scholarly journals Physical properties and hydration evolution of dispersant containing calcium aluminate cement compositions for endodontic applications

Cerâmica ◽  
2014 ◽  
Vol 60 (355) ◽  
pp. 366-370 ◽  
Author(s):  
A. P. Luz ◽  
V. C. Pandolfelli
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Calcium Aluminate ◽  
Dimensional Change ◽  
Calcium Aluminate Cement ◽  
X Ray Diffraction ◽  
Cement Pastes ◽  
X Ray ◽  
Polymeric Dispersant ◽  
Aluminate Cement

The purpose of this study was to evaluate the physical properties and hydration evolution of calcium aluminate cement (CAC) compositions containing an advanced dispersant. The compressive strength, dimensional change, apparent porosity and quantitative X ray diffraction analysis (XRD) of the cement pastes were carried out over 1-15 days of curing (with the samples immersed in distilled water) at 37 ºC. The addition of a polymeric dispersant to the selected CAC (Secar 71) resulted in higher, but suitable expansion of the cement samples, and improved uniaxial compressive strength reaching values in the range of 73-87 MPa after 15 days. Quantitative XRD results also showed that C3AH6 and Al(OH)3 were the main phases detected during the cement hydration process, but CAH10 and C2AH8 were also found due to the higher water availability in the curing environment. According to the attained results, it could be concluded that the dispersant containing calcium aluminate cement compositions have the potential to be used as endodontic materials.

Different Chlorides Attack on the Hydration of Calcium Aluminate Cement at 5~40°C

2021 ◽  
Vol 1036 ◽  
pp. 247-254
Author(s):  
Zhong Ping Wang ◽  
Yu Ting Chen ◽  
Xiang Peng ◽  
Ling Lin Xu
Keyword(s):  
Compressive Strength ◽  
Calcium Aluminate ◽  
Physical Adsorption ◽  
Calcium Aluminate Cement ◽  
Binding Ability ◽  
Cement Pastes ◽  
Thermal Analyzer ◽  
Chloride Attack ◽  
Different Temperatures ◽  
Aluminate Cement

Calcium aluminate cement (CAC) has excellent resistance to seawater erosion, but the mechanism remains to be explored. Effects of NaCl and CaCl2 on the hydration of CAC at 5, 20 and 40°C were investigated in this paper by X-ray diffraction(XRD), thermal analyzer(TG-DSC), scanning electron microscopy(SEM), acoustic and electroacoustic spectrometer. Results show that the varieties of chlorides have great impacts on the chloride binding ability, mechanical properties and microstructure of cement pastes at different temperatures. At 5°C and 20°C, the formation of C2AH8 is suppressed by chloride attack. Though the addition of NaCl promotes the formation of CAH10, CaCl2 leads to a denser microstructure and the improvement in compressive strength. At 40°C, C2AH8 disappears by chloride attack, while C3AH6 and Friedel’s salt increase. Comparing with the attack of CaCl2, NaCl contributes to the formation of C3AH6. Therefore, it results in a the retraction in compressive strength, ascribing to a coarser structure. In addition, although NaCl is superior in chemical binding ability, CaCl2 has better physical adsorption ability which dominants the binding process, and thus leading to greater amount of bonded chloride than that with NaCl. This research provides the oretical basis for the application of CAC in marine environment.

A new insight on alkaline hydrolysis of calcium aluminate cement concrete: Part I. Fundamentals

1996 ◽  
Vol 11 (7) ◽  
pp. 1748-1754 ◽  
Author(s):  
S. Goñi ◽  
C. Andrade ◽  
J. L. Sagrera ◽  
M. S. Hernández ◽  
C. Alonso
Keyword(s):  
Calcium Aluminate ◽  
Alkaline Hydrolysis ◽  
Degradation Process ◽  
Calcium Aluminate Cement ◽  
X Ray Diffraction ◽  
Cement Concrete ◽  
X Ray ◽  
Concrete Part ◽  
Hydrolysis Of ◽  
Aluminate Cement

In this work a hypothesis to explain the alkaline hydrolysis degradation process of calcium aluminate cement concrete (CACC) is presented. The hypothesis is based on x-ray diffraction (XRD) data of some samples taken from real Spanish CACC structures. The identification from XRD data of a hydrated alkaline aluminate could serve as a guide to differentiate both processes of normal carbonation and alkaline hydrolysis.

Effect of Firing Temperature on Mechanical and Physical Properties of Porcelain Balls as Grinding Media

2017 ◽  
Vol 888 ◽  
pp. 37-41
Author(s):  
Hasrul Yahya ◽  
Mohd Roslee Othman ◽  
Zainal Arifin Ahmad
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Water Absorption ◽  
Firing Temperature ◽  
Chemical Resistance ◽  
Firing Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grinding Media ◽  
Mechanical And Physical Properties

Porcelain balls as grinding media are produced by firing process of clay, quartz and feldspar mixtures. This application need high technological properties such as high compressive strength and hardness, wear resistance, low water absorption and excellent chemical resistance. These properties are associated with higher firing temperatures. The porcelain balls were prepared by mixing 30 wt.% clay, 40 wt.% feldspar and 30 wt.% quartz. The samples were sintered at 1200°C, 1230°C, 1250°C, 1270°C and 1300°C for 2 hours with heating rate of 3°C/min. Both green powder and fired samples were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM).The properties of the fired samples were evaluated by compressive strength, hardness, shrinkage, water absorption, bulk density, and porosity measurement. Increasing of compressive strength, hardness and density are associated with increasing of firing temperatures. Porcelain balls PB1 and PB2 can be produced as grinding media with optimum mechanical and physical properties at firing temperature 1270°C and 1250°C, respectively.

Porosity–strength relation in calcium aluminate cement pastes

2003 ◽  
Vol 33 (11) ◽  
pp. 1801-1806 ◽  
Author(s):  
T Matusinović ◽  
J Šipušić ◽  
N Vrbos
Keyword(s):  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Cement Pastes ◽  
Aluminate Cement
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