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

Biricik, Hasan; Aköz, Fevziye; Türker, Fikret; Berktay, I.lhan

doi:10.1016/s0008-8846(00)00314-8

Cited by 53 publications

(25 citation statements)

References 10 publications

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“…Brucite layer is not stable forever and extensive growth of which upon continued exposure results in its cracking and breaking down. Such a trend in weight change has also been observed in results obtained by Biricik et al (35). CAPSCC mortar specimens, however, show a uniform weight increase not only in the first half of the exposure time, but also in the second half of which.…”

Section: Length Changesupporting

confidence: 82%

“…The amount of weight increase for CAPSCC mortar specimens in the first half of the exposure time is significantly lower than weight increases measured for PC2 and PC5 mortar specimens. Biricik et al (35), however, observed further weight changes in pozzolanic mortars. They suggested that the decomposition of CSH gel into gypsum and brucite due to the magnesium sulphate attack causes weight loss.…”

Section: Length Changementioning

confidence: 92%

“…In various studies, magnesium sulphate resistance of blended cements prepared by different supplementary cementing materials such as granulated blast furnace slag (GBFS), silica fume, and fly ash has been investigated (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36). Through doing a literature survey, it can be found out that very limited studies have been conducted on the resistance of phosphorus slag (PHS) content cements against sulphate attack so that the resistance of these types of blended cements is not well known.…”

Section: Research Backgroundmentioning

confidence: 99%

“…Lee et al (32), Diab et al (33), and İnan Sezer (34), however, reported a different behavior in which mortars with silica fume were severely damaged in the magnesium sulfate environment. Biricik and his colleagues (35) and also Chatveera and Lertwattanaruk (36) studied magnesium and sodium sulfate resistance of mortars containing wheat straw ash and observed a proper sulphateresistance. Chindaprasirt et al (37) proved that silica fume improved the strength and resistance to sulfate of fly ash-based geopolymer.…”

Section: Research Backgroundmentioning

confidence: 99%

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A composite cement of high magnesium sulphate resistance

2018

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This study investigates the magnesium sulphate resistance of chemically activated phosphorus slag-based composite cement (CAPSCC). Enough mortar specimens were prepared from phosphorus slag (80 wt.%), type II Portland cement (14 wt.%), and compound chemical activator (6 wt.%) and were exposed to 5% magnesium sulphate solution after being cured. Mortar specimens of both type II and V Portland cements (PC2 and PC5) were also prepared and used for comparison purpose. According to the test results, after 12 months of exposure, PC2, PC5 and CAPSCC exhibited 43.5, 35.2 and 25.2% reduction in compressive strength, 0.136, 0.110, and 0.026% expansion in length, and 0.91, 2.2, and 1.78% change in weight, respectively. Complementary studies by X-ray diffractometry and scanning electron microscopy revealed that CAPSCC has a very low potential for the formation of sulphate attack products, especially ettringite. The results confirm a high magnesium sulphate resistance for CAPSCC compared to PC2 and PC5. RESUMEN:Cemento compuesto de alta resistencia al sulfato de magnesio. Este trabajo aborda el estudio de la resistencia al sulfato de magnesio de un cemento compuesto con base de escoria de fósforo activada química-mente (CAPSCC). Se prepararon muestras de mortero a partir de escoria de fósforo (80% en peso), cemento Portland tipo II (14% en peso) y activador químico (6% en peso) y tras el curado, se expusieron a una solución de sulfato de magnesio al 5%. También se prepararon morteros de cementos Portland de tipo II y V (PC2 y PC5) que se usaron con fines comparativos. De acuerdo a los resultados obtenidos, después de 12 meses de exposición, PC2, PC5 y CAPSCC mostraron un 43.5, 35.2 y 25.2% de reducción en la resistencia a la compresión, 0.136, 0.110, y 0.026% de expansión en longitud, y 0.91, 2.2 y 1.78% de cambio en peso, respectivamente. Estudios complementarios por difracción de rayos X y microscopía electrónica de barrido revelaron que los cementos CAPSCC tienen un potencial muy bajo para la formación de productos de ataque de sulfato, especialmente etringita. Los resultados confirman una alta resistencia al sulfato de magnesio para CAPSCC en comparación con PC2 y PC5

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Section: Length Changesupporting

confidence: 82%

Section: Length Changementioning

confidence: 92%

Section: Research Backgroundmentioning

confidence: 99%

Section: Research Backgroundmentioning

confidence: 99%

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A composite cement of high magnesium sulphate resistance

2018

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“…The strength of the ash motor would have a certain improve when added with straw ash under the condition of low concentration of magnesium sulfate and sodium sulfate, but the flexural strength would reduce. The straw ash content should not exceed 24% [18].…”

Section: Straw Gray Concrete Research Results and Thementioning

confidence: 99%

The Research on Present Status of Straw Ash as High Performance Concrete Admixture

Wang¹,

Lai²,

Hao³

2017

Proceedings of the 2016 International Conference on Architectural Engineering and Civil Engineering

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Abstract-With wide application of the high performance concrete in Engineering, the research and application of high performance concrete admixture are attaching more and more attention by researchers. Although researches are more mature on the aspects of fly ash, slag, silica fume and other non-biological materials, the research is behindhand in the aspect of biological material such as straw ash, which contains a large amount of silica dioxide and has a certain amount of volcanic ash activity. It is considered that Heilongjiang Province as a major agricultural province, moreover, burning straw pollution is particularly serious in summer and fall. It is beneficial to manufacture straw ash high performance concrete and improve the strength and durability of the concrete. According to recent analysis on physical and chemical properties of the straw ash, it is completely feasible to improve the strength and durability of the concrete by adding straw ash to it in a reasonable method. It can be sure that, if after in-depth research, the straw ash as a concrete admixture would have a wide foreground in the future.

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Strength and microstructural analysis of concrete incorporating ash from sunflower seed shells combustion

Grubeša

Radeka

Malešev

et al. 2018

Structural Concrete

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The aim of the study involves determining the added value of shells of sunflower seeds ash (SSA) as a mineral admixture in concrete and the effects/mechanisms through which it affects the concrete microstructure. The chemical effect of this type of ash was estimated by examining its chemical composition, pozzolanic activity index, and SEM investigation while its physical effect was observed at the level of concrete with ash incorporated. Four concrete mixtures with different shares of cement replacement by ash were prepared (0, 5, 7.5, and 10%). The water to binder ratio was 0.5, and binder content 400 kg/m 3 in all mixtures. The properties of fresh and hardened concrete with ash incorporated were compared with the corresponding properties of the reference concrete. The results indicate that SSA achieved all the known possible effects of mineral admixtures; filler effect, heterogonous nucleation effect, dilution effect, and a certain degree of chemical effect. However, replacing more than 5% of cement mass with SSA will adversely affect mechanical properties of concrete. K E Y W O R D Sash from sunflower seed shells combustion, concrete, mechanical properties, mineral admixture effects, SEM analysis

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

Cited by 53 publications

References 10 publications

A composite cement of high magnesium sulphate resistance

A composite cement of high magnesium sulphate resistance

The Research on Present Status of Straw Ash as High Performance Concrete Admixture

Strength and microstructural analysis of concrete incorporating ash from sunflower seed shells combustion

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