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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

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HR-355 The Role of Magnesium in Concrete Deterioration

2014-9-11  road deicers, has a major role in highway concrete deterioration. Consequently, magnesium deicers should be used with caution, and long ­term testing of the effects of magnesium deicers on highway concrete should be implemented to determine their effects on durability. HR-355 The Role of Magnesium in Concrete Deterioration

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THE ROLE OF MAGNESIUM IN CONCRETE DETERIORATION

2019-9-16  THE ROLE OF MAGNESIUM IN CONCRETE DETERIORATION Final Report November 1994 Iowa DOT I-IR-355 Submitted to the Project Development Division of the Iowa Department of Transportation and The Iowa Highway Research Board Robert D. Cody, Paul G. Spry, Anita M. Cody, and Guo-Liang Gan

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The role of magnesium in concrete deterioration

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

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The role of magnesium in concrete deterioration

DOI: 10.31274/RTD-180813-10415 Corpus ID: 127760914. The role of magnesium in concrete deterioration @inproceedings{Gan1996TheRO, title={The role of magnesium in concrete deterioration}, author={G. Gan}, year={1996} }

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THE ROLE OF MAGNESIUM IN CONCRETE

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. Consequently, magnesium deicers should be used with caution, and long-term testing of the effects of magnesium deicers on highway concrete should be implemented to determine their ...

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The Role of Magnesium in Concrete Deterioration - Iowa

2016-3-27  文档格式:.pdf 文档页数: 153页 文档大小: 4.99M 文档热度: 文档分类: 幼儿/小学教育 -- 教育管理 文档标签: The Role of Magnesium in Concrete Deterioration-Iowa 系统标签: iowa deterioration magnesium concrete role

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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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THE ROLE OF MAGNESIUM IN CONCRETE

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

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The role of magnesium in concrete deterioration

dc.contributor.advisor: Paul G. Spry: dc.contributor.advisor: Robert D. Cody: dc.contributor.author: Gan, Guoliang: dc.contributorpartment: Geological and ...

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The role of magnesium in concrete deterioration

DOI: 10.31274/RTD-180813-10415 Corpus ID: 127760914. The role of magnesium in concrete deterioration @inproceedings{Gan1996TheRO, title={The role of magnesium in concrete deterioration}, author={G. Gan}, year={1996} }

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The Growing Case Against Magnesium Chloride - Eco

Iowa DOT report HR-355, The Role of Magnesium in Concrete Deterioration . Peter G. Snow, FACI from Burns Concrete, Inc., Idaho Falls, Idaho wrote the following: Magnesium chloride comes into contact with the now deiced concrete surface and remains contained in the melt water, and permeates into the concrete. While deicing salts containing ...

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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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Magnesium Oxide in Portland Cement - ScienceDirect

1983-1-1  Dubuisson [26] investigated the effect of adding 20% MgO (as MgO or MgC03> to white cement (no Fe2Û3), Portland cement and Ferrari cement (excess of Fe203) compositions at 800 to 1460 C, and found that normal and stable cements containing as much as 35.7% MgO could be produced by using Ferrari cement composition.

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(PDF) The Role of Magnesium in Superalloys—A

2011-1-1  The Role of Magnesium in Superalloys—A Review 1245. reported that Mg did not aff ect the steady state creep rate. The LCF properties and crack growth rate of LCF at. 700 ˚ C were also ...

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The formation and role of ettringite in Iowa highway

2005-2-1  In the Iowa highway concrete studied, the formation of calcite in reaction zones of the cement paste locally depletes Ca (OH) 2 and thereby may facilitate ettringite dissolution. This observation may partly explain the near absence of ettringite in

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The role of solute in grain refinement of magnesium

The effect of separate solute additions of Al, Zr, Sr, Si, and Ca on grain size of Mg has been investigated. Increasing the Al content in hypoeutectic Mg-Al alloys resulted in a continuous reduction in grain size up to 5 wt pct Al, reaching a relatively constant grain size for higher Al contents (above 5 wt pct). The effect of Sr additions was investigated in both low- and high-Al

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The role of magnesium as an adjuvant during general

2006-10-16  Magnesium is the fourth most abundant cation in the body and the second most abundant intracellular cation [1, 2].It activates many of the enzyme systems involved in energy metabolism and acts as a natural calcium antagonist, regulating calcium access into the cell [].It has been suggested that magnesium has the potential to treat and prevent pain by acting as

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(PDF) The role of moisture in degrading

2016-1-29  2. Influence of moisture on degradation mechanisms. Paradoxically, whil e water is essential for the hydration of c ement and consequen t development. of strength and durability, it also plays a ...

