THE ROLE OF MAGNESIUM IN CONCRETE DETERIORATION FINAL

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The Role of Magnesium in Concrete Deterioration - Iowa

2014-9-19  THE ROLE OF MAGNESIUM IN CONCRETE DETERIORATION Final Report November 1994 Iowa DOT HR-355 Submitted to the Project Development Division of the Iowa Depar1ment of Transportation and The Iowa Highway Research Board Robert D. Cody, Paul G. Spry, Anita M. Cody, and Guo-Liang Gan Department of Geological and Atmospheric Sciences Iowa State University

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THE ROLE OF MAGNESIUM IN CONCRETE DETERIORATION. FINAL

THE ROLE OF MAGNESIUM IN CONCRETE DETERIORATION. FINAL REPORT. Concretes with service lives of less than 15 years and those with lives greater than 40 years were studied with petrographic microscope, scanning electron microscope, and electron microprobe to determine why these two groups of concrete exhibit such different degrees of durability under highway conditions.

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The Role of Magnesium in Concrete Deterioration, HR-355 ...

According to this model, magnesium from any source, either from reacting dolomite or from magnesium road deicers, has a major role in highway concrete deterioration.

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The role of magnesium in concrete deterioration

2020-10-13  calcium and reduced magnesium (Poole Sotiropoulos, 1978, 1980; Poole, 1981). The Role of Magnesium, Calcium and Sodium in Concrete Deterioration Another potential factor is the deicers applied to reduced hazards of winter snow and ice. Studies show that sodium and calcium chloride deicers produce corrosion of aggregate (Dubberke Marks, 1985)

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"The role of magnesium in concrete deterioration " by ...

This dissertation has been written in two parts: the chemical characteristics of Iowa highway concrete containing coarse dolomite aggregate, and an experimental study of deterioration of Iowa highway concrete;Two groups of Iowa highway concretes studied here can be differentiated: durable concretes with extended service lives of >40 years and non-durable concretes with short service lives of 8 ...

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The Role of Magnesium in Concrete Deterioration, HR-355 ...

The Role of Magnesium in Concrete Deterioration, HR-355, 1994 . By . Get PDF (5 MB) Abstract. Concretes with service lives of less than 15 years and those with lives greater than 40 years were studied with petrographic microscope, scanning electron microscope, and electron microprobe to determine why these two groups of concrete exhibit such ...

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The role of magnesium in concrete deterioration - CORE

The role of magnesium in concrete deterioration - CORE Reader

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Role of ITZ in the Degradation Process of Blended Cement ...

The performance of concrete exposed to magnesium sulfate highly depended on the aggregate and the composition of raw materials. There was a trend toward more serious deterioration with increasing ITZ in the reference and limestone filler blended group after 12 months of exposure.

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The formation and role of ettringite in Iowa highway ...

2005-2-1  In the second phase, concrete deterioration was produced experimentally by immersing Iowa highway concrete samples in a sodium sulfate solution to further explore the role of ettringite in cracking. In addition, as part of the second phase, a study of the effects of chemical environment on ettringite crystallization was performed.

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Formation of magnesium silicate hydrate (M-S-H) cement ...

2014-11-1  Magnesium silicate hydrate (M-S-H) gel is formed by the reaction of brucite with amorphous silica during sulphate attack in concrete and M-S-H is therefore regarded as having limited cementing properties. The aim of this work was to form M-S-H pastes, characterise the hydration reactions and assess the resulting properties.

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Concrete Deterioration by Deicing Salts: An Experimental ...

Concrete Deterioration by Deicing Salts: An Experimental Study. ... The major cause of deterioration by magnesium chloride was the formation of noncohesive magnesium silicate hydrates, ... The Role of Magnesium in Concrete Deterioration. Iowa Department of Transportation Final Report, HR-355, 1994.

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The Growing Case Against Magnesium Chloride – Eco

2021-8-11  Iowa DOT final report HR-384, Concrete Deterioration and Expansive mineral Growth . The Iowa DOT concluded the following in its final report HR-355: According to this model, magnesium from any source, either from reacting dolomite or from magnesium road deicers, has a major role in highway concrete deterioration.

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EXPANSIVE MINERAL GROWTH AND CONCRETE DETERIORATION

Mechanisms involved in deterioration were investigated. A second objective was to investigate whether deicer solutions exacerbate the formation of expansive minerals and concrete deterioration. Magnesium in deicer solutions causes the most severe paste deterioration by forming non-cementitious magnesium silicate hydrate and brucite.

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A Review of Magnesium Oxide in Concrete - Premier

2015-2-16  Magnesium oxide-based shrinkage-compensating concrete (MgO concrete) is concrete with an additive of lightly burnt MgO powder. When MgO hydration takes place, the final product is magnesium hydroxide, Mg(OH) 2. Because Mg(OH) 2 has a larger volume than its constituents, MgO concrete is expansive. Concrete made with more typical expansive

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Role of ITZ in the Degradation Process of Blended Cement ...

