Temporal flowability evolution of slag-based self-compacting concrete with recycled concrete aggregate
نویسندگان
چکیده
The addition of by-products, such as recycled concrete aggregate and ground granulated blast furnace slag, modify the in-fresh flowability ordinary self-compacting both initially over time. A detailed study is presented in this paper 18 mixtures (SF3 slump-flow class) containing 100% coarse aggregate, two types cement (CEM I or CEM III/A, latter with 45% slag), different contents fine (0, 50, 100%), three powders (ultra-fine limestone powder <0.063 mm, fines 0/0.5 mm). temporal evolution slump flow, viscosity, passing ability, values segregation resistance, air content, fresh hardened density, compressive strength were evaluated all mixtures. III/A improved initial flow ability by 6%, due to their higher proportion fines. Nevertheless, loss within 60 min was 5.8% lower when adding natural I. Viscosity content increased 26% on average following additions unlike slag. Flowability mm. According multi-criteria analyses, 50% mm showed an optimal balance between (SF2 class after mixing process), strengths (around MPa), carbon footprints. • Effect binder type, RCA, SCC. GGBFS RCA worsened it long term. Loss statistically predicted from aggregates’ water absorption. Placement SCC high amounts waste production feasible. Optimum sustainability behavior RCA.
منابع مشابه
Experimental Study on Thermal Conductivity of Self-Compacting Concrete with Recycled Aggregate
The research focuses on the use of recycled aggregate (RA), from waste pieces generated during production in precast plants for self-compacting concrete (SCC) manufactured with a double sustainable goal: recycle manufacturing waste (consumption) and improvement of the thermal properties of the manufactured product (energy efficiency). For this purpose, a mechanical study to ensure technical fea...
متن کاملmechanical and durability properties of slag based recycled aggregate concrete
in this paper, the possibility of using recycled aggregate (ra) and ground granulated blast furnace slag (ggbfs) to produce a structural concrete was studied by compromising strength to a lesser extent. hence an attempt has been made to study the strength and durability characteristics of the ggbfs-based recycled aggregate concrete. four different groups of mixes were designed by replacing natu...
متن کاملReactivity in Recycled Concrete Aggregate
Full scale tests with crushed concrete used in sub-bases in roads show that the material has capacity to reharden, very slowly but also after prolonged periods of time. The rehardening process in crushed concrete aggregate has been analysed with a thermogravimetric method, comparing the change in chemical composition in the aggregate when set with water, compacted and hardened. It has been show...
متن کاملAssessing relationships among properties of demolished concrete, recycled aggregate and recycled aggregate concrete using regression analysis.
Recycled demolished concrete (DC) as recycled aggregate (RA) and recycled aggregate concrete (RAC) is generally suitable for most construction applications. Low-grade applications, including sub-base and roadwork, have been implemented in many countries; however, higher-grade activities are rarely considered. This paper examines relationships among DC characteristics, properties of their RA and...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Cleaner Production
سال: 2021
ISSN: ['0959-6526', '1879-1786']
DOI: https://doi.org/10.1016/j.jclepro.2021.126890