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Mitigation of Internal Sulfate Attack in New and Old Concrete

Mitigation of Amde Internal Sulfate Attack in New and M. Amde and Richard A. Livingston Old Concrete immediately harden not allowing the formation of the C-S-H Abstract— The effects on delayed ettringite formation (DEF) of gel.

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Sulfate Attack - Slag Cement

Sulfate attack is a common form of concrete deterioration. It occurs when concrete comes in contact with water containing sulfates (SO 4 ). Sulfates can be found in some soils (especially when arid conditions exist), in seawater, and in wastewater treatment plants. Waterborne sulfates react with hydration products of the tri-calcium aluminate ...

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Thaumasite sulfate attack on concrete: Mechanisms ...

Dec 30, 2014  Thaumasite (C 3 S S ¯ C ¯ H 15) is a rare naturally occurring mineral comprising complex hexagonal crystal structure of sulfate salt, usually found in metamorphic rocks and limestone , .It is composed of calcium silicate, carbonate, sulfate, and water. Erlin and Stark first reported thaumasite formation (TF) in portland cement concrete in 1965. It was found in sanitary sewer pipes, portland ...

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Sulfate Attack - an overview ScienceDirect Topics

Sulfate attack is the reaction between sulfate ions in the pore solution of concrete and constituents in the concrete that result in formation of new reaction products with a relatively large molar volume. If sufficient new phases are formed, stresses can be induced in the concrete to such an extent that the concrete can undergo cracking.

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Sulfate Attack and Sulfate Content in Concrete: A ...

Jan 14, 2017  Internal sulfate attack occurs when a source of sulfate is incorporated in the concrete when mixing like excess gypsum in cement, sulfate in the

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Effects of an internal sulfate attack and an alkali ...

The alkali-aggregate reaction and the internal sulfate attack are two chemical reactions that lead to expansions in concrete structures. The former is one of the main causes of expansions in ...

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Durability Design of Segmental Linings for Intended ...

standards recommendations to mitigate sulfate attack are based on using a concrete with low w/c ratio, high compressive strength and high cement content. In addition codes require use of sulfateresisting - cements such as type II portland cement (ASTM C150, 2017) or in severe cases type V (ASTM C150, 2017) plus pozzolan or slag cement.

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Numerical simulation of fly ash concrete under sulfate attack

Jun 01, 2015  Neville described three approaches to mitigate sulfate attack, including using cement with low C 3 A content, reducing Ca(OH) 2 content in the hydrated cement paste by using cements that contain supplementary cementitious materials (SCMs), and making concrete as dense as possible to prevent the ingress of sulfate solutions. The blended cements ...

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Internal and External Effects of Sodium Sulfate on the ...

Sep 06, 2020  In coastal industrial zones with saturated loose soil, sulfate attack is an additional problem. The problem becomes more acute when using soil cement, because an undesirable sulfate content can enter the body of the element with the material used to create it. This research includes two parts. In the first part, the effects of internal and external sulfate attack are compared in simulation of ...

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Concrete Floor Covering Failures

to Sulfate Attack General Observations: • Vinyl tiles and sheet vinyl were installed on a slab-on-grade less than two years old • Localized debonding occurred within a few months • Petrographic examinations were performed on concrete cores taken from the slab. The concrete was normal. • A shrinkage compensating mortar was present above ...

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Mitigation Techniques for In-Service Structures with ...

This report (Report 4069-3) describes the development and verification of a new test method, and the application of that test method to recommendations for specific treatments to mitigate premature concrete deterioration from ASR/DEF.

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Corrosion Mitigation of Tanks - Bureau of Reclamation

CTS presentation “Internal Cathodic Protection of Tanks and Vessels” Clive Hakins. New Mg Anode Old Mg Anodes Zinc Anode. Impressed Current CP System. ... a copper-copper sulfate reference electrode. Inspection Frequency Based on NACE standards RP0196, SP0388, RP0285 Standard/

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Pyrrhotite Foundation Damage Due to Composition or ...

Pyrrhotite is a highly reactive iron-sulfide mineral that can initiate internal sulfate attack in concrete structures, because it serves as a source of sulfate ions for secondary minerals. Associated increases in mineral volume can lead to spalling, cracking and a loss of structural integrity.

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muthu priya - Academia

Mitigation of Internal Sulfate Attack in New and Old Concrete more. by muthu priya. Research Interests: Civil Engineering. Download (.doc)-by 30-day views-total views-followers.

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Concrete degradation - Wikipedia

Concrete degradation may have various causes.Concrete can be damaged by fire, aggregate expansion, sea water effects, bacterial corrosion, calcium leaching, physical damage and chemical damage (from carbonatation, chlorides, sulfates and non-distilled water).This process adversely affects concrete exposed to these damaging stimuli.

