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Effect of sulphate ions in mixing water on cement mortar

2016-1-15  The results of this work showed that mixing water with high sulphate ions reduces the compressive strength development of cement mortar. This may lead to failure of concrete works. It was further observed that sulphate ions retards setting times both in PPC and OPC. This may affect workability of cement paste and hence its placem...

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Effect of Sulphate and Chloride Ingress on Selected

The sources of aggressive ions to the mortar/concrete may include deicing salts, seawater, groundwater, bacterial action in sewers, wastewater from industries, use of sulphate or chloride contaminated mix water, and natural gypsum in the aggregate, among others [ 1, 13 – 16 ].

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Effect of sulphate exposure on mortar consisting of

2020-3-1  Concrete usually experiences exposures to severe environmental conditions during its service life, especially in marine environment, where prolonged exposure to sulphate ions can cause severe strength loss. Sulphate attack can be classified into two categories, such as external sulphate attack and internal sulphate attack.

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Effects of mix composition and water–cement ratio on the

2007-3-1  The CH in the hardened cement paste reacts with sulfate ions to form gypsum. The deterioration of hardened mortar by the formation of gypsum goes through a process leading to a reduction of stiffness and strength loss; this is followed by expansion [12]. The volume of the resulting gypsum is also greater than the sum of its components.

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Effects of sulfate and magnesium ion on the chloride

2019-4-20  Jin et al. [32] reported that the presence of sulfate ions in a combined solutions of 5% Na 2 SO 4 and 3.5% NaCl decreased the chlorides ingress in concrete at early exposure period, while increased chloride penetration at the latter exposure period.

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Effect of Sulfates on Cement- and Lime-Stabilized Soils

Effect of Presence of Calcium Sulfates In the Soil Although it is possible that soil-cement might be attacked by water containing sulfate ions it is more likely that sulfate attack would originate from the presence of sulfates (usually calcium sulfate) in the soil itself.

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Influence of Sulfate Ions on Chloride Attack in Concrete

2020-7-11  Increase of sulfate concentration leads to reduction of the penetration depth in silica fume/control specimens. Regarding trass, adding 25 g l −1 sulfate concentration to 165 g l −1 NaCl leads to reduction of the penetration depth. Vice versa, 55 g l −1 sulfate results in an increase in this depth.

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Synergistic effects of sulfate and magnesium ions on

2019-12-30  However, when the concrete cover in contact with seawater, it is always subjected to aggressive ion attacks such as sulfate and magnesium, which cause rapid chloride ingress and accelerates the deterioration of concrete. Thus, the multiple ion attack will limit the performance of concrete and decline its service life in marine environment.

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The effect of chloride on cement mortar subjected to

2015-3-1  The increase in the dissolution of portlandite at lower temperature would result in a rapid reaction with sulfate ions to form gypsum and brucite, both of which were identified in the degradation products of mortar immersed in sulfate only and

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Effect of lead in mixing water on the properties and

2013-1-1  This paper presents the effect of lead (Pb) present in mixing water on the compressive strength, setting times, soundness and sodium sulphate attack of high strength cement mortar. Cement mortar...

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Effects Of Sulfates On Strength Of Portland Cement

2005-6-19  The results showed that the effect of magnesium sulfate was more pronounced when the concentration of the salt exceeds 6 percent. The strength of mortars decreased as the concentration of the sodium sulfate increased. INTRODUCTION The effect of impurities in mixing water on the properties of concrete is an important subject.

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Effects of mix composition and water–cement ratio on the

2007-3-1  Mortar mixtures were prepared using the cements mentioned above and the Rilem Cembureau Sand meeting the requirements of ASTM C 778. In all mortar mixtures cement:sand ratio was kept constant as 1 : 2.75 by weight.Seven mixtures were first prepared with a w/c ratio of 0.485, and flow and consistency characteristics of these mixtures were determined.

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Influence of Sulfate Ions on Chloride Attack in Concrete

2020-7-11  Increase of sulfate concentration leads to reduction of the penetration depth in silica fume/control specimens. Regarding trass, adding 25 g l −1 sulfate concentration to 165 g l −1 NaCl leads to reduction of the penetration depth. Vice versa, 55 g l −1 sulfate results in an increase in this depth.

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The effect of chloride on cement mortar subjected to

2015-3-1  The increase in the dissolution of portlandite at lower temperature would result in a rapid reaction with sulfate ions to form gypsum and brucite, both of which were identified in the degradation products of mortar immersed in sulfate only and

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(PDF) Effects of Magnesium Sulfate Attack on

2007-1-1  Sulfate attack is consider one of the major deteriorative problems oc curred when the cement based materials, such as concrete, mortars and buildings, are expose d to this envir onment. Sulphate...

