• Polymer Modified Concrete Resurfacer
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• Handbook Of Polymer Modified Concrete And Mortar Pdf Free

Read Free Ebook Now Handbook of Polymer-Modified Concrete and Mortars: Properties and Process. Extra resources for Handbook of polymer-modified concrete and mortars: properties and process technology. The required workability of fresh latex-modified concrete and the required primary and secondary performance of hardened latex-modified concrete are determined corresponding to its applications.

Description

Mortar and concrete made with portland cement has been a popular construction material in the world for the past 170 years or more. However, cement mortar and concrete have some disadvantages such as delayed hardening, low tensile strength, large drying shrinkage and low chemical resistance. To reduce these disadvantages, polymers have been utilized as an additive.

Polymer-modified or polymer cement mortar (PCM) and concrete (PCC) are the materials which are made by partially replacing the cement hydrate binders of conventional cement mortar or concrete, with polymers. This book deals with the principles of polymer modification for cement composites, the process technology, properties and applications of the polymer-modified mortar and concrete, and special polymer-modified systems such as M DF cement, antiwashout underwater concrete, polymer-ferrocement, and artificial I wood.

The polymeric admixtures or cement modifiers include latexes or emulsions, redispersible polymer powders, water-soluble polymers, liquid resins and monomers.

This book describes the current knowledge and information of polymer-modified mortars and concretes, and discusses or reviews the following items in detail:

1. Principles of polymer modification for cement composites.
2. Process technology of polymer-modified mortars and concretes.
3. Properties of polymer-modified mortars and concretes.
4. Applications of polymer-modified mortars and concretes.
5. Special polymer-modified systems such as MDF cements, antiwashout underwater concretes, polymer-ferrocements, and artificial woods.

Materials scientists, building and civil engineers, architects, chemical engineers and students in these areas

Table of Contents

1. Introduction 1.0 Historical Background 2.0 Standards, Standard Specifications, and Guides
2. Principles of Polymer Modification for Cement Composites 1.0 Introduction 2.0 Principles of Latex Modification 3.0 Modification with Redispersible Polymer Powders 4.0 Modification with Water-Soluble Polymers 5.0 Modification with Liquid Resins 6.0 Modification with Monomers
3. Process Technology of Latex-Modified Systems 1.0 Materials 2.0 Mix Proportioning 3.0 Mixing 4.0 Placing and Curing
4. Properties of Latex-Modified Systems 1.0 Properties of Fresh Mortar and Concrete 2.0 Properties of Hardened Mortar and Concrete
5. Fabrication and Properties of Redispersible Polymer-Powder-Modified Systems 1.0 Fabrication 2.0 Properties
6. Fabrication and Properties of Water-Soluble Polymer-Modified Systems 1.0 Fabrication 2.0 Properties
7. Fabrication and Properties of Liquid Resin and Monomer-Modified Systems 1.0 Epoxy-Modified Systems 2.0 Polyester-Modified Systems 3.0 Polyurethane-Modified Systems 4.0 Other Resin-Modified Systems 5.0 Monomer-Modified Systems
8. Special Polymer-Modified Systems 1.0 Hydrated-Type Flexible Waterproofing Materials 2.0 Ultrarapid-Hardening Polymer-Modified Concretes 3.0 Polymer-Ferrocements 4.0 MDF Cements 5.0 Antiwashout Underwater Concretes 6.0 Artificial Wood 7.0 Composite Cement Modifiers
9. Applications Index

Reviews

'...handbook will be of use to materials scientists, building and civil engineers, architects, chemical engineers and students in these areas.' - Polymer News

Polymer Modified Concrete Resurfacer

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Combustion and Mechanical Properties of Polymer-Modified Cement Mortar at High Temperature

¹Hazard Mitigation Evaluation Technology Center, Korea Conformity Laboratories, Cheongju 28115, Republic of Korea
²Department of Building System Engineering, Kangwon National University, Samcheok 25913, Republic of Korea

Correspondence should be addressed to ; rk.ca.nowgnak@krapjw

Handbook Of Polymer Modified Concrete And Mortar Pdf Pdf

Received 22 March 2017; Accepted 7 June 2017; Published 11 July 2017

Academic Editor: Michele Zappalorto

Copyright © 2017 Hyung-Jun Kim and Won-Jun Park. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Although polymer-modified cement mortar (PCM) has been extensively used as finishing and repairing material, it is necessary to understand its combustion properties and mechanical properties at high temperature. This study evaluated the combustion characteristics with varying experimental parameters such as polymer type, unit polymer content, polymer-cement ratio, and thickness of the specimen. This study also evaluated the compressive strength and elastic modulus of PCMs with focus on the effects of the type of polymer, unit polymer content, and polymer-cement ratio. As a result, the incombustibility of the PCM was in the following order: SBR < VVA < EVA. After heating end, the mass loss rate of the PCM was less than 30%, regardless of the polymer type, unit polymer content, and W/C. In heat release rate test, the higher the unit polymer content, the greater the total heat release, regardless of the difference in W/C. The PAE series showed excellent fire resistance in the temperature range of 200~400°C. PCMs with a unit polymer content of 5%, modified with EVA and PAE, showed outstanding compressive strength at 200~400°C. At elevated temperature, the modulus of elasticity of PCM declined with an increase in the unit polymer content, regardless of the polymer type.

