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

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.

Sulfate resistance of calcium sulphoaluminate cement

2016 ◽  
Vol 1 (3) ◽  
pp. 131-139 ◽  
Author(s):  
Eric Bescher ◽  
Edward K. Rice ◽  
Chris Ramseyer ◽  
Seth Roswurm
Keyword(s):  
Sulfate Resistance ◽  
Sulphoaluminate Cement ◽  
Calcium Sulphoaluminate ◽  
Calcium Sulphoaluminate Cement

Effect of Gypsum on Hydration Degree and Structure of Hardened Paste of Alite-Strontium Calcium Sulphoaluminate Cement

2011 ◽  
Vol 306-307 ◽  
pp. 1024-1028
Author(s):  
Qiu Ying Li ◽  
Ling Chao Lu ◽  
Shou De Wang
Keyword(s):  
Compressive Strength ◽  
Cement Paste ◽  
Cement Clinker ◽  
Hardened Cement ◽  
Hydration Degree ◽  
Synthesis Conditions ◽  
Sulphoaluminate Cement ◽  
Calcium Sulphoaluminate ◽  
Calcium Sulphoaluminate Cement ◽  
Curing Age

Synthesis conditions and performance of alite-strontium calcium sulphoaluminate cement have been studied by introducing strontium calcium sulphoaluminate into Portland cement clinker. The effects of gypsum on compressive strength, hydration degree and structure of hardened alite-strontium calcium sulphoaluminate cement paste were studied in this paper. Composition and structure of the hardened cement paste were analyzed by XRD and SEM. Results show that appropriate content of gypsum could contribute to the hydration of alite-strontium calcium sulphoaluminate cement. When gypsum content is 9%, the compressive strengths for 1d, 3d and 28d curing age are 30.7MPa, 59.5MPa and 105.5MPa, and the corresponding hydration degree are 40.4%, 57.5% and 85.8%, respectively. The hydration products of alite-strontium calcium sulphoaluminate cement are mainly ettringite (AFt), Ca(OH)2, C-S-H gel. Large amount of AFt formed at early curing age provides a sound basis for early compressive strength, and a lot of C-S-H gel generated at later curing age increases the density of the hardened paste.

Determination of Tricalcium Silicates Crystal Forms in Belite-Barium Calcium Sulphoaluminate Cement

2014 ◽  
Vol 541-542 ◽  
pp. 204-208
Author(s):  
Yan Ting Zhao ◽  
Xi Chen ◽  
Ling Chao Lu ◽  
Yong Bo Huang ◽  
Jie Zhang
Keyword(s):  
Cement Clinker ◽  
X Ray Diffraction ◽  
Crystal Forms ◽  
Sulphoaluminate Cement ◽  
Cement System ◽  
Calcium Sulphoaluminate ◽  
Diffraction Peaks ◽  
Method Of Extraction ◽  
Calcium Sulphoaluminate Cement

Chemical method of extraction was adopted in the study, and aqueous solution of potassium hydroxide and sucrose (KOSH) was used to obtain the clinker rich in silicate phases (alite and belite) in order to get the crystal forms of tricalcium silicates (C3S) in the belite-barium calcium sulphoaluminate cement clinker. The crystal forms of C3S were finally determined by XRD (X-ray diffraction) spectrums through its characteristic windows of the diffraction spectrums. Results shows that, C3S exists in the innovative cement system mainly in the form of M1; C2.75B1.25A3can completely dissolve in KOSH solution while its dissolution is inhibited in the cement system; after KOSH treatment, diffraction peaks of C4AF disappear totally and peaks of C3A has weakened to great extent; for the cement clinker, the clinker ground for 90min has the best extraction rate.

Influences of Microelement on Microstructure and Mechanical Performance of Alite-Strontium Calcium Sulphoaluminate Cement

2010 ◽  
Vol 168-170 ◽  
pp. 466-471 ◽  
Author(s):  
Qiu Ying Li ◽  
Ling Chao Lu ◽  
Shou De Wang
Keyword(s):  
Mechanical Performance ◽  
Sintering Temperature ◽  
Cementitious Material ◽  
Cement Clinker ◽  
Testing Conditions ◽  
Sulphoaluminate Cement ◽  
Portland Cement Clinker ◽  
New Type ◽  
Calcium Sulphoaluminate ◽  
Calcium Sulphoaluminate Cement

Alite-strontium calcium sulphoaluminate cement, a new type of cementitious material, is synthesized by combining strontium calcium sulphoaluminate with minerals of Portland cement clinker. The influences of excessive SO3 and SrO on the microstructure and performances of this cement are studied by XRD, SEM-EDS and lithofacies. The results show that the optimal excessive mass fraction of SO3 and SrO are 50% and 80%. The compressive strength of the cement prepared under the testing conditions reaches to 32.8MPa, 66.8MPa and 126.4MPa at 1d, 3d and 28d curing ages, respectively. The additions of SO3 and SrO are benefit to improve the content of strontium calcium sulphoaluminate, and promote the formation of alite at low sintering temperature.

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