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Ocena możliwości zastosowania w budownictwie odpadowych pyłów mineralnych jako składników kompozytów polimerowo-cementowych

Beata Eliza Jaworska

Abstract

The subject of the PhD Thesis is the impact of the partial substitution of cement with mineral wastes on the properties of polymer-cement composites. The modification consisted in replacing a part of cement by siliceous fly ash, calcareous fly ash (the by-products of respectively coal and lignite combustion process) and waste perlite powder – by-product of ekspandation and fractionation of perlite. The thesis on the possibility of the introduction of waste mineral powders into polymer-cement composites was formulated. This approach is a part of sustainable development strategy as new way of utilization of the burdensome waste products. The PhD Thesis presents a general characteristics and application area of polymercement composites, discusses the significance of polymer modifier and its influence on the performance of the composite. Considering above, the mineral powders, which are the subject of interest in the study, and their application were characterized. Based on analysis of data from literature the criteria were formulated, which were taken into account when selecting the components of polymer-cement composites containing mineral powders and later during the material optimization. As a result of preliminary tests the granulometric characteristics of powders were determined. For each powder a specific surface area, density as well as the chemical composition were determined. In the next stage of research the cement mortars modified with three types of polymer were tested and the impact of polymer additive on the strength of the material was analysed. In the next step the compressive strength, flexural strength and tensile strength of polymer-cement mortar modified with the chosen polymer and selected types of mineral powder were tested. Simultaneously, the technological properties of the composites mixes were analyzed. Based on the results of preliminary studies and literature data the program of material optimization has been developed. A dispersion of styrene-acrylic copolymer was used as a polymer modifier. As the material variables the proportions (by mass) between the contents of components of polymer-cement composite, i.e. cement/polymer and cement/mineral powder were accepted. The technical characteristics cover: compressive strength, flexural strength, elasticity modulus, elongation of tension and apparent density of hardened polymercement composite. The compositions of tested polymer-cement composites were determined using the statistical experimental design. The results of laboratory tests were the basis for the determination of material models of polymer-cement composite modified with mineral powders. This models were determined in the form of regression function as the second degree polynomials describing the relation between the analysed properties and polymer-cement composition, allowing to identify the optimal compositions due to the particular property. Analysis of the obtained relations confirmed the good adequacy of the models and their good agreement with the experimental results. Taking under consideration the potential application of PCC and technical properties important in the particular applications, optimal compositions of polymer-cement composites were determined; the concept of overall desirability was used. Based on the results obtained during optimization, the basic properties of polymercement composites with mineral powders (optimal compositions) were tested. The tested properties, among others, were: freeze/thaw resistance, chemical resistance – carbonation, water absorption, shrinkage, adhesion and abrasion. Also the observation of the microstructure of these composites using a scanning electron microscope (SEM) was carried out. The obtained results and their analysis enabled the formulation of conditions for effective substitution of cement binder with mineral powders and identification of potential effects of this substitution. Thus, the aim of the work has been achieved and thesis are confirmed. It was shown that it is possible to use the waste mineral powders as components of the polymer-cement composites, however, there is a limit of powder content, above which the technical properties of the composite start to worsen. A large part of the research presented in this PhD Thesis was supported by the Applied Research Program No. PBS1/A5/14/2012 of the National Centre for Research and Development entitled "Comprehensive utilization of the waste resulting from the production or use of expanded perlite" and by the Faculty of Civil Engineering of Warsaw University of Technology project “The use of waste materials as components of cement composites”. The PhD Thesis consist of 201 pages, 64 figures, 84 tables and contains attachments. List of references contains 222 items.
Record ID
WUT83deb5c4041e49ac94e3952b95526d4d
Diploma type
Doctor of Philosophy
Author
Title in Polish
Ocena możliwości zastosowania w budownictwie odpadowych pyłów mineralnych jako składników kompozytów polimerowo-cementowych
Language
(pl) Polish
Certifying Unit
Faculty of Civil Engineering (FCE)
Discipline
construction / (technology domain) / (technological sciences)
