A comparable study on the deterioration of limestone powder blended cement under sodium sulfate and magnesium sulfate attack at a low temperature

2020 ◽  
Vol 243 ◽  
pp. 118279 ◽  
Author(s):  
Meng Wu ◽  
Yunsheng Zhang ◽  
Yongsheng Ji ◽  
Wei She ◽  
Lin Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Magnesium Sulfate ◽  
Sodium Sulfate ◽  
Blended Cement ◽  
Sulfate Attack ◽  
Limestone Powder

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.

Rapid Quantitative Identification of Thaumasite

2013 ◽  
Vol 743-744 ◽  
pp. 186-192 ◽  
Author(s):  
Chang Cheng Li ◽  
Yan Yao ◽  
Ling Wang
Keyword(s):  
Magnesium Sulfate ◽  
Rietveld Refinement ◽  
Sulfate Solution ◽  
Sulfate Attack ◽  
Limestone Powder ◽  
X Ray Diffraction ◽  
X Ray ◽  
Identification Method ◽  
Quantitative Identification ◽  
Ir Analysis

To establish a quantitative identification method of thaumasite, internal doping method was used to accelerate thaumasite form of sulfate attack (TSA). A cement-limestone powder paste doped 10% of magnesium sulfate was immersed in water at (5±2) °C, while the blank was in 10% magnesium sulfate solution (by weight). Paste corrosion products were analyzed by infrared spectrum (IR), thermal analysis, nuclear magnetic resonance (NMR), and X-ray diffraction (XRD)/Rietveld refinement methods. The results show that the thaumasite formation was successfully accelerated by internal doping method. A lot of thaumasite formed after 6-15 months low temperature sulfate attack with gray mud-like material. IR analysis is able to be used to analysis thaumasite qualitatively, and Rietveld refinement was suitable to quantitative analysis of thaumasite. A rapid quantitative identification method of thaumasite including visual inspection, IR spectrum and XRD/Rietveld refinement was also established which will improve the accuracy and rapidness of TSAs research.

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

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.  

Role of ITZ in the Degradation Process of Blended Cement Concrete under Magnesium Sulfate Attack

2020 ◽  
Vol 32 (9) ◽  
pp. 04020235
Author(s):  
Kai Wu ◽  
Jiangfeng Long ◽  
Hao Han ◽  
Linglin Xu ◽  
Huisheng Shi ◽  
...  
Keyword(s):  
Magnesium Sulfate ◽  
Blended Cement ◽  
Degradation Process ◽  
Sulfate Attack ◽  
Cement Concrete

Deterioration of Cement Pastes Containing Limestone Powder with Different Fineness Exposed to Sulfate Environment at Low Temperature

2013 ◽  
Vol 423-426 ◽  
pp. 1076-1080
Author(s):  
Feng Chen Zhang ◽  
Ruo Yu Tang ◽  
Yun Zhao
Keyword(s):  
Fourier Transform ◽  
Low Temperature ◽  
Sulfate Attack ◽  
Limestone Powder ◽  
Test Results ◽  
X Ray Diffraction ◽  
Limestone Filler ◽  
Cement Pastes ◽  
Cement Production ◽  
X Ray

Limestone filler and aggregates are used widely in cement production and concrete mixing nowadays, which could be connected with thaumasite formation, and lead to a lack of durability further in sulfate environment. This work deals with the deterioration of cement pastes containing 35% w/w limestone powder with different fineness immersed in MgSO4 solution at 5°C±2°C for 15 weeks by. Erosion phases are discussed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). Test results show that visual deterioration of three kinds of cement pastes containing 400-mesh, 800-mesh and 1250-mesh limestone powders has little distinction, and erosion phases are all compound of ettringite, thaumasite, gypsum and brucite. Limestone powders with fineness of 400-mesh could supply enough carbonate needed for thaumastie formation. Increase of limestone fineness further could not accelerate deterioration of cement paste during the external magnesium sulfate attack at low temperature.

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