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the role of magnesium in concrete deterioration hr355

the role of magnesium in concrete deterioration hr355

The Role of Magnesium in Concrete Deterioration - Iowa

2014-9-19  The Role of Magnesium in Concrete Deterioration Robert D. Cody Paul G. Spry Anita M. Cody Guo-Liang Gan Concretes with service lives ofless than 15 years and those with lives greater than 40 years were studied with petrographic microscope, scanning electron microscope, and

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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, HR-355 ...

In the main report concerning the role that magnesium may have in highway concrete aggregate, over 20,000 electron microprobe data were obtained, primarily from automated scans, or traverses, across dolomite aggregate grains and the adjacent cement paste. Representative traverses were shown in figures and averages of the data were presented in Table II.

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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, HR-355 ...

The Role of Magnesium in Concrete Deterioration, HR-355, Appendix, 1994 . By . Download PDF (2 MB) Abstract. In the main report concerning the role that magnesium may have in highway\ud concrete aggregate, over 20,000 electron microprobe data were obtained, primarily from\ud automated scans, or traverses, across dolomite aggregate grains and ...

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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.

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 - CORE

The role of magnesium in concrete deterioration - CORE Reader

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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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The role of magnesium in concrete deterioration - CORE

The role of magnesium in concrete deterioration - CORE Reader

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Scaling on Concrete Driveways - Donan - Forensic ...

Several studies have reported that exposure of concrete surfaces to magnesium (Mg) compounds (commonly found in some deicers) can contribute to deterioration of the concrete structure.(1,2) A two-part study in the publication from Concrete International (CI) reported that common deicers such as NaCl and CaCl should not cause scaling in good ...

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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: a ...

2020-10-13  Iowa Highway Concrete Deterioration 1 The Role of Deicer in Concrete Deterioration 2 Calcium Magnesium Acetate (CMA) as an Alternative Deicer 3 Effect of Crystallization Inhibitors on the Formation of Secondary Mineral Growth in Concrete. 3 RESEARCH OBJECTIVES 5 PART L EXPANSIVE MINERALS FEATURES OF IOWA HIGHWAY CONCRETES 7 INTRODUCTION 8

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"Expansive mineral growth and concrete deterioration: a ...

2015-3-9  In order to evaluate the role of newly-formed minerals in premature deterioration of highway concrete, a three-phase study was undertaken. In the first phase, petrographic and SEM/EDAX analyses were performed to determine chemical and mineralogical changes in the aggregate and cement paste of samples taken from Iowa highways that showed premature deterioration.

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Durability of concrete materials in high-magnesium brine ...

1994-3-1  Cement pastes and mortars representing 11 combinations of candidate concrete materials were cast in the laboratory and monitored for susceptibility to chemical deterioration in high-magnesium brine. Mixtures were selected to include materials included in the current leading candidate concrete for seals at the Waste Isolation Pilot Plant (WIPP).

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Concrete Deterioration - an overview ScienceDirect Topics

M.A. Murray, in Failure, Distress and Repair of Concrete Structures, 2009 11.7 Recommendations. Patching of localized areas of concrete deterioration has proven to be an effective means to increase the life expectancy of a structural element. To maximize the benefits of repairs that incorporate patching that is the result of corrosion, the reinforcing steel that has been encountered must have ...

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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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The effect of chlorides on concrete in hot and arid ...

1974-5-1  CEMENT and CONCRETE RESEARCH. Vol. 4, pp. 405-416, 1974. Pergamon Press, Inc THE EFFECT OF CHLORIDES ON CONCRETE IN HOT AND ARID REGIONS M. Ben-Yair The Standards Institution of Israel Ramat Aviv, Tel Aviv, Israel (ConTnunicated by G. M. Idorn) (Received Feb. 22, 1974) ABSTRACT The influence of chlorides on cement and concrete is discussed.

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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: a ...

2020-10-13  Iowa Highway Concrete Deterioration 1 The Role of Deicer in Concrete Deterioration 2 Calcium Magnesium Acetate (CMA) as an Alternative Deicer 3 Effect of Crystallization Inhibitors on the Formation of Secondary Mineral Growth in Concrete. 3 RESEARCH OBJECTIVES 5 PART L EXPANSIVE MINERALS FEATURES OF IOWA HIGHWAY CONCRETES 7 INTRODUCTION 8

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Durability of concrete materials in high-magnesium brine ...

1994-3-1  Cement pastes and mortars representing 11 combinations of candidate concrete materials were cast in the laboratory and monitored for susceptibility to chemical deterioration in high-magnesium brine. Mixtures were selected to include materials included in the current leading candidate concrete for seals at the Waste Isolation Pilot Plant (WIPP).

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Expansive Mineral Growth and Concrete Deterioration, HR ...

A significant question is: What role does newly-formed expansive mineral growth play in the premature deterioration of concrete? These minerals (ettringite and brucite) are formed in cement paste as a result of chemical reactions involving cement and coarse/fine aggregate. Petrographic observations and SEM/EDAX analysis were conducted in order to determine chemical and mineralogical changes in ...

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An atomic force microscopy study of calcite dissolution in ...

2009-6-1  1.. IntroductionMineral dissolution plays a central role in a wide range of natural and engineering processes including weathering of minerals and rocks (White and Brantley, 1995, Smith et al., 2000), the deterioration of concrete and building stone (Kanellopoulou and Koutsoukos, 2003), possible mobilization of nuclear wastes (El-Korashy, 2003) and heavy metal release in natural and

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Strength Deterioration of Concrete in Sulfate Environment ...

2015-6-22  Sulfate corrosion is one of the most important factors responsible for the performance degradation of concrete materials. In this paper, an accelerated corrosion by a sulfate solution in a dry-wet cycle was introduced to simulate the external sulfate corrosion environment. The deterioration trend of concrete strength and development law of sulfate-induced concrete corrosion depth under sulfate ...

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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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Algae and Accelerating Biodeterioration of Reinforced

2017-3-24  398 Reza Javaherdashti,Hamid Nikraz,Michael Borowitzka,Navid Moheimani and Monita Olivia Figure 3: When algae are developed on concrete structures, they start to absorb chemicals such as calcium, silica and magnesium (Top). These chemicals will be taken out of the cement paste where small

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The role of carbonation in the occurrence of MgSO4 ...

2018-12-20  MgSO 4 crystallization distress on concrete combining the carbonation is confirmed.. Concrete carbonation plays a detrimental role in the physical sulfate attack on Portland cement concrete. • The factors accelerating the concrete carbonation, such as the large W/C ratio and the cement replacement by mineral admixtures, can promote the occurrence of physical sulfate attack on concrete.

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The Role of Microorganisms in the Destruction of Concrete ...

2021-1-4  The role of microorganisms in destructive processes occurring in concrete and reinforced concrete structures is considered. The mechanisms of microbiological effects on concrete surfaces and in the formation of microbial biofilms, are described. The main groups of corrosive microorganisms — in particular sulfur-oxidizing and sulfate-reducing microorganisms—are characterized.

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