Status
Finished
Start date
30-09-2015
Defense Date
11-10-2017
Title date
18-10-2017
Supervisor
External reviewers
Artur Łagosz Artur Łagosz,, Undefined Affiliation
Pages
201
Keywords in English
polymer-cement composites
Abstract in English
The subject of the PhD Thesis is the impact of the partial substitution of cement with mineral wastes on the properties of polymer-cement composites. The modification consisted in replacing a part of cement by siliceous fly ash, calcareous fly ash (the by-products of respectively coal and lignite combustion process) and waste perlite powder – by-product of ekspandation and fractionation of perlite. The thesis on the possibility of the introduction of waste mineral powders into polymer-cement composites was formulated. This approach is a part of sustainable development strategy as new way of utilization of the burdensome waste products. The PhD Thesis presents a general characteristics and application area of polymercement composites, discusses the significance of polymer modifier and its influence on the performance of the composite. Considering above, the mineral powders, which are the subject of interest in the study, and their application were characterized. Based on analysis of data from literature the criteria were formulated, which were taken into account when selecting the components of polymer-cement composites containing mineral powders and later during the material optimization. As a result of preliminary tests the granulometric characteristics of powders were determined. For each powder a specific surface area, density as well as the chemical composition were determined. In the next stage of research the cement mortars modified with three types of polymer were tested and the impact of polymer additive on the strength of the material was analysed. In the next step the compressive strength, flexural strength and tensile strength of polymer-cement mortar modified with the chosen polymer and selected types of mineral powder were tested. Simultaneously, the technological properties of the composites mixes were analyzed. Based on the results of preliminary studies and literature data the program of material optimization has been developed. A dispersion of styrene-acrylic copolymer was used as a polymer modifier. As the material variables the proportions (by mass) between the contents of components of polymer-cement composite, i.e. cement/polymer and cement/mineral powder were accepted. The technical characteristics cover: compressive strength, flexural strength, elasticity modulus, elongation of tension and apparent density of hardened polymercement composite. The compositions of tested polymer-cement composites were determined using the statistical experimental design. The results of laboratory tests were the basis for the determination of material models of polymer-cement composite modified with mineral powders. This models were determined in the form of regression function as the second degree polynomials describing the relation between the analysed properties and polymer-cement composition, allowing to identify the optimal compositions due to the particular property. Analysis of the obtained relations confirmed the good adequacy of the models and their good agreement with the experimental results. Taking under consideration the potential application of PCC and technical properties important in the particular applications, optimal compositions of polymer-cement composites were determined; the concept of overall desirability was used. Based on the results obtained during optimization, the basic properties of polymercement composites with mineral powders (optimal compositions) were tested. The tested properties, among others, were: freeze/thaw resistance, chemical resistance – carbonation, water absorption, shrinkage, adhesion and abrasion. Also the observation of the microstructure of these composites using a scanning electron microscope (SEM) was carried out. The obtained results and their analysis enabled the formulation of conditions for effective substitution of cement binder with mineral powders and identification of potential effects of this substitution. Thus, the aim of the work has been achieved and thesis are confirmed. It was shown that it is possible to use the waste mineral powders as components of the polymer-cement composites, however, there is a limit of powder content, above which the technical properties of the composite start to worsen. A large part of the research presented in this PhD Thesis was supported by the Applied Research Program No. PBS1/A5/14/2012 of the National Centre for Research and Development entitled "Comprehensive utilization of the waste resulting from the production or use of expanded perlite" and by the Faculty of Civil Engineering of Warsaw University of Technology project “The use of waste materials as components of cement composites”. The PhD Thesis consist of 201 pages, 64 figures, 84 tables and contains attachments. List of references contains 222 items.
Thesis file
  • File: 1
    Rozprawa doktorska BJaworska.pdf
    Request has been registered

Uniform Resource Identifier
https://repo.pw.edu.pl/info/phd/WUT83deb5c4041e49ac94e3952b95526d4d/
URN
urn:pw-repo:WUT83deb5c4041e49ac94e3952b95526d4d

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