Deicer-scaling resistance of phosphate cement-based binder for rapid repair of concrete

Yang, Qi; Zhang, Shuqing; Wu, Xueli

doi:10.1016/s0008-8846(01)00651-2

Cited by 167 publications

(135 citation statements)

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“…SET 45® is a phosphate cement based repair material which is typically prepared with magnesium phosphate (MgO), mono ammonium phosphate (NH4H2PO3), borax and fly ash. Information regarding presence of any air entraining agent was not provided by the manufacturer but it has been reported elsewhere by researchers that many airbubbles are generated during the casting of phosphate based cements due to the release of NH3 and H2 but the size of the bubbles is not provided (Yang et al, 2002). During the point count test of SET 45 a large amount of entrapped voids were observed (2.5%).…”

Section: Methodsmentioning

confidence: 99%

Dowel Bar Retrofit Mix Design and Specification

Deshpande¹,

Olek²

2008

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JOINT TRANSPORTATION RESEARCH PROGRAMThe Joint Transportation Research Program serves as a vehicle for INDOT collaboration with higher education institutions and industry in Indiana to facilitate innovation that results in continuous improvement in the planning, design, construchttps://engineering.purdue.edu/JTRP/index_html Supplementary NotesPrepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractThe focus of this project was on identifying critical properties that control long term performance of repair concrete, especially rapid setting materials extended using pea gravel (maximum size aggregate 9.5 mm).In the first phase of this project, four commercial rapid setting materials (CRSMs) were selected and development of mixture proportions in terms of optimum pea gravel content and water content was performed. Optimized mixtures were further evaluated at three different initial temperature conditions. The properties evaluated included workability, setting time, rate of compressive strength developed, slant shear bond strength, freeze thaw resistance, air void system characteristics of hardened concrete, drying shrinkage and cracking potential. It was observed that some of the CRSMs evaluated did not meet requirements of ASTM C 928. All, except one, CRSMs tested exhibited low resistance to freezing and thawing but all had high resistance to cracking.In the second phase of the project, rapid setting self consolidating concrete (RSSCC) was developed using ternary blend of cementitious materials, high range water reducer (HRWR) and accelerators. Slump flow, visual stability index (VSI), compressive strength at various ages and the power consumption values for the mortar mixer indicated that a five minutes mixing sequence involving a 2Step addition of HRWR produces stable RSSCC mixture. The results of various tests carried out indicate that it is possible to develop a small aggregate size based self consolidating repair concrete that achieves a compressive strength of 19 MPa at the end of 6 hrs, has good bond characteristics and excellent freezing and thawing durability (DF>90%).The sensitivity of RSSCC to aggregate characteristics and production variables was also evaluated. Specifically, the influence of aggregate gradation and aggregate moisture content using different types of mixers and re mixing after a period of rest was evaluated. It was observed that variation in aggregate moisture content and aggregate gradation resulted in noticeable changes in fresh concrete properties such as the slump flow, stability and V funnel flow values. While changes in moisture content and gradation of aggregates had an impact on the early (6 h) compressive strength, the compressive strength at the end of 24 hours was not significantly affected. Key Wordsdowel bars, rapid setting repair materials, self consolidating concrete, durability Distribution StatementNo restrictions. This document is available to the public through the National Technical Information Service, Spri...

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Section: Methodsmentioning

confidence: 99%

Dowel Bar Retrofit Mix Design and Specification

Deshpande¹,

Olek²

2008

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“…In previous studies, four major types of inorganic matrices have been explored for the development of fiber-reinforced inorganic polymer (FRIP) composites: (1) polymer-modified mortar-based matrix (usually ordinary Portland cement mortar (PMM) [4][5][6]; (2) geopolymer (GP)-based matrix [7,8]; (3) magnesium oxychloride cement (MOC)-based matrix [9]; and (4) magnesium phosphate cement (MPC)-based matrix [10,11]. Among them, magnesium phosphate cement (MPC) has a very high strength, an excellent adhesion performance with other cementitious materials and a good volume stability [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, magnesium phosphate cement (MPC) has a very high strength, an excellent adhesion performance with other cementitious materials and a good volume stability [10,11]. However, traditional MPC, which consists of magnesia and ammonium phosphates, develops strength by a violent acid-based reaction between magnesia and phosphate solution, resulting in a very fast setting of the paste.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the utilization of this cement is limited. In the past several years, MPC was only used for the rapid repair of concrete structures [11].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is thought of as a green and sustainable inorganic binder. MPC is receiving greater attention, because of its many advantages, including quick strength development, good durability and dimensional stability, good water absorption resistance and excellent adhesion properties with old concrete substrates [11,14,15]. It is a very attractive material for the repair of concrete structures, for sealing boreholes and the solidification of hazardous wastes.…”

Section: Introductionmentioning

confidence: 99%

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Study on an Improved Phosphate Cement Binder for the Development of Fiber-Reinforced Inorganic Polymer Composites

2014

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Magnesium phosphate cement (MPC) has been proven to be a very good repair material for deteriorated concrete structures. It has excellent adhesion performance, leading to high bonding strength with old concrete substrates. This paper presents an experimental study into the properties of MPC binder as the matrix of carbon fiber sheets to form fiber-reinforced inorganic polymer (FRIP) composites. The physical and mechanical performance of the fresh mixed and the hardened MPC paste, the bond strength of carbon fiber sheets in the MPC matrix, the tensile strength of the carbon FRIP composites and the microstructure of the MPC matrix and fiber-reinforced MPC composites were investigated. The test results showed that the improved MPC binder is well suited for developing FRIP composites, which can be a promising alternative to externally-bonded fiber-reinforced polymer (FRP) composites for the strengthening of concrete structures. Through the present study, an in-depth understanding of the behavior of fiber-reinforced inorganic MPC composites has been achieved.

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Materials for Making Concrete

2022

Advanced Concrete Technology

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Deicer-scaling resistance of phosphate cement-based binder for rapid repair of concrete

Cited by 167 publications

References 5 publications

Dowel Bar Retrofit Mix Design and Specification

Dowel Bar Retrofit Mix Design and Specification

Study on an Improved Phosphate Cement Binder for the Development of Fiber-Reinforced Inorganic Polymer Composites

Materials for Making Concrete

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