45 micron IS sieves (Wet Sieving) in % Max. 27.13 IS:1727:1967 Table 2 chemical properties of RHA. S. No. Parameters (Chemical Properties) Test Value Method of Test 1 Silica as SiO2 % w/w 83.6 IS:1727:1967 2 Calcium Oxide as CaO % w/w 0.84 IS:1727:1967 3 Magnesium Oxide MgO % w/w, 0.40 IS:1727:1967 4 Alumina as Al2O3 % w/w 0.76 IS:1727:1967 5 Ferric Oxide as Fe2O3 % w/w 0.64 IS:12423:1988 6 Loss on Ignition % w/w. 14.2 IS:1727:1967 7 Sulphuric Anhydride as SO3 % w/w 0.69 IS:1727:1967 CEMENT Ordinary Portland cement (OPC) conforming to IS 8112-1989 was used for this study. The OPC “jaypee” of 43 grade has been used, the physical properties are listed in table3 Table 3 Physical Property of procured OPC Particulars Test Results Requirements of IS: 8112-1989 Normal Consistency 29% 30% Setting Time (Minutes): •Initial 75 30 (minimum) •Final 450 600(maximum) WATER ordinary tap water has been used. FINE AGGREGATS standard sand is used for making cement mortar as per IS code 6501966. MIXPROPORTION The test specimen were prepared as per IS 650-1966, and IS 40311988. The cement mortar pastes were prepared using rice husk ash (RHA). The modified pastes incorporating the RHA from 5% to 30% by weight cement were prepared and strength results were compared with the strength of plain mix cubes. The mix proportions are summarized in table 4. Table 4 mix proportions Replacement of cement Quantity of RHA (gm) Quantity of cement (gm) Quantity of sand (gm) Quantity of water(gm)