Long-Term Efficiency of Silica Fume in Terms of Sulfate Resistance of Concrete Immersed in Sulfate Solutions and Seawater

The influence of the electrostatic precipitator ash “Zolest-bet” and silica fume on the sulfate resistance of Portland cement was studied. The evaluation criteria were the expansion, strength, density, and appearance of the samples, hardened in a 5% Na2SO4 solution starting from 3 days of age for 192 days at a temperature of 20 °C and 148 days at 40 °C. The mixture with the silica fume additive had the minimum expansion under the Na2SO4 action, and the mixture with the fly ash “Zolest-bet” additive had the greatest expansion. Zolest-bet ash in pure water shrank the mixture by 0.19 mm/m by the end of the hardening period, and it gave a linear expansion of 0.23 mm/m in a Na2SO4 solution after hardening. The mixture can be considered sulfate resistant at a given value of linear expansion. Despite the greatest expansion, the compressive strength of the samples with the Zolest-bet additive was found to be the highest at hardening in both environments. The flexural strength was found to be the highest after being in Na2SO4 solution. The sulfate resistance of the mixture with silica fume was higher than that of the mixture based on sulfate-resistant cement. This mixture did not have expansion in comparison with the initial length, instead it shrank, while the expansion of sulfate-resistant cement was 0.006% over the control period. The compressive strength of the mixture with the silica fume additive was slightly inferior to the strength of the mixture with Zolest-bet ash.

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Study on the Fatigue and Durability Behavior of Structural Expanded Polystyrene Concretes

Materials ◽

10.3390/ma12182882 ◽

2019 ◽

Vol 12 (18) ◽

pp. 2882 ◽

Cited By ~ 1

Author(s):

Quan You ◽

Linchang Miao ◽

Chao Li ◽

Huanglei Fang ◽

Xiaodong Liang

Keyword(s):

Cyclic Loading ◽

Cyclic Load ◽

Dynamic Performance ◽

Plain Concrete ◽

Expanded Polystyrene ◽

Structural Elements ◽

Sulfate Resistance ◽

Erosion Test ◽

Test Process

The fatigue and durability characteristics of structural expanded polystyrene concrete (EPS) are especially important when it was applied for structural elements in long-term service. In order to study the fatigue and durability behavior of structural EPS concrete, the long-term cyclic loading experiments and wetting–drying (W-D) cyclic experiments were conducted, respectively. The structural EPS concrete was found to have a relatively large damping and a fairly low dynamic elastic modulus under long-term cyclic load, which illustrated that it had a better energy absorption effect and toughness than plain concrete of the same strength level. Even if fine cracks appeared during the cyclic loading process, the relevant dynamic performance remained stable, which indicated that the structural EPS concrete had superior fatigue stability. In W-D cyclic experiments, the structural EPS concrete exhibited superior sulfate resistance. During the erosion test process, there was a positive correlation between the mass change and the evolution of the compressive strength of the structural EPS concrete, which indicated that ΔmB could be substituted for Δf to evaluate the degree of the structural EPS concrete eroded by sulfate attack. The study focuses on the fatigue performance and sulfate resistance of structural EPS concrete and is of important engineering value for promoting practical long-term operations.

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Determination of Sulfate Resistance of Concretes Containing Silica Fume and Fly Ash

Iranian Journal of Science and Technology Transactions of Civil Engineering ◽

10.1007/s40996-018-0160-x ◽

2018 ◽

Vol 43 (S1) ◽

pp. 219-230 ◽

Cited By ~ 2

Author(s):

A. Ferhat Bingöl ◽

H. Haghghipour Balaneji

Keyword(s):

Fly Ash ◽

Silica Fume ◽

Sulfate Resistance

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Sulfate Resistance of Rice Husk Ash Concrete

MATEC Web of Conferences ◽

10.1051/matecconf/201819902006 ◽

2018 ◽

Vol 199 ◽

pp. 02006 ◽

Cited By ~ 1

Author(s):

John Kamau ◽

Ash Ahmed ◽

Killian Ngong

Keyword(s):