1. Introduction

Repair and strengthening are necessary to extend the service life of existing buildings. Polymer-modified cement mortar (PCM) has been extensively used for repairing works because PCM has superior performances as a high-performance material, particularly for finishing and repairing works in concrete buildings [1–4]. PCMs are also commonly used in civil infrastructures, bridges, external wall insulation mortar, self–leveling mortar, and concrete repaired fields due to their excellent strength, environmental protection, adhesion, waterproofing, resistance to chemical attack, and workability [5–8]. Additionally, PCM has outstanding performance compared to ordinary mortar as concrete repair materials in case of applying them to deteriorated reinforced concrete structure [9–12]. However, it is very difficult to choose the appropriate patch repair materials due to insufficient experimental data on the fire resistance and safety of the PCM [12, 13]. With the increasingly widespread use of PCM in buildings, concern has developed regarding the behavior of this material in the case of fire because PCM is generally combustible and susceptible to deterioration of the mechanical and bonding properties at elevated temperature [12–14]. Therefore, it is necessary to clarify its behavior at high temperature upon exposure to fire; however, insufficient data are available in this regard [14–16]. To meet fire endurance requirements, the performance of these materials at elevated temperature must be understood based on assessment to the mechanical properties [14]. However, when repair is required, it is very difficult to select the appropriate patch repair materials because of insufficient experimental data on the fire resistance and safety of PCM [7–9].

As PCM contains an organic polymer, it is necessary to understand its combustion properties and mechanical properties at high temperature such as those encountered during fires, for which there is not sufficient available data. Conventional technologies and existing studies are mainly focusing on the mechanical properties such as adhesion and compressive strength, mix proportions of PCM, and durability for use before repairing and after repairing using PCMs in concrete structure.

This study evaluated the combustion characteristics of PCM by means of cone calorimeter, noncombustibility, and flammability tests with varying experimental parameters such as polymer type, unit polymer content, polymer-cement ratio, and thickness of the specimen. The effects of polymer type, unit polymer content, and water-cement ratio (W/C) were evaluated from the results of the above-mentioned tests. In addition, ignition and heat release rate tests were performed for various PCM thicknesses. Additionally, the mechanical properties of PCM are evaluated through the hot pressing test. The effect of the types of polymer and the unit polymer content are evaluated by analyzing the compressive strength and modulus of elasticity.

2. Experimental Procedure

This study evaluated the combustion characteristics of PCMs by means of cone calorimeter, noncombustibility, and flammability tests with varying experimental parameters such as polymer type, unit polymer content, polymer-cement ratio, and thickness of the specimen [15, 16]. This study also evaluated the compressive strength and elastic modulus of PCMs containing four types of polymers (ethylene-vinyl acetate copolymer (EVA), vinyl acetate-vinyl versatate (VVA), styrene butadiene rubber (SBR), and polyacrylic ester (PAE)) with focus on the effects of the type of polymer, unit polymer content, and polymer-cement ratio.

2.1. Combustion Properties of PCM

Menards

2.1.1. Materials and Composition

Handbook Of Polymer Modified Concrete And Mortar Pdf Free

Portland cement and fine aggregate (fineness modulus 2.97, density 2.63 g/cm³, and water absorption 1.81%) were used to produce the mortar. Polymers specified in JIS A 6203 (polymer dispersions and redispersible polymer powders for cement modifiers), EVA, VVA, PAE, and SBR were used for cement modifiers. Meanwhile, 1% of a blowing agent was added to the redispersible polymer powders. 1% of the blowing agent was added to the polymer dispersion at different total solid ratios. Sixty compositions were used for the tests, with a fixed cement-fine aggregate (mass ratio of 1 : 3) and various polymer types, polymer amounts, and W/C values. In this study, the amount of the polymer is expressed as weight per unit volume. For example, 10 kg/m³ of the unit polymer weight in the PCM composition corresponds to 2% polymer-cement ratio. Flat specimens (100 × 100 × 10 (mm)) were used for the heat release rate tests and cylindrical specimens (diameter 44 × 50 (mm)) were used for the noncombustibility tests. The 100 × 100 × 400 (mm) specimen used for the ignition test was cut into three types of test pieces, 100 × 100 × 10 (mm), 100 × 100 × 30 (mm), and 100 × 100 × 50 (mm), after water curing (20°C) for four weeks. The physical properties of the polymers used are presented in Table 1. Table 2 shows the PCM composition and experimental parameters. All the specimens were cured for four weeks in water at 20°C and then subjected to air curing at 20°C and 60% RH for nine weeks. Finally, the samples were dried at 60°C and cooled to room temperature in a desiccator for three days before testing. Two specimens with 0.5%–2.0% water absorption were subjected to the heat release rate and ignition tests. Three specimens with 2.0%–4.0% water absorption were subjected to the noncombustibility test.