Characterization of cement stabilized pond ash using FTIR spectroscopy

Jose, Anu; Nivitha, M. R.; Krishnan, J. Murali; Robinson, R. G.

doi:10.1016/j.conbuildmat.2020.120136

Cited by 81 publications

(20 citation statements)

References 34 publications

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“…Namely, the water bands (H 2 O) are usually correlated with the peaks in the 3500 -3700 cm -1 region. These peaks are caused by the υ3 vibration of water in cementitious materials [24][25][26]. The recorded band at approximately 3640 cm −1 also highlights the presence of mineral portlandite [27], which was detected by XRD analysis.…”

Section: Results and Discussion 31 Characterization Of Mortars With Micro Silica Additionmentioning

confidence: 97%

“…This is in agreement with the results of XRF and XRD analyses which identified high percentage of CaO and calcium based cement minerals. Assumption is that effects occurring in this sequence of the FTIR spectra are caused by the hydration process and the bending υ2 vibration of irregularly bound water [24][25][26]. Also, C-O bond which shows strong bands at 1363 cm −1 and 1364 cm −1 is correlated to monocarbo-aluminate and hemicarbo-aluminate [27].…”

Section: Results and Discussion 31 Characterization Of Mortars With Micro Silica Additionmentioning

confidence: 99%

“…Also, several additional small Si-O bands located in vicinity of 500 cm -1 were registered in mortar samples. The Si-O in FTIR spectra is assumed to reflect the dissolution of alite and the polymerization of silica to form calcium silicate hydrate C-S-H [24][25][26].…”

Section: Results and Discussion 31 Characterization Of Mortars With Micro Silica Additionmentioning

confidence: 99%

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Cavitation properties of rendering mortars with micro silica addition

et al. 2021

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Micro-silica is a highly efficient mineral additive whose role is reflected in improvements of microstructure packing, strength and durability of non-shaped composite building materials such as concrete and mortar. A comparative study of performances of rendering mortars with different quantities of micro silica was conducted. The experimental program included production of reference mortar based on Portland cement and quartz sand (CM) and three mortars with 5, 10, and 15 % addition of micro silica (SCM-5, SCM-10, and SCM-15). The effect that micro silica addition has on the thermal behavior and mechanical properties of mortars was discussed. Hydration mechanisms and thermally induced reactions were studied at temperatures ranging from ambient to 1100 ?C by differential thermal analysis. The results were supported by X-ray diffraction analysis. The cementing efficiency of micro silica was assessed by cavitation erosion test. The changes in the morphology of mortar samples prior and upon cavitation testing were monitored by means of the scanning electron microscope imagining. It was found that 5 % of superfine micro silica (SCM-5 mortar) has positive effects on mechanical strengths (15 % increase in compressive strength) due to microstructure densification arising from the successive filling of voids by the micro silica. Addition of micro silica also improved the cavitation erosion resistance in comparison with reference cement mortar (SCM-5 showed cavitation velocity as low as 0.09 mg/min). This qualifies mortars with micro silica addition as building materials which can be safely employed in potential hydro-demolition environment.

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Section: Results and Discussion 31 Characterization Of Mortars With Micro Silica Additionmentioning

confidence: 97%

Section: Results and Discussion 31 Characterization Of Mortars With Micro Silica Additionmentioning

confidence: 99%

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Cavitation properties of rendering mortars with micro silica addition

et al. 2021

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“…The band detected at 979.96 cm −1 in SSA is mainly associated with the stretching vibration of Si-O-Si(Al) [ 59 , 60 ] while the peak appearing at around 880 cm −1 , corresponds to CO 3− ion (carbonated ion, probably potassium carbonate) [ 61 , 62 , 63 , 64 ].…”

Section: Test Results and Discussionmentioning

confidence: 99%

Reactivity and Pozzolanic Properties of Biomass Ashes Generated by Wheat and Soybean Straw Combustion

Šupić¹,

Malešev²,

Радоњанин³

et al. 2021

Materials

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A sustainable use of locally available wastes from agriculture as supplementary cementitious materials (SCMs) is an alternative solution for the prevention of excessive raw material usage, reduction of CO2 emission and cost-effective concrete production. This paper studies the reactivity of non-traditional waste SCMs: Wheat straw ash (WSA), mixture of wheat and soybean straw ash (WSSA) and soybean straw ash (SSA), which are abundant as agricultural by-products in Serbia. The chemical evaluation using XRF technique, thermal analysis (TGA/DSC), XRD and FTIR methods were performed along with physical properties tests to investigate the feasibility of utilizing biomass ashes as cement substitutes. The obtained results demonstrate a high pozzolanic activity of WSA, which is attributed to a high reactive silica content of the ash and its satisfactory level of fineness. A wider hump in XRD pattern of WSA compared to WSSA and SSA confirmed that it abounds in amorphous (reactive) phase. The insufficient activity index of soybean-based biomass ashes, characterized with a low silica content, was improved by additional grinding and/or blending with amorphous silica-rich material. This points out the mechanical activation, i.e., grinding procedure, and chemical activation, i.e., modification of the chemical composition, as techniques efficient at producing pozzolanic materials from biomass wastes. Tested biomass ashes are characterized with negligible leaching values of heavy metals, thereby satisfying eco-friendly principles of SCM utilization. The application of biomass ashes as SCMs leads to substantial cost savings, as well as benefits to the environment, such as lower consumption of cement, reduction of CO2 emissions during the production of cement and sustainable waste management.

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“…This indicates that the types of hydration products are the same in the case of different curing ages and nano-SiO 2 contents. The absorption peak at 3643–3645 cm −1 is caused by the –OH stretching vibration of Ca(OH) 2 [ 40 , 41 ]. It can be found that the wave number slightly increases as the content of nano-SiO 2 increases, showing that the bond energy of –OH in Ca(OH) 2 is improved; that is to say that the amount of CH crystals increases as the content of nano-SiO 2 increases.…”

Section: Hydration Mechanisms Of Hcgamentioning

confidence: 99%

High-Fluidization, Early Strength Cement Grouting Material Enhanced by Nano-SiO2: Formula and Mechanisms

Ren

Zhao

et al. 2021

Materials

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Cement grouting material is one of the most important materials in civil construction at present, for seepage prevention, rapid repair, and reinforcement. To achieve the ever-increasing functional requirements of civil infrastructures, cement grouting materials must have the specific performance of high fluidization, early strength, and low shrinkage. In recent years, nanomaterials have been widely used to improve the engineering performance of cement grouting materials. However, the mechanisms of nanomaterials in grouting materials are not clear. Hence, a high-fluidization, early strength cement grouting material, enhanced by nano-SiO2, is developed via the orthogonal experimental method in this study. The mechanisms of nano-SiO2 on the microstructure and hydration products of the HCGA, in the case of different curing ages and nano-SiO2 contents, are analyzed through scanning electron microscopy tests, X-ray diffraction tests, differential scanning calorimetry tests, and Fourier transform infrared spectroscopy tests.

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Characterization of cement stabilized pond ash using FTIR spectroscopy

Cited by 81 publications

References 34 publications

Cavitation properties of rendering mortars with micro silica addition

Cavitation properties of rendering mortars with micro silica addition

Reactivity and Pozzolanic Properties of Biomass Ashes Generated by Wheat and Soybean Straw Combustion

High-Fluidization, Early Strength Cement Grouting Material Enhanced by Nano-SiO2: Formula and Mechanisms

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