Compressive Strength ◽

Magnesium Sulfate ◽

Rice Husk ◽

Sodium Sulfate ◽

Rice Husk Ash ◽

Cement Concrete ◽

Strength Deterioration ◽

Sulfate Resistance ◽

Expansion Test ◽

Sulfate Solutions

Durability of concrete is defined as its ability to resist deterioration after exposure to the environment of its use. This work investigates the performance of Rice Husk Ash (RHA) concrete in sodium sulfate (Na2SO4), magnesium sulfate (MgSO4) and combined Na2SO4 and MgSO4 solutions. Concrete bar specimens and cubes were prepared for expansion and strength deterioration tests respectively using RHA replacement at the 7.5% replacement by volume, which had achieved the highest compressive strength, as well as at the 30% replacement by volume, which was the highest replacement for the study. Strength deterioration tests were performed on the 7.5% replacement by the weight of cement. From the expansion test findings, it was concluded that at the 7.5% replacement, RHA could be used with an advantage over 100% cement concrete in MgSO4 environments, whereas at the 30% replacement, RHA could be used with an advantage over 100% cement concrete in both the Na2SO4 and mixed sulfate environments. RHA was also found to be more effective in resisting surface deterioration in all the sulfate solutions. The RHA specimens also exhibited superior strength deterioration resistance in comparison to the 100% cement specimens.

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Long-term corrosion protection of arc spray Zn-Al-Si coating system in dilute chloride solutions and sulfate solutions

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2016.06.042 ◽

2016 ◽

Vol 302 ◽

pp. 398-409 ◽

Cited By ~ 6

Author(s):

Seiji Sugimura ◽

Jinsun Liao

Keyword(s):

Corrosion Protection ◽

Coating System ◽

Chloride Solutions ◽

Arc Spray ◽

Sulfate Solutions

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Appraisal of long-term effects of fly ash and silica fume on compressive strength of concrete by neural networks

Construction and Building Materials ◽

10.1016/j.conbuildmat.2005.08.009 ◽

2007 ◽

Vol 21 (2) ◽

pp. 384-394 ◽

Cited By ~ 117

Author(s):

Murat Pala ◽

Erdoğan Özbay ◽

Ahmet Öztaş ◽

M. Ishak Yuce

Keyword(s):

Neural Networks ◽

Compressive Strength ◽

Fly Ash ◽

Silica Fume ◽

Long Term Effects ◽

Compressive Strength Of Concrete

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Influence of Silica Fume Addition in the Long-Term Performance of Sustainable Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

Materials ◽

10.3390/ma10080890 ◽

2017 ◽

Vol 10 (8) ◽

pp. 890 ◽

Cited By ~ 13

Author(s):

José Ortega ◽

María Esteban ◽

Raúl Rodríguez ◽

José Pastor ◽

Francisco Ibanco ◽

...

Keyword(s):

Silica Fume ◽

Aggressive Medium ◽

Cement Grouts ◽

Long Term Performance ◽

Term Performance

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Experimental Research on the Durability of Inorganic Binder Stabilized Material with Soda Residue

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.629-630.189 ◽

2014 ◽

Vol 629-630 ◽

pp. 189-194 ◽

Cited By ~ 1

Author(s):

Yi Bo Yang ◽

Mei Ru Zheng ◽

Wen Ying Guo ◽

Heng Chang Wang

Keyword(s):

Silica Fume ◽

Experimental Research ◽

Frost Resistance ◽

Chloride Ion ◽

Mineral Admixture ◽

Urgent Problem ◽

Inorganic Binder ◽

Cold Area ◽

Negative Effect

The high contents of alkali ion and chloride ion in soda residue pollute environment. So how to treat the soda residue is an urgent problem to be solved in China. The soda residue can be used in inorganic binder stabilized materials. But the negative effect of soda residue is not studied. The impermeability, frost resistance, and chloride ion leaching of inorganic binder stabilize materials prepared by soda residue are studied. And the results as followings: (1) The permeability coefficients of cement/ mineral admixture-soda residue stabilized stone chip are very low, and they are good impermeable materials; (2) The frost resistance of cement-silica fume-soda residue stabilized stone chip is good, and silica fume is recommended to be used in cold area; (3) The mineral admixture has a better long-term immobilized effect on chloride ion than cement, and the ground granular blast-furnance slag is the best mineral admixture to immobilize the chloride ion.

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