Effect of grinding of low-carbon rice husk ash on the microstructure and performance properties of blended cement concrete

2015 ◽  
Vol 55 ◽  
pp. 348-363 ◽  
Author(s):  
Harish Kizhakkumodom Venkatanarayanan ◽  
Prasada Rao Rangaraju
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Blended Cement ◽  
Low Carbon ◽  
Cement Concrete ◽  
Performance Properties ◽  
And Performance ◽  
Microstructure And Performance

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 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.

scholarly journals Sulfate Resistance of Rice Husk Ash Concrete

2018 ◽  
Vol 199 ◽  
pp. 02006 ◽  
Author(s):  
John Kamau ◽  
Ash Ahmed ◽  
Killian Ngong
Keyword(s):  
Compressive Strength ◽  
Magnesium Sulfate ◽  
Rice Husk ◽  
Sodium Sulfate ◽  
Rice Husk Ash ◽  
Cement Concrete ◽  
Strength Deterioration ◽  
Sulfate Resistance ◽  
Expansion Test ◽  
Sulfate Solutions

Durability of concrete is defined as its ability to resist deterioration after exposure to the environment of its use. This work investigates the performance of Rice Husk Ash (RHA) concrete in sodium sulfate (Na2SO4), magnesium sulfate (MgSO4) and combined Na2SO4 and MgSO4 solutions. Concrete bar specimens and cubes were prepared for expansion and strength deterioration tests respectively using RHA replacement at the 7.5% replacement by volume, which had achieved the highest compressive strength, as well as at the 30% replacement by volume, which was the highest replacement for the study. Strength deterioration tests were performed on the 7.5% replacement by the weight of cement. From the expansion test findings, it was concluded that at the 7.5% replacement, RHA could be used with an advantage over 100% cement concrete in MgSO4 environments, whereas at the 30% replacement, RHA could be used with an advantage over 100% cement concrete in both the Na2SO4 and mixed sulfate environments. RHA was also found to be more effective in resisting surface deterioration in all the sulfate solutions. The RHA specimens also exhibited superior strength deterioration resistance in comparison to the 100% cement specimens.

Effect of Milling Process for Rice Husk Ash on Mechanical Strength of Blended Portland Cement Mortars

2014 ◽  
Vol 600 ◽  
pp. 240-249
Author(s):  
Everton Jose da Silva ◽  
Maria Lidiane Marques ◽  
Antonio Rogério B. Vasconcelos ◽  
Jorge L. Akasaki ◽  
Mauro M. Tashima ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Agricultural Waste ◽  
Research Area ◽  
Milling Process ◽  
Low Carbon ◽  
Waste Products ◽  
Pozzolanic Reactivity ◽  
Cement Mortars ◽  
Sugar Cane Bagasse Ash

Nowadays, the reuse of waste products in the construction process is a priority research area. Several industrial and agricultural waste products have been investigated, such as fly ash, sugar cane bagasse ash and rice husk ash. This paper analyzes a very important aspect under intense discussion in the scientific community: the Rice Husk Ash (RHA) grinding process. This paper investigates a low carbon RHA with high pozzolanic reactivity produced under uncontrolled burning conditions. The compressive strength of mortar specimens prepared using both ground and natural RHA were tested for 3-56 days and the capillarity absorption was measured for mortars cured during 28 days. Very promising and interesting results were obtained using natural rice husk ash in the production of blended mortars.

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