scholarly journals Rice Husk Ash as an Admixture of M30 grade Concrete Exposed to Sulfate Environment

2018 ◽  
Vol 7 (3.31) ◽  
pp. 6
Author(s):  
P V.Rambabu ◽  
G V.RamaRao
Keyword(s):  
Experimental Data ◽  
Magnesium Sulfate ◽  
Rice Husk ◽  
Sodium Sulfate ◽  
Rice Husk Ash ◽  
Sulfate Attack

 In the present critique, Rice Husk Ash (RHA) partly replaced with cement in the quotient of 0%, 5%, 10%, 15%, and 20% to fruitage M30 grade Concrete. Concrete cubes divulged to Magnesium Sulfate and Sodium sulfate concentrations of 1%, 3% and 5% for the perpetuation of 28, 60and 90 days.   The Experimental data demonstrate that RHA improved the counteraction to sulfate attack on concrete and can be used as an Admixture, 10% as most favorable replacement quotient of RHA in 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.

Accelerate Thaumasite Formation in Cement-Limestone Powder Paste by Internal Adding Method

2011 ◽  
Vol 250-253 ◽  
pp. 22-27 ◽  
Author(s):  
Chang Cheng Li ◽  
Yan Yao ◽  
Ling Wang
Keyword(s):  
Magnesium Sulfate ◽  
Sodium Sulfate ◽  
Calcium Sulfate ◽  
Sulfate Attack ◽  
Limestone Powder ◽  
Resonance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cement Based Materials ◽  
Internal Sulfate Attack

Cement-limestone powder pastes added with 10% magnesium sulfate, sodium sulfate, and calcium sulfate respectively were stored in water at (5±2) °C to accelerate thaumasite formation. The pastes were inspected visually at intervals. And the formation of thaumasite was identified and confirmed by X-ray diffraction (XRD), infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The results show that internal adding sulfate in cement-limestone powder paste is an efficient way to accelerate thaumasite formation, and the accelerated effect is magnesium sulfate> sodium sulfate> calcium sulfate. Cement-limestone paste containing 10% magnesium sulfate totally turns into grey-white mushy materials after 6 months immersion, and products are mainly thaumasite and gypsum. In addition, the amount of thaumasite increases along with time of internal sulfate attack in 15 months. XRD, IR, and NMR are powerful and reliable tools for identification of thaumasite in cement-based materials.

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.

Resistance to magnesium sulfate and sodium sulfate attack of mortars containing wheat straw ash

2000 ◽  
Vol 30 (8) ◽  
pp. 1189-1197 ◽  
Author(s):  
Hasan Biricik ◽  
Fevziye Aköz ◽  
Fikret Türker ◽  
Ilhan Berktay
Keyword(s):  
Magnesium Sulfate ◽  
Wheat Straw ◽  
Sodium Sulfate ◽  
Sulfate Attack ◽  
Straw Ash

scholarly journals A comparable study on the deterioration of concrete under sodium sulfate and magnesium sulfate attack

2021 ◽  
Vol 787 (1) ◽  
pp. 012037
Author(s):  
Jiang Wu ◽  
Wen Zhu ◽  
Jiangxiong Wei ◽  
Mengxiong Tang ◽  
Shuo Zhang ◽  
...  
Keyword(s):  
Magnesium Sulfate ◽  
Sodium Sulfate ◽  
Sulfate Attack

A Properties of Concrete using LCD Waste Glass Subjected to Sulfate Attack

2018 ◽  
Vol 773 ◽  
pp. 233-237
Author(s):  
Gyeom Boo Kim ◽  
Il Young Jang ◽  
Seong Kyum Kim ◽  
Kwang Woon Lee
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Magnesium Sulfate ◽  
Sodium Sulfate ◽  
Glass Powder ◽  
Sulfate Attack ◽  
Waste Glass ◽  
Replacement Ratio ◽  
Waste Glass Powder ◽  
Better Than

In this study, it investigated the micropore changes by aging of LCD waste glass powder and investigated the effects of particle size and replacement ratio on sulfate erosion. Also, the comparison of the compressive strength with that of OPC concrete was carried out to evaluate the sulfate resistance of the LCD waste glass mixed concrete. As a result, resistance to sodium sulfate is better than magnesium sulfate.

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