Results 251 to 260 of about 62,299 (282)

New kinetic model to quantify the internal sulfate attack in concrete

Cement and Concrete Research, 2013
Kinetic and quantitative predictions of the internal sulfate attack (ISA) of concrete containing aggregates with iron sulfides have become a challenge, especially in the diagnosis of dams subject to expansive phenomenon. The present study proposes equations to quantify the expansion due to the iron sulfide oxidation and due to the secondary ettringite ...
Sergio Cavalaro
exaly   +2 more sources

Degradation mechanisms of cast-in-situ concrete subjected to internal-external combined sulfate attack

Construction and Building Materials, 2020
Abstract In this paper, an experimental study was conducted to reveal the degradation mechanisms of cast-in-situ concrete induced by internal-external combined sulfate attack. The internal sulfate attack of concrete was conducted by adding extra sodium sulfate in concrete mixtures.
Gaowen Zhao, Lin Li, Mei Shi
exaly   +2 more sources

Influence of internal curing and viscosity modifiers on resistance to sulfate attack

Materials and Structures/Materiaux Et Constructions, 2013
Sulfate attack is one of the common degradation mechanisms for concrete in severe environments. While various strategies for minimizing sulfate attack are well recognized, including using an ASTM C150 Type V cement, employing supplementary cementitious materials, and/or reducing water-to-cementitious materials ratio, this paper explores two new ...
Dale P Bentz
exaly   +2 more sources

Partially-exposed cast-in-situ concrete degradation induced by internal-external sulfate and magnesium multiple coupled attack

Construction and Building Materials, 2021
Abstract The safety of partially exposed concrete structures is threatened by the complicated corrosive sources in sulfate-rich saline areas. Experimental tests were conducted in the present study, taking internal sulfate, external sulfate-magnesium multiple combined attack into consideration, to simulate the corrosion process of partially exposed ...
Gaowen Zhao, Lin Li
exaly   +2 more sources

Curing Practices and Internal Sulfate Attack—The European Experience

Cement, Concrete, and Aggregates, 1999
Abstract The relationships between concrete curing procedures, materials composition, and internal sulfate attack damage will be discussed in view of the experience obtained in Europe in the 1970s and 1980s. The heat-treatment procedures that were introduced and specified to eliminate or minimize the damage will be highlighted and ...
J Skalny, FW Locher
openaire   +1 more source

Effect of internal sulfate attack on the properties of sulfate-resisting cement and alkali-activated slag

Geosystem Engineering, 2016
AbstractThis work aims at studying the effect of internal sulfate attack on the properties of sulfate-resisting cement (SRC) and alkali-activated slag (AAS). Blast-furnace slag was activated by 3% sodium hydroxide (NaOH) and 3% sodium silicate (Na2SiO3) by weight of slag.
H. A. Abdel Gawwad, S. Abd El-Aleem, A. S. Faried   +2 more
openaire   +1 more source

Internal sulfate attack in portland cement products - the role of microcracks

SP-170: Fourth CANMET/ACI International Conference on Durability of Concrete, 1997
Fourth CANMET/ACI International Conference Proceedings: 01 August 1997, Sydney ...
Fu, Y., Ding, J., Beaudoin, J. J.
openaire   +3 more sources

Expansion of portland cement mortar due to internal sulfate attack

Cement and Concrete Research, 1997
An exploratory test program was designed to determine the expansive potential of portland cement mortar due to internal sulfate attack initially moist-cured at high temperature. Expansion of cement mortars made with six different portland cements was measured.
Fu, Y., Ding, J., Beaudoin, J. J.
openaire   +2 more sources

An Internal Expansive Stress Model of Concrete under Sulfate Attack

Acta Mechanica Solida Sinica, 2016
Abstract Concrete experiences expansive deformation during sulfate attack due to internal expansive stress. Sulfate ions enter concrete pores, react with the pore solution, and produce ettringite. The production of ettringite explains the internal expansive stress that reduces the durability of concrete. In this study, the model of internal expansive
Hui Song, Jiankang Chen, Jinyang Jiang
openaire   +1 more source

Iron sulfide-related internal sulfate attack: microstructure and mechanism

Magazine of Concrete Research, 2018
The internal sulfate attack of concrete, which is caused by iron sulfide, was investigated, and the attack mechanism is also proposed in this study. The specimens were collected from a bridge pier suffering from pop-outs and showing visible rust staining.
Xueqin Han, Chaoming Pang, Renhui Gao, Shengping Wu, Wei Sun   +4 more
openaire   +1 more source