Polymers are added to asphalt binders primarily to stiffen the binder at higher temperatures and thus to protect the pavement against rutting at summertime temperatures early in the pavement's life. Also, it has been noted that polymers typically increase the ductility of a binder and that some polymer-asphalt combinations are especially effective. Furthermore, it is hypothesized that enhancing a binder's ductility, and maintaining this enhancement with binder oxidative aging, contributes to enhanced binder durability in pavements. However, polymer-asphalt interactions and how they might contribute to improved binder performance is not well understood. The goal of this work was to probe the relationship of polymer morphology on asphalt binder rheology and mixture durability. Experiments were conducted on asphalt mixtures and binders, and as a function of oxidative aging. PFC mixtures, which are an open mixture designed to allow enhanced water drainage, were of specific interest. These mixtures were tested for Cantabro Loss, an indicator of a mixture's likelihood of failure by raveling. Asphalt binders were tested using dynamic shear rheometry (DSR), which provided the DSR function, (G' /η'/G'), a measure of binder stiffness that includes both the elastic modulus and the flow viscosity), ductility (used to measure the elongation a binder could withstand before failure), gel permeation chromatography (GPC), used to estimate the relative amount of polymer) and fluorescence microscopy (used to image the polymer morphology in the asphalt binder). From these data, relationships were assessed between binder morphology and binder rheology and between binder rheology and mixture durability, all as a function of binder oxidative aging. Polymer morphology related to ductility enhancement. Polymer morphology related to a change in the DSR function, relative to the amount of polymer, as measured by the polymer GPC peak height. Cantabro loss correlated to the DSR function (R2=0.963). The overall conclusion is that polymer morphology, as indicated by fluorescence microscopy, relates to both the rheological properties of the binder and the Cantabro loss of the mixture. These relationships should yield a better understanding of polymer modification, increased mixture durability (decreased raveling) and improved rheological properties (DSR function and ductility).

京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第21062号 / 工博第4426号 / 新制||工||1688(附属図書館) / 京都大学大学院工学研究科都市社会工学専攻 / (主査)教授 河野 広隆, 准教授 服部 篤史, 准教授 山本 貴士 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

The thesis deals with composite systems, with a focus on matrix resistant to extreme conditions. The aim of this work was to research and development matrix, resistant to high temperatures, typical in case of fire. Used theoretical knowledge were realized with subsequent laboratory research. Attention was paid matrices based binder mixed with any alkali activation of alternative raw materials and geopolymers. Scattered reinforcement featured polypropylene fibers. The subject of the practical part of the two alternatives, including a matrix based on basic ingredients - cement, alternative raw materials - high fly ash, blast furnace slag, geopolymer and polymeric components incl. combinations thereof. Laboratory research conducted by determining the fundamental material properties such as density, strengths, etc., after heat exposure. The developed materials were subjected to a temperature 1400 ° C. The conclusion was selected several recipes that were based on the resulting values found to be optimal.

The diploma thesis is focused on fire-resistant repair mortar with fine-grained filler. The aim of this work is the research and development of fine-grained Mortars resistant to high temperatures, which are characteristic at the beginning of the fire. The theoretical knowledge with subsequently realized laboratory verification was used. At-tention was paid to the masses based on the mixed binder comprising cement and blast furnace slag, respectively. high-temperature ash. Cellulose fibres were used as the dis-persed reinforcement. Two kinds of aggregate were assessed - fly ash agloporit and am-phibolite incl. combinations thereof. Laboratory tests were carried out via determination of basic material properties (density, strength, consistency, dimensional changes etc.) after exposure to extreme temperatures. A substantial part of the research was also study of different cooling conditions - slow and fast (water and air). Selected formulations were subjected to temperatures up to 1200 ° C. In the conclusion is selected several recipes that have been found to be optimal for continuing research on the basis of the results and findings.

The diploma thesis is focused on polymercement materials with dispersed reinforcement. The aim of this work is development of suitable polymercement mixture and monitoring of the impact of dispersed reinforcement on the course of maturation of these materials and physico-mechanical properties. The effect of high temperatures on the properties of the mortar is also examined. Emphasis is placed on the use of alternative resources and byproducts. Mixed binder of cement and slag and admixture of microsilica was used. Recycled cellulose was used as dispersed reinforcement and was compared with commercial polypropylene fibers.