The report presents concretes properties at high temperature of 2 concretes B40 and B60. These properties have been studied extensively in the frame of several research and expertise projects, including thesis projects. The report provides the composition of the 2 concretes and their constituents, mass transport properties (porosity, permeability.....
ICAAR 2020-2022, 16th International Conference on Alkali-Aggregate Reaction in Concrete, Lisbonne, PORTUGAL, 31-/05/2022 - 02/06/2022
Les présentes recommandations définissent des dispositions destinées à prévenir les dégradations du béton par des cycles de gel-dégel avec ou sans sels de déverglaçage. Le domaine d'application est celui des bâtiments non courants ou des ouvrages de génie civil soumis à du gel modéré avec emploi de sels de déverglaçage ou à du gel sévère. Elles s'a...
This paper presents a physical characterization for the recycling into new concretes of three comminuted concretes: C16/20 (“ordinary concrete”), C50/60 (“high strength concrete”), and C70/85 (“very high strength concrete”). The top size of the crushed concretes was 19.1 mm and the size range was 4.75 to 19.1 mm. The characterization was carried ou...
Concrete from deconstruction can have a second life in the form of recycled concrete aggregates (RCAs). They unfortunately have poor properties (high porosity and water absorption coefficient (WAC)) with respect to natural aggregates. Accelerated carbonation was implemented to improve the RCA properties and to increase their use by storing carbon d...
4th International Conference on Bio-Based Building Materials, Barcelone, ESPAGNE, 16-/06/2021 - 18/06/2021
Concrete mixing can lead to mechanical degradation of aggregates, particularly when dealing with recycled concrete aggregates. In this work, the attrition of such materials during mixing is studied by means of experiments and simulations. The effect of the presence of fines, water addition, flow configuration of the mixer (co- or counter-current) a...
A literature review comprising 163 publications published over a period of 26 years from 1992 to 2018 is presented in this paper. This review discusses the generation and recycling of construction and demolition waste (CDW) as well as its main uses as raw materials for the construction engineering sector. This review pays attention to the use of CD...
Water saturation profiles in concrete are essential to assess its durability and can be determined using non-destructive techniques, especially the electric and the capacitive methods. In this paper, we propose a new inversion scheme where both resistivity and permittivity measurements are inverted jointly to retrieve the saturation profile. The fi...
Hemp concretes are the most widely used biobased concretes in France. However, their growth is still limited by the lack of knowledge and high variability of the performances of biobased concretes, especially for their mechanical properties. These results are related to interactions between the mineral binder and plant compounds that modify the hyd...
