Abstract
The aim of this work is to study the influence of mineral additions on the rheological behavior of low impact environmental concrete with its concrete equivalent mortar (CEM) at different temperatures.The experimental study is carried out on cement-based CEM substituted by two additions namely, natural pozzolana (PZ) and marble powder (PM), with a substitution rate of 5 to 20%, a ratio of water on binder E / L = 0.5 and a percentage of superplasticizer based on polycarboxylates SP = 0.30%. The rheological parameters, the workability and the flow time of the mixtures were tested by a coaxial rheometer, a mini cone and the LCPC maniabilitimetre respectively at 10 ° C, 20 ° C and 30 ° C. The results show that the substitution of cement by natural pozzolana and marble powder in binary system generally improved viscosity and yield stress at 20°C and 30°C, while at 10°C natural pozzolana negatively affected the rheological parameters and workability.
Highlights
The composition of a concrete mixture must be more environmentally friendly
To evaluate the modifications induced by natural pozzolana on the concrete equivalent mortars in a standard environment, we tested 4 compositions of CEM made from natural pozzolana and one composition made without addition and taken as a control
It is noted that the coupled effect of the temperature and the pozzolana was beneficial to 30 ° C against a low temperature of 10 ° C negatively affected the yield stress and plastic viscosity
Summary
The composition of a concrete mixture must be more environmentally friendly. It is essential to reduce the production of cement, the main component of concrete and the most CO2 emitting component For this purpose, it is imperative to develop eco-mortars and concretes with low environmental impact in which a part of cement is replaced by mineral additions. During the development of these materials, many parameters must be mastered Among these parameters, workability and implementation are very important, due to their essential role in the construction process and their influence on the mechanical properties and durability of cured concrete to a certain extent. Being able to qualify and quantify the fresh concrete rheological behavior is an important asset in construction field This is especially important when attaching special importance to the influence of mineral additions and temperature. The aim of this work is to study the mineral additions-temperature coupled effect on low environmental impact concrete rheological behavior of by their concrete equivalent mortars (CEM), mainly based on local materials. and available (natural or from industrial waste) such as natural pozzolana and marble powder and their effects in an ambient temperature of 10 ° C, 20 ° C and 30 ° C
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