Results 11 to 20 of about 62,299 (282)

Influence of Internal Sulfate Attack on Some Properties of High Strength Concrete

Journal of Engineering, 2015
One of the most important problems that faces the concrete industry in Iraq is the deterioration due to internal sulfate attack , since it reduces the compressive strength and increases the expansion of concrete. Consequently, the concrete structure may
Nada Mahdi Fawzi, Zena K. Abbas, Hussein Ali Jaber   +2 more
doaj   +4 more sources

RISK ASSESSMENT OF A POTENTIAL EXTERNAL AND INTERNAL SULFATE ATTACK IN POZZOLANIC CEMENTITIOUS MATRICES

Mix Sustentável
This work evaluated the behavior of cementitious composites against internal and external attack by sulfates (ISA and ESA, respectively) over time, as well as the mitigating potential of Brazilian cements considered pozzolanic.
Luriane Zago Perondi, Nicole Pagan Hasparyk , Francieli Tiecher Bonsembiante   +2 more
doaj   +3 more sources

The effects of nano- and micro-particle additives on the durability and mechanical properties of mortars exposed to internal and external sulfate attacks

Results in Physics, 2017
In this study, the effects of micro-silica (MS), nano-silica (NS), class C fly ash (FA), and metakaolin (MK) on the durability and mechanical properties of mortars exposed to internal and external sulfate attacks were investigated.
Hasan Şahan Arel, Blessen Skariah Thomas   +1 more
doaj   +2 more sources

Effect of Lithium Mica Slag on the Internal Sulfate Attack of Cement Mortar

Applied Sciences
Lithium mica slag is a byproduct acquired via the sulfate method of lithium extraction, and it contains a certain quantity of soluble sulfates. The improper storage of lithium mica slag not only takes up a large amount of land resources, but also poses a
Na Liu, Bei Huang, Zebo Dong
doaj   +2 more sources

Internal and external sources of sulfate ions in portland cement mortar: two types of chemical attack

Cement and Concrete Research, 1988
Abstract This paper compares the effects of chemical attack on portland cement mortar from internal and external sulfate sources. Factors such as cement type, cement content, water to cement ratio, and addition of fly ash are studied with respect to expansion and strength development and it is found that substantial differences exist between the two ...
Chengsheng Ouyang, Antonio Nanni, Wen F. Chang   +2 more
exaly   +2 more sources

Effects of Sodium Sulfate Attack on Concrete Incorporated with Drying-Wetting Cycles

Advances in Civil Engineering, 2021
It has been widely observed that sulfate attack can damage the durability of concrete. This research investigated the mass loss and damage degree of concrete under sodium sulfate attack incorporated with drying-wetting cycles.
Fang Liu, Zhanping You, Rui Xiong, Xu Yang   +3 more
doaj   +1 more source

Behavior of Steel-Fiber Reinforced Lightweight Self-Compacting Concrete Containing LECA after the Exposure to Internal Sulfate Attack [PDF]

E3S Web of Conferences, 2023
For many years, lightweight concretes (LWC) have been utilized successfully in the construction of buildings because of their low specific weight, high thermal insulation capacity, and sound insulation.
Motar Shahad B., Awad Hadeel K.
doaj   +1 more source

Preparation of concrete specimen for internal sulfate attack analysis using electron backscatter diffraction [PDF]

International Journal of Applied Ceramic Technology, 2022
Abstract Concrete cores were obtained from houses in eastern Connecticut, USA, that had varying degrees of crumbling foundations and wall cracking. Electron backscatter diffraction (EBSD) was used simultaneously with energy dispersive X‐ray spectroscopy to investigate the degradation of these samples.
R. Sharon Uwanyuze, Lucas Enright, Jiyao Zhang, Stefan Schafföner   +3 more
openaire   +3 more sources

Concrete damage due to oxidation of pyrrhotite-bearing aggregate: a review

RILEM Technical Letters, 2021
Oxidation of pyrrhotite-bearing aggregates is one of the major causes of concrete damage in numerous buildings in Trois-Rivières in Canada and Connecticut in the USA.
Josée Duchesne, Andrea Rodrigues, Benoit Fournier   +2 more
doaj   +1 more source

Migraine and cluster headache show impaired neurosteroids patterns [PDF]

, 2019
Background: Perturbation of neuronal excitability contributes to migraine. Neurosteroids modulate the activity of γ-aminobutyric acid A and N-methyl-d-aspartate receptors, and might be involved in the pathogenesis of migraine.
Capi, M., Cicione, C., De Marco, C. M., Di Menna, L., Guglielmetti, M., Koverech, A., Lionetto, L., Maestri, M., Martelletti, P., Negro, A., Nicoletti, F., Passariello, F., Sabbatini, E., Simmaco, M.   +13 more
core   +1 more source