Tartaric acid effects on hydration development and physico-mechanical properties of blended calcium sulphoaluminate cements

2021 ◽  
pp. 104275
Author(s):  
Antonio Telesca ◽  
Milena Marroccoli ◽  
Luigi Coppola ◽  
Denny Coffetti ◽  
Sebastiano Candamano
Keyword(s):  
Mechanical Properties ◽  
Tartaric Acid ◽  
Calcium Sulphoaluminate

scholarly journals Effect of Tartaric Acid on the Printable, Rheological and Mechanical Properties of 3D Printing Sulphoaluminate Cement Paste

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2417 ◽  
Author(s):  
Mingxu Chen ◽  
Xiangyang Guo ◽  
Yan Zheng ◽  
Laibo Li ◽  
Zhen Yan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
3D Printing ◽  
Tartaric Acid ◽  
Apparent Viscosity ◽  
Setting Time ◽  
Sulphoaluminate Cement ◽  
Low Viscosity ◽  
Ultimate Deformation ◽  
Rapid Setting

Rapid setting and low viscosity of sulphoaluminate cement (SAC) make it difficult to be extruded by 3D printing (3DP) technique. In this study, the effect of tartaric acid (TA) on printability, rheology and mechanical property of 3DP SAC paste is investigated. The experimental results indicate that the setting time, hydration evolution and apparent viscosity of SAC paste can be well controlled by adding a proper amount of TA to satisfy the requirements of 3DP. An excellent structure of SAC paste with the ultimate deformation rate less than 10% can be printed without compromising mechanical strength.

scholarly journals Synthesis and mechanical properties of a calcium sulphoaluminate cement made of industrial wastes

2014 ◽  
Vol 64 (315) ◽  
pp. e023 ◽  
Author(s):  
M. Gallardo ◽  
J. M. Almanza ◽  
D. A. Cortés ◽  
J. C. Escobedo ◽  
J. I. Escalante-García
Keyword(s):  
Mechanical Properties ◽  
Industrial Wastes ◽  
Sulphoaluminate Cement ◽  
Calcium Sulphoaluminate ◽  
Calcium Sulphoaluminate Cement

scholarly journals Fluconazole-tartaric acid co-crystal formation and its mechanical properties

2021 ◽  
pp. 116-122
Author(s):  
Fikri Alatas ◽  
Nia Suwartiningsih ◽  
Hestiary Ratih ◽  
Titta Hartyana Sutarna
Keyword(s):  
Mechanical Properties ◽  
Tartaric Acid ◽  
Crystal Morphology ◽  
Active Pharmaceutical Ingredient ◽  
Raw Material ◽  
Molar Ratio ◽  
Crystal Formation ◽  
Polarization Microscopy ◽  
Scanning Calorimetry ◽  
Pxrd Pattern

Introduction: The formation of co-crystal is widely studied to obtain more favourable physicochemical properties than the pure active pharmaceutical ingredient (API). The co-crystal formation between an anti-fungal drug, fluconazole (FLU), and tartaric acid (TAR) has been investigated and its impact on mechanical properties has also been studied. Methods: The co-crystal of FLU-TAR (1:1) molar ratio was prepared by ultrasound-assisted solution co-crystallization (USSC) method with ethanol as the solvent. Polarization microscopy was used to observe the crystal morphology. Meanwhile, powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC) methods were used to characterise the co-crystal formation. The mechanical properties of the co-crystal, such as flowability and tablet-ability, were compared with pure FLU. Results: Photomicroscopes revealed the unique crystal morphology of the USSC product was different from the two starting components. The typical PXRD pattern was shown by the USSC product, which indicated the formation of FLU-TAR co-crystal. In addition, the DSC thermogram revealed 169.2°C as the melting point of the FLU-TAR co-crystal, which is between the melting points of FLU and TAR. It indicates that FLU-TAR co-crystal has better flowability and tablet-ability than pure FLU. Conclusion: FLU-TAR co-crystal is one of the alternative solid forms for a raw material in pharmaceutical tablet preparation because it has better mechanical properties than pure fluconazole.

scholarly journals Mechanical Properties and Free Formaldehyde Content of Particleboards Produced using Ammonium Sulphate-Based Hardener Partially Replaced with Tartaric Acid