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Effect of simulated different concentrations of sulfate on

2022-6-1  Mix Sodium sulfate solution and cement for prehydration for 30 s, add the accelerator for low-speed mixing for 5 s, and then quickly stir for 15 s. Then installed the mold and test the setting time with the Vicat instrument. The test was shown in Table 3. Table 3. Mixed pastes design. 2.2.2. Mortar specimen test

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EFFECT ON STRENGTH PARAMETERS OF DOUBLE MIXED

2016-4-23  Cement Mortar or Concrete deterioration due to sulphate attack is the second major durability problem, after reinforcement corrosion. This type of deterioration is noted in the structures exposed to sulphate bearing soils, ground water and waste waters.

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EFFECT ON STRENGTH PARAMETERS OF DOUBLE MIXED

EFFECT ON STRENGTH PARAMETERS OF DOUBLE MIXED SULPHATE ON FLY ASH BLENDED CEMENT MORTAR. IRJET Journal. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.

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Sodium Sulphate Effect on Cement Produced with Building

2015-5-7  Sulphate attack occurs in concrete when concrete is in contact with a source of sulphate ions, which can be groundwater, soil, or rainwater. Sulphate attack usually manifests itself by cracking and spalling of concrete accompanied by expansion and/or loss of strength.

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University of Jinan, Jinan, Shandong, China Investigation

2022-7-12  The essential hydration and hardened properties of high sulfate resistance Portland cement paste/mortar were investigated with Al 2 (SO 4 3 as admixture. Experiment results showed that that the addition of Al 2 (SO 4 3 promoted the hydration of HSRP cement pastes, and the hydration rate accelerated with the increase of the addition amount.

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Effect of Sulphate Attack on Durability of Concrete

2022-7-15  Usually the sulphate attack starts at the edges and corners, and after wards cracks and spalling of concrete start. The reaction between the hydrated products of cements and water solution of sulphate causes increase in volume of cement paste in concrete or mortar.

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Effect of Sulphates on Compressive Strength of Blended

2016-12-17  Sulphate attack is considered one of the major deteriorative problems occurred when the cement based materials, such as concrete, mortars and buildings exposed to the acidic environment. Water born...

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(PDF) Effects of Magnesium Sulfate Attack on

2007-1-1  Sulfate attack is consider one of the major deteriorative problems oc curred when the cement based materials, such as concrete, mortars and buildings, are expose d to this envir onment. Sulphate...

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Effects of foreign substances in cement mortar

2015-12-9  PDF This study examined the effects of magnesium sulfate and sodium sulfide on fresh and hardened cement mortar. Two 410 kg/m3 dosed mortars were... Find, read and cite all the research you ...

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EFFECT OF CHLORIDE IN MIX INGREDIENTS ON SULPHATE

The sulphate resistance of concretes containing various levels of chloride introduced in the mixing water was assessed by immersion in sodium sulphate and magnesium sulphate solutions. Mortar and concrete cubes were made using ordinary Portland cement (OPC) and sulphate-resisting Portland cement (SRPC) with chloride contents of 0–45%; the chloride was introduced in a

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Effect of chloride in mix ingredients on sulphate resistance

2015-5-25  A 1:3 cement/sand mix was used for the 125 mm mortar cubes. The results over 1 year for the mortar cubes showed that chloride had either a negligible or a generally beneficial effect on the resistance to sulphate attack for both OPC and SRPC.

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Sulphate Attack On Concrete And Its Prevention

2020-4-22  Fig.: Internal sulphate attack in concrete. External Sulphate Attack (ESA) on Concrete. Sulphates (expressed as SO 3) present in the ground (or sea) water or soil attack hardened, relatively permeable concrete and react

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Effect of chloride in mix ingredients on sulphate resistance

2015-5-25  A 1:3 cement/sand mix was used for the 125 mm mortar cubes. The results over 1 year for the mortar cubes showed that chloride had either a negligible or a generally beneficial effect on the resistance to sulphate attack for both OPC and SRPC.

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University of Jinan, Jinan, Shandong, China Investigation

2022-7-12  The essential hydration and hardened properties of high sulfate resistance Portland cement paste/mortar were investigated with Al 2 (SO 4 3 as admixture. Experiment results showed that that the addition of Al 2 (SO 4 3 promoted the hydration of HSRP cement pastes, and the hydration rate accelerated with the increase of the addition amount.

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Effects Of Surface And Subsurface Mixing Water Of

Distilled and municipal treated tap water were used as controls. Water samples were analysed for pH and concentrations of alkali, chloride and sulphate ions. Cement mortar was made using the sampled water vis a vis tap and distilled water and cured in accordance with KS EAS 148-3: 2000. Compressive strength was determined at 2 nd, 7 th, 28 th ...

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