Results 21 to 30 of about 3,590 (187)

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

Materiales de Construccion, 2014
Environmentally-friendly calcium sulphoaluminate clinkers were obtained from a mixture of aluminium dross, fluorgypsum, fly ash and CaCO₃ at temperatures within the range of 1100 to 1400 °C.
M. Gallardo, J. M. Almanza, D. A. Cortés, J. C. Escobedo, J. I. Escalante-García   +4 more
doaj   +1 more source

Thermodynamic Stability of Ettringite Formed by Hydration of Ye’elimite Clinker

Advances in Materials Science and Engineering, 2016
In order to save limited natural resources by utilising industrial by-products, this paper focuses on an entirely new application of fluidized bed combustion fly ash (FBCFA) into Portland composite cements.
Marcela Fridrichová, Karel Dvořák, Dominik Gazdič, Jana Mokrá, Karel Kulísek   +4 more
doaj   +1 more source

Incompatible building materials within the stereotomic Avalos sculptures of the Valley of Fallen (Madrid, Spain)

Materiales de Construccion, 2013
The examination of the recently open pit in top of head of the La Piety sculpture of Avalos confirms that the external outer of Black Limestone Calatorao (BLC) composite is made by slabs 20 cm thick joined with gypsum mortars without aggregates.
J. García-Guinea, G. Almendros, D. Benavente, V. Correcher, A. Pérez-García, L. Recio-Vázquez, S. Sánchez-Moral   +6 more
doaj   +1 more source

Removal of sulphate and arsenic from wastewater using calcium sulfoaluminate (ye’elimite)

Frontiers in Materials, 2022
Chemical precipitation is one of the most widely known methods for treatment of industrial wastewaters with high sulphate content, where sulphate can be precipitated as practically insoluble ettringite (Ca6Al2(SO4)3(OH)12·26H2O). This treatment method is
Emma-Tuulia Nurmesniemi, Milla Huhta, Maryam Derkani, Visa Isteri, Theodore Hanein, Tao Hu, Pekka Tanskanen, Ulla Lassi   +7 more
doaj   +1 more source

Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete

Materiales de Construccion, 2022
The determination of delayed ettringite formation (DEF) in hardened concrete relying simply on the identification of ettringite by electron microscopy or powder X-ray diffractometry can be imperfect because of the high risk of missing other possible ...
Y. Ando, H. Shinichi, T. Katayama, K. Torii   +3 more
doaj   +1 more source

Influence of calcium sulphoaluminoferrite on the cement stone structure [PDF]

E3S Web of Conferences, 2020
Usually to obtain expansive cements sulphoaluminate clinker or mix aluminate clinker with calcium sulphates (gypsum, hemihydrate, anhydrate) are used. This paper deals with the composition and properties of solid solution of calcium sulphoaluminoferrite.
Samchenko Svetlana, Zorin Dmitriy
doaj   +1 more source

Effects of Ettringite Formation on the Stability of Cement-Treated Sediments

Resources
This study explores the stabilization of dredged sediments classified as lean clay (CL) using hydrated lime, type III Portland cement, and compaction. While quicklime is commonly used in practice, this research explores alternative calcium-based binders ...
Inácio Soares Ribeiro, Diego de Freitas Fagundes, Helena Paula Nierwinski   +2 more
doaj   +1 more source

Possibilities of Sulphate Elimination from Mine Water [PDF]

Acta Montanistica Slovaca, 2004
The issue of „acid water“ (or AMD) is well known in the world for some centuries. In the Eastern Slovakia, the most acid surface water occurs in the area of old mine Smolník, which is closed and submerged for 15 years.
Heviánková Silvie, Vidlář Jiří, Tomislav Špaldon   +2 more
doaj  

The Effect of Cementitious Capillary Crystalline Waterproof Materials on the Hydration, Microstructure, and Mechanical Properties of Cement Pastes

Buildings
To apply the cementitious capillary crystalline waterproof materials (CCCWs) in real engineering practice, the mechanical properties and related mechanism of cement after adding CCCW are investigated in this study.
Zhonglin Li, Lijuan Li, Hailong Guo, Zhu Yang, Baifa Zhang   +4 more
doaj   +1 more source

DEF: As a form of sulfate attack

Materiales de Construccion, 1996
Delayed ettringite formation (DEF) is the term used to describe expansion of some heat cured portland cement concretes. Although meaningful progress has been made, the exact mechanism of the expansion itself is not entirely understood.
J. Skalny, V. Johansen, N. Thaulow, A. Palomo   +3 more
doaj   +1 more source