Effect of Rice Husk Ash Fineness on the Properties of Concrete

2014 ◽  
Vol 554 ◽  
pp. 203-207 ◽  
Author(s):  
Sri Jayanti Dewi ◽  
Putra Jaya Ramadhansyah ◽  
Abdul Hassan Norhidayah ◽  
A. Aziz Md. Maniruzzaman ◽  
Mohd Rosli Hainin ◽  
...  
Keyword(s):  
Rice Husk ◽  
Permeability Coefficient ◽  
Rice Husk Ash ◽  
Gas Permeability ◽  
Blended Cement ◽  
Target Strength ◽  
Cement Concrete ◽  
Mechanical Grinding ◽  
Binder Ratio ◽  
Water To Binder Ratio

In the present research, the effect of rice husk ash fineness on the properties of concrete was studied. Eight different fineness grades of rice husk ash were examined. A rice husk ash dosage of 15% by weight of binder was used throughout the experiments. The water-to-binder ratio was 0.49 to produce concrete having target strength of 40MPa at 28 d. Workability, compressive strength and gas permeability tests were carried out to identify the properties of concrete. The results revealed that increasing the fineness of RHA by mechanical grinding was found to improve the workability of RHA blended cement concrete. In addition, the use of RHA3 with mean particle size of 9.52μm produces the concrete with good strength. Finally, significant improvement was observed in mixtures incorporating RHA in terms of permeability coefficient.

Strength of Concrete Containing Rice Husk Ash Subjected to Sodium Sulfate Solution via Wetting and Drying Cyclic

2014 ◽  
Vol 534 ◽  
pp. 3-8 ◽  
Author(s):  
Che Wan Che Norazman ◽  
Ramadhansyah Putra Jaya ◽  
Sri Jayanti Dewi ◽  
Badorul Hisham Abu Bakar ◽  
M.A. Fadzil
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Sodium Sulfate ◽  
Rice Husk Ash ◽  
Blended Cement ◽  
Sulfate Solution ◽  
Target Strength ◽  
Type I ◽  
Cement Concrete ◽  
Cement Replacement

The influences of different replacement levels of rice husk ash (RHA) blended cement concrete subjected to 5% Na2SO4 solution via wetting-drying cycles was evaluated in this study. RHA was used as a Portland cement Type I replacement at the levels of 0%, 10%, 20, 30%, and 40% by weight of binder. The water-to-binder ratio was 0.49 to produce concrete having target strength of 40 MPa at 28 days. The performance of RHA blended cement concrete on compressive strength, reduction in strength and loss of weight was monitored for up to 6 months. The results of the compressive strength test have been shown that use of RHA in blended cement has a significant influence on sulfate concentration. When increasing the replacement level of RHA, the strength of concrete also increases in comparison to OPC concrete (except RHA40) even exposed to 5% Na2SO4 solution. On the other hand, the reduction in strength and weight loss of specimens increased with increase in the exposure time. Generally, it can be said that the incorporation of rice husk ash as cement replacement significantly improved the resistance to sulfate penetration of concrete. Finally, RHA cement replacement in concrete mixed provided better resistance to sodium sulfate attack up to 6-month exposure.

scholarly journals Shrinkage and porosity in concretes produced with recycled concrete aggregate and rice husk ash

2019 ◽  
Vol 12 (3) ◽  
pp. 694-704
Author(s):  
V. CECCONELLO ◽  
B. R. C.SARTORI ◽  
M. P .KULAKOWSKI ◽  
C. S. KAZMIERCZAK ◽  
M. MANCIO
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Concrete Aggregate ◽  
Supplementary Cementitious Material ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Binder Ratio ◽  
Water To Binder Ratio

Abstract The admixture of recycled concrete aggregates (RCA) in new concretes is an interesting alternative in the efforts to mitigate environmental impacts. RCA may increase porosity and change properties of concretes. Rice husk ash (RHA) is employed as supplementary cementitious material may improve concrete properties. The present study investigated the shrinkage of concrete prepared with RCA and RHA, proposing a mathematical model to explain the phenomenon. Concretes were produced with 25% and 50% of coarse recycled aggregate as replacement of natural aggregate, 0%, 10%, and 20% of RHA as replacement of cement, and a water-to-binder ratio of 0.64. Water absorption and capillary and total porosities were analyzed on day 28. Shrinkage tests were conducted on days 1, 4, 7, 14, 28, 63, 91, and 112. The results point to a significant interaction between RHA and RCA.

Strength and permeability properties of concrete containing rice husk ash with different grinding time

2011 ◽  
Vol 1 (1) ◽  
Author(s):  
Ramadhansyah Jaya ◽  
Badorul Bakar ◽  
Megat Johari ◽  
Mohd Ibrahim
Keyword(s):  
Rice Husk ◽  
Permeability Coefficient ◽  
Rice Husk Ash ◽  
Gas Permeability ◽  
Concrete Strength ◽  
Partial Replacement ◽  
Curing Time ◽  
Concrete Permeability ◽  
Different Grain Size ◽  
Grinding Time

