Shotcrete with blended cement and calcium aluminate based powder accelerator for improved durability

Shotcrete ◽  
2010 ◽  
pp. 153-158
Author(s):  
A Ishida ◽  
M Iwasaki ◽  
A Araki
Keyword(s):  
Calcium Aluminate ◽  
Blended Cement

scholarly journals Properties of calcium aluminate blended cement incorporating iron-rich slag: Evolution over a curing period of 1 year

2021 ◽  
Vol 282 ◽  
pp. 122569
Author(s):  
Jennifer Astoveza ◽  
Romain Trauchessec ◽  
Ratana Soth ◽  
Yiannis Pontikes
Keyword(s):  
Calcium Aluminate ◽  
Blended Cement ◽  
Curing Period

An HREM study of superstructures in Ca4Al6SO16

1990 ◽  
Vol 48 (4) ◽  
pp. 1066-1067
Author(s):  
Y.G. Wang ◽  
H.Q. Ye ◽  
K.H. Kuo
Keyword(s):  
Calcium Aluminate ◽  
Structural Model ◽  
Bright Spot ◽  
Sulphur Atom ◽  
Synthetic Compound ◽  
Space Group ◽  
Lattice Images ◽  
Cubic Structure ◽  
Good Agreement

A synthetic compound Ca4Al6SO16 (usually abbreviated as C4A3S) obtained by mixing CaO, A12O3 and CaSO4 powders and finally sintered at 1380°C is a cement with excellent hydraulicity and greatly expanding in application. It is hydralysed rapidly by water to form predominatly calcium aluminate hydrates and therefore unlikly to occur naturally, although structurally it may be regarded as an end member of the sodalite-hauynite series of naturally occuring minerals. C4A3S has a cubic structure with ao=9.19Å and space group . Fig.1 is the projection viewed down axis, in which there are two sets of 8C position in , namely CaI and CaII, occupied by the calcium atoms, respectively, and the ratio of occupations in these two sets of positions is about 3:1. This suggests that the calcium atoms can freely occupy these sites in various degrees and usually they almost locates on the CaI positions. A through-focus series of the lattice images were found in good agreement with the simulated ones. Each bright spot in the image taken at Scherzer defocus correspounds to a colunm of sulphur atom in the structural model (Fig.1).

Quick Setting Property and Hydration of Portland Cement with Accelerating Agent Based on Calcium Aluminate.

2000 ◽  
Vol 49 (2) ◽  
pp. 209-214
Author(s):  
Minoru TAKEHIRO ◽  
Seishi GOTO ◽  
Koji IOKU ◽  
Hirotaka FUJIMORI
Keyword(s):  
Portland Cement ◽  
Calcium Aluminate ◽  
Agent Based

Preparation of near net size porous alumina‐calcium aluminate ceramics by gelcasting‐pore‐forming agent processs

2020 ◽  
Vol 103 (8) ◽  
pp. 4602-4610
Author(s):  
Bian‐Lei Hao ◽  
Ying Lang ◽  
Da‐Qian Bian ◽  
Chang‐An Wang
Keyword(s):  
Calcium Aluminate ◽  
Porous Alumina

scholarly journals Study by DTA/TG of the formation of calcium aluminate obtained from an aluminium hazardous waste

2009 ◽  
Vol 99 (3) ◽  
pp. 999-1004 ◽  
Author(s):  
A. López-Delgado ◽  
F. A. López ◽  
L. Gonzalo-Delgado ◽  
S. López-Andrés ◽  
F. J. Alguacil
Keyword(s):  
Hazardous Waste ◽  
Calcium Aluminate

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.

Sign in / Sign up

Export Citation Format

Share Document