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Visual Inspection of Concrete - InterNACHI®

Sulfate Attack. There are two types of sulfate attack: internal and external. External attack is more common. External Sulfate Attack. External sulfate attack occurs when water containing dissolved sulfates is absorbed into porous concrete. A chemical reaction takes place that can vary in severity and may appear as: extensive cracking; expansion;

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Download [PDF] Sulfate Attack On Concrete Free – Usakochan PDF

Annotation copyrighted by Book News, Inc., Portland, OR. Author: Jacques Marchand. Publisher: Wiley-American Ceramic Society ISBN: UOM:39015050696957 Category: Science Page: 371 View: 184 Read Now » The 18 papers grapple with new problems and old ones that remain unresolved concerning sulfate attack on concrete, not considered one of the most prevalent mechanisms of concrete

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Alkali-silica reaction in concrete - Understanding Cement

This easy-to-read and concise book contains much more detail on concrete chemistry and deleterious processes in concrete compared with the website. For example, it has about two-and-a-half times as much on ASR, one-and-a-half times as much on sulfate attack and nearly three times as

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Sulfate damage to concrete floors on sulfate-bearing hardcore

4 Sulfate damage to concrete floors on sulfate-bearing hardcore Outline of the guidance document Sections 1 to 5 provide information on the mechanism of sulfate attack and where it is most likely to be found. Key points made are: • For deleterious sulfate attack to occur in a ground floor slab, the concrete

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SPR-575: Concrete Aggregate Durability Study

approach to ASR and sulfate attack mitigation to ensure success in the future: •ADOT should review its supplementary cementitious material (SCM) specifications to ensure that those materials being used in its concrete have the desired effect of mitigating ASR and sulfate attack.

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Internal attack by sulphates in cement pastes and mortars ...

Jul 15, 2017  Oliveira I, Cavalaro SHP, Aguado A (2013) New kinetic model to quantify the internal sulfate attack in concrete. Cem Concr Res 43:95–104. Article Google Scholar 14. Hasparyk NP, Muniz FC, Andrade MAS, Gomides MJ, Bittencourt RM, Carasek H (2003) The deterioration of concrete structures containing aggregates with sulphides.

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Degradation of concrete structures from influence of ...

Jan 06, 2020  The most effective ways to prevent sulfate attack in new structures are using high quality concrete (with low water-to-cement ratio and/or SCMs) and/or Type II or V cements. ASTM C1012 is the standard code to evaluate the expansion of mortar specimens exposed to sulfate solutions.

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The occurrence of thaumasite in newly built concrete ...

Mar 17, 2021  In the case of an internal sulfate attack (ISA), the concrete may contain within it the seeds of its own destruction. It is the case when for example, the concrete is made with potentially alkali reactive aggregates and/or contains sulfide bearing aggregates, as recently reported in literature [19, 26, 31, 33,34,35].Concrete containing limestone and sulfide bearing aggregates suffers from ...

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Alkali-silica reaction in concrete - Understanding Cement

This easy-to-read and concise book contains much more detail on concrete chemistry and deleterious processes in concrete compared with the website. For example, it has about two-and-a-half times as much on ASR, one-and-a-half times as much on sulfate attack and nearly three times as

Get Price

Pyrrhotite Foundation Damage Due to Composition or ...

Pyrrhotite is a highly reactive iron-sulfide mineral that can initiate internal sulfate attack in concrete structures, because it serves as a source of sulfate ions for secondary minerals. Associated increases in mineral volume can lead to spalling, cracking and a loss of structural integrity.

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Concrete Industry Gains Legal Victory in Sulfate Issue : CEG

“In that concrete, we positively confirmed that sulfate attack was occurring and that the concrete in the crawl space of the home was weakened by it,” he said. But, Hichborn noted, the house ...

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Grouting to Prevent Sulfate Corrosion on Coal Mine Shaft

Jul 21, 2021  Although concrete technologists attribute concrete damage mainly to salt crystallization or physical sulfate attack, the influence of chemical sulfate attack

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Types and Causes of Concrete Deterioration

internal stress within the concrete that may be sufficient to cause cracking and spalling of the concrete cover. Corrosion of embedded metals in concrete can be greatly re-duced by placing crack-free concrete with low permeability and sufficient concrete cover. Table 1 shows the concrete cover re-

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PRIMR - Wiss, Janney, Elstner Associates, Inc.

the cementitious matrix, causing internal cracking and, ultimately, disintegration of the concrete. Removal and replacement of affected concrete is the only effective method for addressing concrete suffering from severe sulfate attack. Avoidance Most quarries that produce aggregate fill materials are cognizant of formations that FIGURE 4.

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Visual Inspection of Concrete - InterNACHI®

Sulfate Attack. There are two types of sulfate attack: internal and external. External attack is more common. External Sulfate Attack. External sulfate attack occurs when water containing dissolved sulfates is absorbed into porous concrete. A chemical reaction takes place that can vary in severity and may appear as: extensive cracking; expansion;

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Thaumasite Expert Group Report: Review after three years ...

• 6 new cases associated with sulfate-bearing brickwork • 2 cases of internal sand/cement render contaminated with gypsum • 1 set of harbour steps in S. Wales exposed to seawater • 2 new cases of heave in ground floor slabs resting on sulfate-bearing fill • 1 case in a concrete kerb forming part of a drainage adit in S. Wales

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APPLICATION OF PETROGRAPHY IN THE CONCRETE REPAIR

mitigate or eliminate the distress. Petrography also evaluates the performance of a repair ... new look to this old science. RÉSUMÉ: APPLICATION DE LA PÉTROGRAPHIE DANS L'INDUSTRIE DE ... and internal and/or external sulfate attacks in concrete Cracks induced by early thermal contraction, seasonal/daily temperature

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