Effect of magnesium and sulfate ions on durability of silica fume blended mixes exposed to the seawater tidal zone

Ganjian, Eshmaiel; Pouya, Homayoon Sadeghi

doi:10.1016/j.cemconres.2004.09.028

Cited by 107 publications

(54 citation statements)

References 15 publications

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“…Magnesium sulfate (MgSO 4 ) is considered the most aggressive agent for the Portland cement [27]. The attack of the MgSO 4 on C-S-H produces its decomposition to gypsum, brucite, and silica gel; this process is not directly related to ettringite formation [28].…”

mentioning

confidence: 99%

Study of durability of Portland cement mortars blended with silica nanoparticles

Tobón

Payá

Restrepo

2015

Construction and Building Materials

100

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In this paper the effects of nanosilica (NS) on porosity, capillary suction (UNE 8398:2008), compressive strength (ASTM C 349), and sulfate resistance (ASTM C 1012) were evaluated for mortars made with Portland cement (control) and partially replaced with a commercial NS suspension, in percentages by weight of 0, 1, 3, 5, and 10 %. Mortars with a water/binder (w/b) ratio of 0.55 and addition of superplasticizer, for flow correction, were prepared. NS showed that, it has an important role in pore refining, decreasing the total volume of pores and their diameters.Samples containing NS showed an important positive effect on the capillary suction and sulfate resistance. In the case of expansion due to sulfate attack, mortars with 5 and 10 % of NS decreased expansion by 90 and 95 % respectively after two years of immersion.

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confidence: 99%

Study of durability of Portland cement mortars blended with silica nanoparticles

Tobón

Payá

Restrepo

2015

Construction and Building Materials

100

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“…As for SW treated MK admixtured cement, the compressive strength was increased at an early age when compared to DW and GW. Since in addition to MK SW also accelerates cement hydration due to the presence of chloride and sulphate ions, these ions fill up the pores by reaction products and crystallization salts [17]. This enhances the hydration reaction, reduces the thickening time and hence consecutive strength developments will occur.…”

Section: Compressive Strength Measurementsmentioning

confidence: 98%

Influence of different types of water on strength, porosity and hydric parameters of metakaolin admixtured cement

Govindarajan

Gopalakrishnan

2009

Front. Mater. Sci. China

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The present research deals with strength, porosity and hydric behavior of metakaolin cement admixtured with different types of water. The hydration of ordinary Portland cement in the presence of 0%, 10%, 20% and 30% metakaolin treated with distilled, ground and sea water with the water to cement ratio of 0.4 was studied. The experimental results on setting time, strength, porosity and hydric parameters are reported. The results show that, metakaolin percentage increases in strength with a decrease in porosity. The observed results are discussed with SEM micrographs. Further, sea water accelerates the cement hydration at the early stages but retards it in the latter stages of hydration.

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“…Fly ash has been used as pozzolanic reactive cementitious material to make high-performance concrete in the severe conditions abundant in sulfates [2,3] . However, some controversies and confusion exist on the subject that effect of fly ash on performances of concrete subjected to the cyclic sulfate exposure [4][5][6] . Early strength agent is often added in fly ash concrete especially in winter, because of its unacceptable early age strength development.…”

Section: Introductionmentioning

confidence: 99%

Effect of fly ash and early strength agent on durability of concrete exposed to the cyclic sulfate environment

Yuan

Gong

et al. 2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The effect of fly ash and early strength agent on resistance of concrete to the cyclic sulfate environment was studied. Concrete specimens made with ordinary portland cement or ordinary portland cement incorporating fly ash with the replacement of 10% or 20%, or 1% early strength agent and fly ash with the replacement of 20%, were made and subjected to 250 cycles of exposure to the cyclic sulfate environment. Concrete properties including loss of mass, chloride ion diffusion coefficient, compressive strength and flexural strength were measured. Microstructure and chemical component of samples were determined by means of X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The experimental results indicated that effect of fly ash on the cyclic sulfate resistance of concretes was mostly dependent on the amount of fly ash. Early strength agent improved performances of concrete with 20% fly ash exposed to cyclic sulfate environment.

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Effect of magnesium and sulfate ions on durability of silica fume blended mixes exposed to the seawater tidal zone

Cited by 107 publications

References 15 publications

Study of durability of Portland cement mortars blended with silica nanoparticles

Study of durability of Portland cement mortars blended with silica nanoparticles

Influence of different types of water on strength, porosity and hydric parameters of metakaolin admixtured cement

Effect of fly ash and early strength agent on durability of concrete exposed to the cyclic sulfate environment

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