Results 21 to 30 of about 49,103 (280)

Degradation of Shotcrete Materials Subjected to Sulfate and Chloride Attack in Varying Exposure Regimes

Advances in Civil Engineering, 2021
Durability of in situ shotcrete under external sulfate attack was investigated, taking into consideration the addition of mineral admixtures, along with the presence of chloride ions.
Ruiqiang Zhao, Lihao Xu, Jun Yang, Yang Zou, Zhongya Zhang   +4 more
doaj   +1 more source

Activation of Blast Furnace Slag with CFB Fly Ash as a Supplementary Binder Material: Hydration Products and Effects of Sulfate Attack

Crystals, 2021
Circulating Fluidized Bed (CFB) combustion is a clean technology for burning, with advantages of adapting to a large variety of fuel, high combustion efficiency, lower NOx emissions, and stable operation. The residue collected from the ash-hoppers of the
Guan-Yu Chen, Wei-Hsing Huang
doaj   +1 more source

Diffusion-reaction modelling of the degradation of oil-well cement exposed to carbonated brine [PDF]

, 2017
The essential aspects of a diffusion-reaction model in development for the degradation process of oil-well cement exposed to carbonated brine are presented in this paper.
Carol, Ignacio, Llaudat, J., López, C.M., Martínez, A.   +3 more
core   +3 more sources

Pyrite oxidation under initially neutral pH conditions and in the presence of Acidithiobacillus ferrooxidans and micromolar hydrogen peroxide [PDF]

, 2012
Hydrogen peroxide (H2O2) at a micromolar level played a role in the microbial surface oxidation of pyrite crystals under initially neutral pH. When the mineral-bacteria system was cyclically exposed to 50 μM H2O2, the colonization of Acidithiobacillus ...
Lin, C., Ma, Y.
core   +2 more sources

Lime stabilisation for earthworks: a UK perspective [PDF]

, 2014
Lime stabilisation is a versatile technique applied during earthworks operations. Modern soil recycling units are much more efficient at pulverising fill material and intermixing the added binder/water than machinery available 20 years ago.
Beetham P, Bell FG, Bergado DT, Bin S, Bohn HL, BSI, BSI, BSI, Davidson LK, Diamond S, Eades JE, Greaves HM, Highways Agency, Highways Agency, Highways Agency, Holt CC, Ingles OG, John Bateman, Longworth I, McAllister LD, Mitchell JK, Neil Dixon, Paul Beetham, Paul Fleming, Perry J, Petry TM, Reeves GM, Robert Hutchison, Rowell DL, Sherwood PT, Sherwood PT, Snedker EA, Stocker PT, Sweeney DA, Taylor HFW, Tom Dijkstra, Van Olphen H, Winter NB   +37 more
core   +2 more sources

Numerical simulation of cementitious materials degradation under external sulfate attack [PDF]

Cement and Concrete Composites, 2010
Abstract A numerical methodology is proposed in this paper to simulate the degradation of cementitious materials under external sulfate attack. The methodology includes diffusion of ions in and out of the structure, chemical reactions which lead to dissolution and precipitation of solids, and mechanical damage accumulation using a continuum damage ...
Sloot, H.A. van der, Meeussen, J.C.L., Kosson, D.S., Sarkar, S., Mahadevan, S.   +4 more
openaire   +2 more sources

Natural Resources Exploitation in Sulfate-Resisting Portland Cement Manufacturing: Towards Quality Improvement and Reduction of Environmental Impact

Frontiers in Chemistry, 2022
Sulfate-resisting (SR) Portland cement is commonly used in building works to improve concrete’s durability against external sulfate attack. This attack is considered a very serious chemical aggression that causes damage and cracking of concrete ...
Islem Labidi, Adel Megriche
doaj   +1 more source

Evaluation of external sulfate attack (Na2SO4 and MgSO4): Portland cement mortars containing fillers

Revista IBRACON de Estruturas e Materiais, 2020
Sulfate attack is a term used to describe a series of chemical reactions between sulfate ions and hydrated compounds of the hardened cement paste. The present study aims to evaluate the physical (linear expansion, flexural and compressive strength) and ...
D. J. DE SOUZA, M. H. F. MEDEIROS, J. HOPPE FILHO   +2 more
doaj   +1 more source

Durability analysis and damage constitutive modeling of fiber-reinforced reactive powder concrete of drilling shaft in porous water-bearing rock stratum

Case Studies in Construction Materials, 2023
The drilling activities at the mining sites in western China generally involve an extremely high drilling depth and complex formation environment, and the external load borne by the drilling shaft lining is also very high.
Yu Fang, Zhishu Yao, Xianwen Huang, Xinwei Li, Yongjie Xu, Kun Hu, Siyuan Shu   +6 more
doaj   +1 more source

Anticholinergic therapy for acute asthma in children. [PDF]

, 2012
Inhaled anticholinergics as single agent bronchodilators (or in combination with beta(2)-agonists) are one of the several medications available for the treatment of acute asthma in ...
Beakes, Beck, Benito Fernandez, Bever, Bratteby, British Thoracic Society, Brown, Browne, Calvo, Cook, Craven, Cugell, DeStefano, Ducharme, Everard, Goggin, Gross, Guill, Hayday, Iramain, Lew, Lin, Lung, Mallol, McDonald, Mirsadraee, National Asthma Council Australia, Ni, Plotnick, Pulejo, Quereshi, Qureshi, Rayner, Reisman, Rodrigo, Schuh, Sienra Monge, Storms, Storr, Tal, Timsit, Ulrik, Undem, Wade, Ward, Ward, Yeung, Youngchaiyud, Zimmerman, Zorc   +49 more
core   +2 more sources