AbstractThe compressive concrete strength and the gas permeability properties over varying fineness of the rice husk ash were experimentally investigated. The relationships among them were analyzed. In this study eight samples made from the rice husk ashes with a different grain size were used, i.e. coarse original rice husk ash 17.96 μm (RHA0), 10.93 μm (RHA1) 9.74 μm (RHA2), 9.52 μm (RHA3), 9.34 μm (RHA4), 8.70 μm (RHA5), 6.85 μm (RHA6) and 6.65 μm (RHA7). The ordinary Portland cement was partially replaced with the rice husk ash (15 wt%). The test results showed that the RHA3 produced the concrete with good strength and low porosity. Additionally the strength of the concrete was improved due to the partial replacement of RHA3 material in comparison with normal coarse rice husk ash RHA0. On the other hand the influence of OPC and RHA materials on the concrete permeability was affected by the grinding time and age (i.e., curing time). The permeability coefficient decreased with the increasing of curing time. The relationships between compressive strength and permeability coefficient are greatly affected by curing times and are sensitive to the grinding cementitious systems.

scholarly journals PREDICTION OF STRENGTH AND SLUMP OF RICE HUSK ASH INCORPORATED HIGH-PERFORMANCE CONCRETE

2012 ◽  
Vol 18 (3) ◽  
pp. 310-317 ◽  
Author(s):  
Md. Nazrul Islam ◽  
Muhammad Fauzi Mohd Zain ◽  
Maslina Jamil
Keyword(s):  
Experimental Data ◽  
Compressive Strength ◽  
Rice Husk ◽  
High Performance ◽  
Rice Husk Ash ◽  
High Performance Concrete ◽  
Fine Aggregate ◽  
Aggregate Content ◽  
Binder Ratio ◽  
Water To Binder Ratio

This paper describes the development of statistical models to predict strength and slump of rice husk ash (RHA) incorporated high-performance concrete (HPC). Sixty samples of RHA incorporated HPC mixes having compressive strength range of 42–92 MPa and slump range of 170–245 mm were prepared and tested in the laboratory. These experimental data of sixty RHA incorporated HPC mixes were used to develop two models. Six variables namely water-to-binder ratio, cement content, RHA content, fine aggregate content, coarse aggregate content and superplasticizer content were selected to develop the models and ultimately to predict strength and slump of RHA incorporated HPC. The models were developed by regression analysis. Additional five HPC mixes were prepared with the same ingredients and tested under the same testing conditions to verify the ability of the proposed models to predict the responses. The results of the prediction of the models showed good agreement with the experimental data. Thus the developed models can be used to predict slump and 28-day compressive strength of RHA incorporated HPC. The research demonstrated that strength and slump of HPC could be successfully modeled using statistical analysis.

Properties of Mortar Containing Rice Husk Ash at Different Temperature and Exposed to Aggressive Environment

2012 ◽  
Vol 620 ◽  
pp. 87-93 ◽  
Author(s):  
Ramadhansyah Putra Jaya ◽  
Mohd Al Amin Muhamad Nor ◽  
Zainal Arifin Ahmad ◽  
Zakaria Mohd Amin
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compressive Strength Test ◽  
Binder Ratio ◽  
Different Temperatures ◽  
Good Potential ◽  
Water To Binder Ratio

The properties of mortar containing rice husk ash at varying temperatures were studied. Three rice husk ash samples were prepared at different temperatures and with various colors, i.e., 600°C (pink), 800°C (grey), and 1000°C (white), all were used for this study. Ordinary Portland cement (OPC), a well known universal binder, was partially replaced with rice husk ash at 10, 15, 20, and 30% by weight of binder. The water to binder ratio (W/B) of the mortar was kept constant at 0.45. The mortars were subjected to seawater or saturated Ca (OH)2 solution. The controlled and exposed mortars were characterized using X-ray diffraction, FTIR spectroscopy and compressive strength test. The results show that the amount of silica present in RHA are varied with burning temperature and colors, approximately in the range of 95 to 97%. White RHA produced higher compressive strength both in seawater and Ca (OH)2 solution. Finally, white RHA with 15% replacement was most suitable to be used as additive in OPC, and showed good potential for use in seawater applications and alkaline environment.

scholarly journals Solidification and Leachability of Cr (VI) in Rice Husk Ash-Blended Cement

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Neeraj Jain
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Setting Time ◽  
Blended Cement ◽  
X Ray Diffraction ◽  
Retention Capacity ◽  
Allowable Limit ◽  
X Ray ◽  
Curing Period ◽  
Leaching Procedure

Investigations carried out to study the effect of Cr (VI) (1000–3000 mg/l) on solidification and hydration behavior of Ordinary Portland cement (OPC) and rice husk ash (RHA) blended (10%, 20%, and 30%) cement show that addition of RHA accelerates final setting as compared to control samples (OPC) and retardation in setting time has been observed on increase in rice husk ash concentration (10%–30%). Solidification studies show that the compressive strength of controls and rice husk ash blended samples increases with increase in the curing period and maximum strength was observed with 20% RHA blended samples. With the increase in Cr (VI) concentrations, the strength of OPC and RHA blended samples decreases as compared to controls (without chromium). The results of Toxicity Characteristics Leaching Procedure (TCLP) test, (pH≅3), show that the retention capacity of OPC and RHA blended samples was in the range of 92% to 99% and the leached Cr (VI) concentration was under the allowable limit (5 mg/l) of U.S. EPA. The chemistry of influence of Cr (VI) on hydration of cement was examined by X-ray diffraction which shows the formation of various crystalline phases during solidification in rice hush ash blended cement.

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