The performance of concrete exposed to magnesium sulfate highly depended on the aggregate and the composition of raw materials. There was a trend toward more serious deterioration with increasing ITZ in the reference and limestone filler blended group after 12 months of exposure.

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Effects of Various Deicing Chemicals on Pavement Concrete ...

emphasized the role that the cation Mg 2+ has in concrete deterio- ... The Role of Magnesium in Concrete Deterioration. Final Report HR-355, Iowa Department of Transportation, 1994. Advertisement.

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Investigation of Concrete Deterioration Due toSulfate ...

The extent of deterioration varies from negligible to very severe depending on the type of exposure and the concentration of sulfates and chlorides, as well as the quality of concrete. Deterioration of concrete is mainly due to aggressive action of magnesium sulfates, mitigated by chloride ions, and the decomposing effect of calcium sulfates ...

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Magnesium Sulphate - an overview ScienceDirect Topics

This hydrated magnesium silicate appears to have no binding power, in contrast to silica gel, and its formation therefore represents a final stage in the deterioration of concrete attacked by magnesium sulfate solutions, although in practice it may only be reached after long periods.

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Formation of magnesium silicate hydrate (M-S-H) cement ...

2014-11-1  1. Introduction. It is well known that magnesium-silicate-hydrate (M-S-H) gels form as a result of sulphate attack of concrete in the presence of magnesium ions .M-S-H is present during the later stages of sulphate attack and hence M-S-H gels are generally believed to be of limited strength , .As a result, M-S-H gel has received little attention as a potential cementing phase.

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Types and Causes of Concrete Deterioration

2014-4-14  Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a combination of factors. The following summary discusses potential causes of concrete deterioration and the factors that influence them. CORROSION OF EMBEDDED METALS Fig. 1. Corrosion of reinforcing steel is the most common cause of concrete ...

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EXPANSIVE MINERAL GROWTH AND CONCRETE DETERIORATION

Mechanisms involved in deterioration were investigated. A second objective was to investigate whether deicer solutions exacerbate the formation of expansive minerals and concrete deterioration. Magnesium in deicer solutions causes the most severe paste deterioration by forming non-cementitious magnesium silicate hydrate and brucite.

Get price

Investigation of Concrete Deterioration Due toSulfate ...

The extent of deterioration varies from negligible to very severe depending on the type of exposure and the concentration of sulfates and chlorides, as well as the quality of concrete. Deterioration of concrete is mainly due to aggressive action of magnesium sulfates, mitigated by chloride ions, and the decomposing effect of calcium sulfates ...

Get price

Experimental Studies on Concrete with Rice Husk Ash as a ...

2015-1-23  Experimental Studies on Concrete with Rice Husk Ash as a Partial Replacement of Cement Using Magnesium Sulphate Solution (IJIRST/ Volume 1 / Issue 7 / 063) ... The role of Sulphate ions in causing deterioration of concrete has been investigated ... deterioration in Magnesium Sulphate exposure in compared to plain cement mixes. The Magnesium ...

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Role of ITZ in the Degradation Process of Blended Cement ...

The performance of concrete exposed to magnesium sulfate highly depended on the aggregate and the composition of raw materials. There was a trend toward more serious deterioration with increasing ITZ in the reference and limestone filler blended group after 12 months of exposure.

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Assessment of deterioration in RHA-concrete due to ...

2010-12-16  The assessment of magnesium sulphate attack on concretes containing rice husk ash (RHA, 20wt% of the cementitious materials) with various average particle sizes was investigated. The total cementitious materials were 390 kg and the water-to-binder ratio (W/B) was 0.53 for all mixtures. Specimens were initially cured in water for 7 d and then immersed in the 3wt% magnesium sulphate

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The Growing Case Against Magnesium Chloride Ossian Inc.

2021-7-28  Magnesium Chloride is a popular and widely used ice melter throughout the United States. Unfortunately a growing body of scientific evidence as to its damaging impact on concrete have resulted in many states baring its use on their roads. For this reason we strongly discourage use of Mag for sidewalk and parking lots.

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Sulfate-induced degradation of cast-in-situ concrete ...

In this paper, the results of laboratory tests performed to investigate the effects of magnesium on concrete deterioration and sulfate diffusion in cast-in-situ concrete samples are reported.

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Effects of Deicers on Concrete Deterioration

2008-11-1  The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete

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Types and Causes of Concrete Deterioration

2014-4-14  Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a combination of factors. The following summary discusses potential causes of concrete deterioration and the factors that influence them. CORROSION OF EMBEDDED METALS Fig. 1. Corrosion of reinforcing steel is the most common cause of concrete ...

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Deterioration of modern concrete structures and asphalt ...

2021-5-13  In concrete structures (concrete), damage from cracks, deterioration, amorphization, and delamination occur in some structures, causing disaggregation (concrete changed to very fine particles) and hollowing out of the concrete. In concrete pavements, damage from large amounts of pop-out of aggregate occurs from the surface of the concrete pavement 4–5 hours after spraying of snow melting ...

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