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The role of calcium and magnesium in the concrete tubes

2007-4-15  The role of Ca 2+ and Mg 2+ ions in the cement is not understood,but recent atomic force microscopy (AFM) studies of bone suggest that Ca 2+-mediated interactions between bone mineral, collagen and phosphoproteins contribute significantly to the cohesiveness and fracture toughness of the bone structure (Fantner et al., 2005).

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A Review of Magnesium Oxide in Concrete

2005-12-1  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

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Deterioration From Magnesium Chloride Concrete

1982-11-1  M. Lea, in The Chemistry of Cement and Concrete (third edition, Chemical Publishing Company, New York, page 673) says: "Solutions of magnesium chloride of 2 percent concentration and upwards produce a gradual diminution in the strength of portland cement mortars," and "Very strong [about 30 percent] solutions destroy portland cement concrete."

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The role of magnesium in the crystallization of

1996-5-1  Morphological development of calcite crystals is related to supersaturation conditions during growth. Crystallization of calcium carbonate (calcite and aragonite) as well as Mg-calcite was studied under controlled supersaturation conditions by the counter diffusion of Ca (super 2+) and CO 3 (super 2-) ions through a porous transport medium (a column of silica gel).

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(PDF) The Role of Magnesium in Superalloys—A

2011-1-1  The Role of Magnesium in Superalloys—A Review 1245. reported that Mg did not aff ect the steady state creep rate. The LCF properties and crack growth rate of LCF at. 700 ˚ C were also ...

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The role of magnesium in clinical biochemistry: an overview

Magnesium is the second most abundant intracellular cation. It is essential for a wide variety of metabolically important reactions, in particular those involving ATP. ... The role of magnesium in clinical biochemistry: an overview Ann Clin Biochem. 1991 Jan;28 ( Pt 1):19-26. doi: 10.1177/000456329102800103. Author M F Ryan 1 Affiliation 1 ...

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Characterizing properties of magnesium oxychloride

2020-1-16  The performance of magnesium oxychloride cement concrete (MOCC) in road engineering in the arid region in northwest China was investigated over a two-year period. Two categories of MOCC pavement, light-burnt magnesia concrete road (Road-L) and dolomite concrete road (Road-D), were prepared with light-burnt magnesia and a mixture of light-burnt

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Types and Causes of Concrete Deterioration - Cement

2014-4-14  humidity of the concrete, and the pH and temperature. 3 Types and Causes of Concrete Deterioration Fig. 4. Deicing salts are a major cause of corrosion of reinforcing steel in concrete. (55807) Table 2. Maximum Chloride Ion Content of Concrete (ACI 318) Maximum Type of Member Cl-* Prestressed concrete 0.06 Reinforced concrete exposed to ...

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On the role of magnesium ions in RNA stability - Misra

2000-10-26  The overall stabilization of RNA by Mg 2+ is given by the free energy of transferring RNA from a reference univalent salt solution to a mixed salt solution. This term has favorable energetic contributions from two distinct modes of binding: diffuse binding and site binding. In diffuse binding, fully hydrated Mg ions interact with the RNA via ...

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Magnesium and anaesthesia - PubMed

Purpose: to review current knowledge concerning the use of magnesium in anesthesiology, the role of hypomagnesemia and hypermagnesemia in perioperative period, analyzing the cardiologic problems related to blood serum concentration changes of magnesium that can interesting in primis the anaesthesist in perioperative period. Methods: References were obtained from

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