-
Kizdar net |
Kizdar net |
Кыздар Нет
- See all on Wikipedia
Sulfate attack in concrete and mortar - Wikipedia
This is the more common type and typically occurs where groundwater containing dissolved sulfate are in contact with concrete. Sulfate ions diffusing into concrete react with portlandite (CH) to form gypsum: When the concentration of sulfate ions decreases, ettringite breaks down into monosulfate aluminates … See more
Cement hydration and strength development mainly depend on two silicate phases: tricalcium silicate (C3S) (alite), and dicalcium silicate (C2S) (belite). Upon hydration, the main reaction products are See more
Sulfate attacks are identified through a remedial survey but they can often be overlooked when undertaking a damp survey as they can be considered as a structural rather than a dampness issue but moisture is required to promote the reaction. See more
Sulfur has long been known to contribute to damage. This is true for many materials such as metal corrosion, or concrete degradation. In King Lear, Shakespeare says: See more
If gypsum is present in excess in concrete, it reacts with the monosulfate aluminates to form ettringite:
A fairly well-defined reaction front can often be observed in See more• Oxidation of pyrite in clay formations in contact with concrete – this produces sulfuric acid which reacts with concrete.
• Bacterial activity in sewers – anaerobic sulfate reduction at … See moreThe remedial action depends on the severity of the attack and on the risk related to its evolution.
If repairs are … See more• Taylor, Harry F. W. (1997). Cement Chemistry. Thomas Telford. ISBN 978-0-7277-2592-9.
• Peter … See moreWikipedia text under CC-BY-SA license Sulphate Attack on Concrete – Process and Control of …
The compounds responsible for sulphate attack on concrete are water-soluble sulphate-containing salts, such as alkali-earth (calcium, magnesium) and …
- Estimated Reading Time: 3 mins
Mechanism and Performance Control Methods of …
Santhanam et al. conducted experimental investigations into the effects of sulfate attack on cement mortar across four distinct temperature settings. The results demonstrated that the volumetric expansion of mortar subjected to sulfate …
Sulfate Attack - an overview | ScienceDirect Topics
Sulfate attack of concrete is a complex process, which includes physical salt attack due to salt crystallization and chemical sulfate attack by sulfates from soil, groundwater, or seawater. …
Rapid Assessment of Sulfate Resistance in Mortar and Concrete
Extensive research has been conducted on the sulfate attack of concrete structures; however, the need to adopt the use of more sustainable materials is driving a need for a quicker test method …
Sulfate attack in concrete and mortar - Understanding …
Sulfate attack in concrete and mortar. Sulfate attack can be 'external' or 'internal'. External: due to penetration of sulfates in solution, in groundwater for example, into the concrete from outside. Internal: due to a soluble source being …
Precautions against sulfate attack - American Concrete Institute
What are the precautions against sulfate attack? A. Sulfate attack is either a chemical or physical reaction, or both, between sulfates—usually in soil or ground water and concrete or mortar. …
Internal Sulphate Attack in Masonry Mortars with Thaumasite …
Aug 18, 2022 · The results show that aggregates are contaminated with gypsum, which is the source of the sulphates for the internal attack. It seems that thaumasite is formed through an …
(PDF) Sulphate attack - ResearchGate
Apr 1, 2007 · The chapter Reviews the Classic form of sulphate attack, the thaumasite form of sulphate attack (TSA) and delayed ettringite formation (DEF). The focus is on self-compacting Concretes (SCC)...
Review of Thaumasite Sulfate Attack on Cement Mortar and …
Nov 15, 2012 · Thaumasite sulfate attack (TSA) is one durability consideration. This paper reviews the features of TSA, factors affecting TSA, thaumasite formation mechanisms, and prevention …
Sulphate attack in Concrete, Its Effects, Causes and …
Jul 17, 2016 · Sulphate attack is a chemical break down mechanism where suphate ion attacks on components of cement paste. Sodium Sulphate attacks calcium hydroxide and forms gypsum that becomes more than doubles the …
An Accelerated Test Method to Evaluate Cementitious Mixtures …
Mar 4, 2019 · Soil or water containing sufficient levels of sulfates can penetrate and chemically react with the hydrated cement compounds, leading to volumetric expansion, and in severe …
Effect of Sulphate Attack on Durability of Concrete | Concrete …
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 attack | PPT - SlideShare
Jul 25, 2011 · Sulphate attack occurs most commonly in mortar, concrete foundations and floors, rising walls, flue liners, and chimneys. It is caused by soluble sulphate salts in some clay …
What is sulfate attack? - Beton Consulting Engineers
Jun 7, 2021 · In the field, sulfate attack manifests itself in loss of strength, expansion, spalling of surface layers, and ultimately disintegration. Sulfates don’t exist on their own. Depending on …
What is Sulfate Attack on Concrete? - Çimsa
There are 3 fundamental reasons for the reaction known as sulfate attack or sulfate effect that results in harmful expansion in harden concrete: 1. C 3 A phase in cement, 2. Groundwater or …
Mortar and concrete made with Portland or Portland-based cements are well known to be vulnerable to attack by water-borne sulfate. The rate of attack is generally attributed to the …
Is Your Concrete Safe from Sulphate Attacks? - MARKHAM
May 2, 2023 · Mechanics of sulphate attacks are complex, but suffice it to say, they’re a real threat to concrete structures exposed to sulfate-containing water and the damages can be …
Evolution of Damage Due to Sulphate Attack in Cement Mortar …
Sep 18, 2019 · Currently, many researchers have investigated the sulphate attack to mortars and concretes, but none has reported the sulphate attack in ground coal bottom ash mortars or …
Prevention and Treatment of Sulphate Attack On Brickwork
Symptoms include cracking, crumbling, and spalling of bricks and mortar. Sulphate attack can be prevented through good design and workmanship, using mortar resistant to water penetration, …
Synergistic Utilization of Al-rich and Carbonate-rich Mineral ...
5 days ago · However, cement mortar with carbonated steel slag has a higher compressive strength than cement mortar containing uncarbonated steel slag [85], [94]. ... Therefore, the …
Durability prediction of geopolymer mortar reinforced with ...
In this study, polyvinyl alcohol (PVA) fibers and nanoparticles were incorporated to enhance the durability of geopolymer mortar (GM) with metakaolin (MK) and fly ash (FA). The dosage of …
(PDF) Enhancing steel slag cement mortar performance under …
3 days ago · with steel slag powder. e mortar mixes were produced using a water-to-binder ra tio of 0.50 and placed in standard test cubic molds. e specimens were cured in a chamber main …
Related searches for sulphate attack on mortar
Skip to content
