scholarly journals The Wastes of Sanitary Ceramics as Recycling Aggregate to Special Concretes

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1275 ◽  
Author(s):  
Paweł Ogrodnik ◽  
Jacek Szulej ◽  
Wojciech Franus
Keyword(s):  
Calcium Aluminate ◽  
Compression Strength ◽  
Mechanical Tests ◽  
Calcium Aluminate Cement ◽  
Phase Content ◽  
Temperature Load ◽  
Strength Tests ◽  
Sample Structure ◽  
The Impact ◽  
Aluminate Cement

This article presents the results of research on the wastes of sanitary ceramics as an aggregate to concretes. The case of high temperature load was taken into account. Six concrete mixes were designed on Portland and calcium aluminate cement with various content of aerating admixture. Only the ground waste ceramics were used as an aggregate from one of the Polish sanitary ceramics plants. The abrasion test by Boehme blade of the designed concrete was conducted within the frame of study and compression strength tests on the cylindrical samples were performed as well. Some samples were initially annealed at 400 or 800 °C prior to strength tests. In order to determine the impact of annealing on the phase content and the concrete sample structure, the analyses on phase content (XRD—X-ray diffraction) and scanning electron microscopy (SEM) were conducted. The tests on compression strength demonstrated that there is considerable resistance of concrete containing ceramic aggregate and calcium aluminate cement to high temperatures. Abrasion tests confirmed that selected mixes have a high resistance to abrasion and they can be applied as a concrete coating. The possibility of ceramic cullet use as an aggregate to special concretes has been confirmed by the conducted research on specific features. Taking into consideration the available literature, the article presents widely conducted research in the area of the internal structure of concrete designed on the basis of recycled ceramic aggregate, the phase content of individual components, and basic mechanical tests both in normal temperatures and under thermal stress.

scholarly journals Experiment and numerical modelling of heat transfer inside calcium aluminate cement-based refractory concrete

2020 ◽  
Vol 61 (HTCS6) ◽  
pp. 139-147
Author(s):  
Tien Manh Tran ◽  
Hong Xuan Vu ◽  
Emmanuel Ferrier ◽  
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Calcium Aluminate ◽  
Refractory Concrete ◽  
Concrete Specimen ◽  
Calcium Aluminate Cement ◽  
Experimental Results ◽  
Factors Affecting ◽  
The Impact ◽  
Aluminate Cement

In the case of fire in infrastructure works, the bearing capacity of reinforced-concrete structures will be reduced due to the effect of high temperatures. So, the refractory concrete with good thermal properties contributes an important role in reducing the impact of fire on the durability of the building. Nowadays, calcium aluminate cement is widely used for that thanks to the thermal stability of the respective concrete by the high content of aluminum. This paper presents experimental and numerical results of heat transfer in cylindrical specimens of calcium aluminate cement-based refractory concrete. As experimental results, with a calcium aluminate content of about 50% in concrete, its thermal properties have been significantly improved in comparison with other types of cementitious concrete. The evolution of temperature as a function of time (inside and outside of the concrete specimen) was also recorded and analyzed. In the 3-D model, the thermal properties of refractory concrete were used from the previous experimental results. The results of this model were used to compare with experiments, then analyze and evaluate factors affecting the model results. The numerical model could also be exploited to determine the thermal parameters in the heat transfer in refractory concrete specimen.

scholarly journals The Effect of Fine-Ground Glass on the Hydration Process and Properties of Alumina-Cement-Based Composites

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4633
Author(s):  
Galyna Kotsay ◽  
Irmina Masztakowska
Keyword(s):  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Ground Glass ◽  
High Alumina ◽  
Cement Pastes ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Mortar Strength ◽  
The Impact ◽  
Aluminate Cement

This paper discusses studies regarding the impact of fine-ground glass additives on the hydration and properties of alumina cement pastes and mortars. Fine-ground glass was added to pastes and mortars instead of high-alumina cement and calcium aluminate cement in quantities of 5% and 10%. The findings are inconclusive as to the impact of glass on the properties of tested alumina cement types. The effect produced via the addition of glass instead of cement depends on the type of alumina cement used. Adding fine-ground glass to high-alumina cement enhances the paste’s density while improving paste and mortar strength. Using the same additive for calcium aluminate cement reduces its density and strength. The addition of glass to high-alumina cement adversely affects its strength at higher temperatures.

The impact of Al2O3 amount on the synthesis of CASH samples and their influence on the early stage hydration of calcium aluminate cement

2019 ◽  
Vol 45 (2) ◽  
pp. 2881-2886 ◽  
Author(s):  
Kestutis Baltakys ◽  
Anatolijus Eisinas ◽  
Jolanta Doneliene ◽  
Tadas Dambrauskas ◽  
Gabriele Sarapajevaite
Keyword(s):  
Calcium Aluminate ◽  
Early Stage ◽  
Calcium Aluminate Cement ◽  
Early Stage Hydration ◽  
The Impact ◽  
Aluminate Cement

The impact of mechanical grinding on calcium aluminate cement hydration at 30 °C

2019 ◽  
Vol 45 (11) ◽  
pp. 14121-14125 ◽  
Author(s):  
Kun Liu ◽  
Anbang Chen ◽  
Xuejun Shang ◽  
Liugang Chen ◽  
Lichun Zheng ◽  
...  
Keyword(s):  
Calcium Aluminate ◽  
Cement Hydration ◽  
Calcium Aluminate Cement ◽  
Mechanical Grinding ◽  
The Impact ◽  
Aluminate Cement

scholarly journals Physicochemical, Mineralogical, and Mechanical Properties of Calcium Aluminate Cement Concrete Exposed to Elevated Temperatures

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3855
Author(s):  
Amirmohamad Abolhasani ◽  
Bijan Samali ◽  
Fatemeh Aslani
Keyword(s):  
Temperature Rise ◽  
Calcium Aluminate ◽  
Elevated Temperatures ◽  
Ultrasonic Pulse Velocity ◽  
Pulse Velocity ◽  
Calcium Aluminate Cement ◽  
Cement Concrete ◽  
Sem Images ◽  
Strength Deterioration ◽  
Aluminate Cement

One commonly used cement type for thermal applications is CAC containing 38–40% alumina, although the postheated behavior of this cement subjected to elevated temperature has not been studied yet. Here, through extensive experimentation, the postheated mineralogical and physicochemical features of calcium aluminate cement concrete (CACC) were examined via DTA/TGA, X-ray diffraction (XRD), and scanning electron microscopy (SEM) imaging and the variation in the concrete physical features and the compressive strength deterioration with temperature rise were examined through ultrasonic pulse velocity (UPV) values. In addition, other mechanical features that were addressed were the residual tensile strength and elastic modulus. According to the XRD test results, with the temperature rise, the dehydration of the C3AH6 structure occurred, which, in turn, led to the crystallization of the monocalcium dialuminate (CA2) and alumina (Al2O3) structures. The SEM images indicated specific variations in morphology that corresponded to concrete deterioration due to heat.

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