2020 ◽  
Vol 71 (4) ◽  
pp. 389-393
Author(s):  
Nikola Španić ◽  
Vladimir Jambreković ◽  
Jaroslav Kljak ◽  
Goran Mihulja ◽  
Željko Milanović
Keyword(s):  
Mechanical Properties ◽  
Tartaric Acid ◽  
Ammonium Sulphate ◽  
Bending Strength ◽  
Urea Formaldehyde ◽  
Production Costs ◽  
Partial Replacement ◽  
Formaldehyde Content ◽  
Food Industries ◽  
Press Time

The use of resins, whose curing reaction takes place by high temperature and hardener addition, is inevitably involved in particleboard manufacturing process. In addition to commercial hardeners, such as ammonium sulphate, with the aim of optimizing the production process and reducing the production costs, a certain percentage of hardener can, among other things, be replaced with price affordable bio-based materials. Tartaric acid, that is its salts (tartrates), which are commercially produced for the needs of wine and food industries, are a part of the aforementioned group of products. Since tartaric acid is a relatively inexpensive, readily available, weak diprotic and aldaric acid, the question arises whether it can be used as a component of the hardener system for curing urea-formaldehyde resins that are commercially used in particleboard production. For that reason, in this paper, the influence of partial replacement of ammonium sulphate hardener with tartaric acid on the mechanical properties (bending strength, modulus of elasticity and internal bond) and free formaldehyde content of experimentally produced particleboards was examined. Boards thickness, density and moisture content were also determined. The test results suggest that tartaric acid has a beneficial effect on the above particleboard properties, but they also indicate that the extent of that effect is strongly dependent on panel press time.

scholarly journals Characterisation of Cements From Dominantly Volcanic Raw Materials of the Carpathian Bend Zone

2016 ◽  
Vol 44 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Timea Halmagy ◽  
Emilia Mosony ◽  
József Fazekas ◽  
Maria Spataru ◽  
Firuta Goga
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Raw Materials ◽  
Setting Time ◽  
Specific Density ◽  
Volcanic Tuff ◽  
Mineral Phases ◽  
Laboratory Investigations ◽  
Calcium Sulphoaluminate ◽  
Minor Compounds

Abstract This paper presents the results of laboratory investigations regarding the production of cements from local raw materials, such as limestone from Varghis, gypsum from Nucsoara, basaltic scoria from Racosul de Jos, volcanic tuff from Racosul de Sus, diatomite from Filia, and red mud from Oradea. The raw mixtures, based on modified Bogue calculations, contain limestone, gypsum, and one or two of the above-mentioned materials. The cements resulted from clinker grinding in a laboratory gas furnace at 1260-1300 °C, with one hour at the peak temperatures, and were characterised for Blaine specific surface area, specific density, and mineral phases. Physico-mechanical properties, such as water content for normal consistency, setting time, soundness, and compressive strength were also determined. Results show that these cements contain belite, ferrite, calcium sulphoaluminate, anhydrite, and some minor compounds.

Influence of MgO on Sintering and Property of Belite-Barium Calcium Sulphoaluminate Cement

2012 ◽  
Vol 152-154 ◽  
pp. 68-73
Author(s):  
Ling Chao Lu ◽  
Shou De Wang ◽  
Hui Wang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Compressive Strength ◽  
Low Temperatures ◽  
Sintering Process ◽  
Sulphoaluminate Cement ◽  
Calcium Sulphoaluminate ◽  
Orthogonal Tests ◽  
Calcium Sulphoaluminate Cement ◽  
Curing Age

The effect of MgO on performance of belite-barium calcium sulphoaluminate cement (B-CBAS) was investigated through orthogonal tests. The results show that the formation of C3S can be improved at low temperatures by mixing MgO. SO3 decreasing the viscosity of fused mass in sintering process was beneficial to solid solution of MgO in B-CBAS clinker. The solid solubility of MgO in B-CBAS was higher than that of Portland cement, which indicated that high-magnesium limestone can be used in B-CBAS. Even MgO content reached 5.14%, the soundness of B-CBAS was still in safe, whose compressive strength at 3d and 28d curing age were 49.1MPa and 81.9MPa. This indicated that this kind of cement has good mechanical properties.

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