Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Extended water/cement ratio law for cement mortar containing recycled asphalt pavement
https://orcid.org/0000-0003-1512-9803
Highlights Effect of RAP replacement ratio, w/C and curing time on the strength of RAP-CM. Micro-structure analysis using XRD and SEM. Extended water to cement ratio law for prediction of strength development.
Abstract In this research study, the strength development of cement mortar (CM) containing recycled asphalt pavement (RAP) as fine aggregate replacement for natural sand was investigated by means of strength, X-ray diffraction and scanning electron microscopy tests. The effect of the RAP replacement ratio, water to cement ratio (w/C) and curing time on strength development was evaluated. RAP had noticeably higher water absorption at saturated surface dry (SSD) state and slower rate of absorption than sand. The additional water to be compensated for the SSD state remained as the free water in the mix after hardening. RAP replacement at an optimum ratio of 25% increased the production of cementitious products and compressive strength for low w/C of <0.5, which was insufficient for cement hydration. While RAP replacement caused larger porosity and the production of lower cementitious products and compressive strength for high w/C of >0.5. Based on the critical analysis of the test results, the combined water (w*) parameter was defined as the sum of reacted water (w) and after-hardening unabsorbed water (wu). This parameter was used to generate the extended water to cement ratio law for prediction of strength development in RAP-CM. The outcome of this research will facilitate the mix design of RAP-CM at various RAP replacement ratios, w/C ratios and curing times.
Extended water/cement ratio law for cement mortar containing recycled asphalt pavement
https://orcid.org/0000-0003-1512-9803
Highlights Effect of RAP replacement ratio, w/C and curing time on the strength of RAP-CM. Micro-structure analysis using XRD and SEM. Extended water to cement ratio law for prediction of strength development.
Abstract In this research study, the strength development of cement mortar (CM) containing recycled asphalt pavement (RAP) as fine aggregate replacement for natural sand was investigated by means of strength, X-ray diffraction and scanning electron microscopy tests. The effect of the RAP replacement ratio, water to cement ratio (w/C) and curing time on strength development was evaluated. RAP had noticeably higher water absorption at saturated surface dry (SSD) state and slower rate of absorption than sand. The additional water to be compensated for the SSD state remained as the free water in the mix after hardening. RAP replacement at an optimum ratio of 25% increased the production of cementitious products and compressive strength for low w/C of <0.5, which was insufficient for cement hydration. While RAP replacement caused larger porosity and the production of lower cementitious products and compressive strength for high w/C of >0.5. Based on the critical analysis of the test results, the combined water (w*) parameter was defined as the sum of reacted water (w) and after-hardening unabsorbed water (wu). This parameter was used to generate the extended water to cement ratio law for prediction of strength development in RAP-CM. The outcome of this research will facilitate the mix design of RAP-CM at various RAP replacement ratios, w/C ratios and curing times.
Extended water/cement ratio law for cement mortar containing recycled asphalt pavement
https://orcid.org/0000-0003-1512-9803
Highlights Effect of RAP replacement ratio, w/C and curing time on the strength of RAP-CM. Micro-structure analysis using XRD and SEM. Extended water to cement ratio law for prediction of strength development.
Abstract In this research study, the strength development of cement mortar (CM) containing recycled asphalt pavement (RAP) as fine aggregate replacement for natural sand was investigated by means of strength, X-ray diffraction and scanning electron microscopy tests. The effect of the RAP replacement ratio, water to cement ratio (w/C) and curing time on strength development was evaluated. RAP had noticeably higher water absorption at saturated surface dry (SSD) state and slower rate of absorption than sand. The additional water to be compensated for the SSD state remained as the free water in the mix after hardening. RAP replacement at an optimum ratio of 25% increased the production of cementitious products and compressive strength for low w/C of <0.5, which was insufficient for cement hydration. While RAP replacement caused larger porosity and the production of lower cementitious products and compressive strength for high w/C of >0.5. Based on the critical analysis of the test results, the combined water (w*) parameter was defined as the sum of reacted water (w) and after-hardening unabsorbed water (wu). This parameter was used to generate the extended water to cement ratio law for prediction of strength development in RAP-CM. The outcome of this research will facilitate the mix design of RAP-CM at various RAP replacement ratios, w/C ratios and curing times.
Extended water/cement ratio law for cement mortar containing recycled asphalt pavement
Chaidachatorn, Komkorn (Autor:in) / Suebsuk, Jirayut (Autor:in) / Horpibulsuk, Suksun (Autor:in) / Arulrajah, Arul (Autor:in)
Construction and Building Materials ; 196 ; 457-467
04.11.2018
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
<italic>A</italic> , water absorption , first empirical material constant for strength prediction , <italic>AS</italic> , asphalt content , <italic>B</italic> , second empirical material constant for strength prediction , <italic>C</italic> , cement content , <italic>C<inf>e</inf></italic> , equivalent retardant cement content , <italic>C<inf>i</inf></italic> , difference of input cement , CM , cement mortar , DOH , Department of Highway, Thailand , <italic>k</italic> , retardant factor , <italic>R<sup>2</sup></italic> , coefficient of determination , RAP , recycled asphalt pavement , RAP-CM , cement mortar containing recycled asphalt pavement , SEM , scanning electron microscopy , SSD , saturated surface dry , <italic>w</italic> , reacted water , <italic>w*</italic> , combined water which is the sum of reacted water and after-hardening, unabsorbed water , <italic>w*/C</italic> , combined water in hardened RAP-CM to cement , <italic>w/C</italic> , water to cement ratio , <italic>W<inf>AS</inf></italic> , weight of asphalt binder , <italic>W<inf>S</inf></italic> , weight of solid , <italic>w<inf>u</inf></italic> , after-hardening unabsorbed water , XRD , X-ray diffraction , XRF , X-ray fluorescence , <italic>σ</italic> <inf>c</inf> , compressive strength , <italic>σ<inf>c,d</inf></italic> , compressive strength at d days of curing , <italic>σ</italic> <inf>c,28</inf> <italic><inf>d</inf></italic> , compressive strength at 28 days of curing , Strength , Workability , Mortar , Recycled asphalt pavement , X-ray powder diffraction , Scanning electron microscope
Extended water/cement ratio law for cement mortar containing recycled asphalt pavement
| British Library Online Contents | 2019
Properties of Cement Asphalt Emulsion Mortar for Pavement
| British Library Conference Proceedings | 2013
Properties of Cement Asphalt Emulsion Mortar for Pavement
| Tema Archiv | 2013
Properties of Cement Asphalt Emulsion Mortar for Pavement
| Trans Tech Publications | 2013