sant, respectivement, des ajouts cimentaires et des matériaux granulaires beaucoup de sous-produits industriels et autres ajouts cimentaires alternatifs ne . Le mélange de CPC et d’ajouts cimentaires, comme du laitier ou des cendres volantes, produit un ciment de performance comparable à celle d’un ciment. Prévision de la résistance a la compression des bétons aux ajouts cimentaires a l ‘aide du modèle hybride RNAs et les GAs. Presentation · May.
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However, a ternary system with silica fume and fly ash has shown lower magnitude of shrinkage and finer pore system among cjmentaires cementitious systems investigated.
CAN/CSA-A | Standards Council of Canada – Conseil canadien des normes
Some features of this site may not work without it. Services Articles citing this article CrossRef 2. Data correspond to usage on the plateform after Pore system characterization was performed at different ages using the mercury intrusion porosimetry technique MIP. This work lies within the general scope of the valorization of local materials, having for interest the improvement of the physicochemical and mechanical characteristics of the products resulting from recovery entering the clothes industry of the elements of structures and construction.
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Ciment portland au calcaire
Generally, pores ranging between 50 and 10 nm dominate the pore population. Article Abstract PDF Abstract At the present time, high-performance concrete HPC has become widely used throughout the world in various construction fields. The results obtained are mainly dependent on the measurement set-up used and the choice of the starting point of autogenous shrinkage strains measurement. The first is based on the concept of threshold of solidification using the maxima of thermal flux while the second is based on the rate of deformation.
Metrics Show article metrics. This study highlights fundamental aspects pore system and shrinkage resulting from the use of mineral admixtures in HPC.
In this research, two new approaches were proposed in order to determine, with more accuracy, the starting point of shrinkage and to separate effective self-dessiccation shrinkage from endoplastic deformations.
The pore system of concretes tested is characterized by very fine capillary pores smaller than 60 nm. Usually, self-desiccation shrinkage measurement is very complex, particularly cimetnaires dealing with massive concrete for which hydration heat thermal strains and self-desiccation shrinkage evolve simultaneously.
Ciment portland au calcaire
It was also established that the self-desiccation shrinkage is intimately related to change in the capillary pore’s structure, especially the evolution of the threshold pore radius. These results put forward the influence of the sandy and muddy clay additions, on the properties of cementing materials, thus showing the economic and environmental interest of the substitution of the clinker by the cimentairez clays. Cikentaires system is the best choice combining low shrinkage and excellent mechanical properties.
Chikouche 1 et K.
Compared with a Portland cement, it is noted, that with each increase in the rate of addition, a reduction in the calcium oxide rate and a growth of the silica rate. The use of a binary system with glass frit as alternative cementitious material and metakaolin were harmful for shrinkage development, particularly at early age.
The mud and the abundant red argillaceous marl in the area, contain kaolin and iolite. Even though this concrete has shown good mechanical cimehtaires and appropriate durability, this material is also known for its high sensitivity to early-age cracking related to the high thermal and self-desiccation shrinkages produced during the progress of binder hydration.
Show full document record. The incorporation of cementitious materials considerably reduces both the total pore volume and the population of coarser pores, and increases the amount of pores smaller than 15 nm.
Author s Meddah, Mohammed Seddik. Refinement of these pores mainly depends on the type, proportion, and fineness, as well as particle size distribution of the mineral admixtures incorporated. Bibi 1M.