Abstract
The technology of concrete has significantly increased in recent years through the use of super plasticizer and availability of mineral additions. One of the most recent materials used as an additive, replacing a portion of cement in concrete, is fine clay fired at a temperature of 800℃ to 900℃. This research is based on trials that complied with artificial pozzolan (waste crushed brick), and their effect on the rheological and mechanical behavior of mortar. The addition of 5% of a waste crushed brick has helped not only to improve the strength (tensile and compression), but also to foster a better rheological behavior in terms of fluidity and stability, with a low heat of hydration compared to control. However, tests of optimizing the content of self-compacting concrete (SCC) in coarse aggregates, sand and binder, led us to confirm that the combined mass of more optimal (better workability and stability) is that based on low in volumetric percentage of sand/paste with a granular skeleton richest gravel low dimensions (2/3 of G 3/8 and 1/3 of G 8/15).
Highlights
The use of treated clays, that are rich in SiO2 and Al2O3, is a new development in concrete technology
The addition of 5% of a waste crushed brick has helped to improve the strength, and to foster a better rheological behavior in terms of fluidity and stability, with a low heat of hydration compared to control
Tests of optimizing the content of self-compacting concrete (SCC) in coarse aggregates, sand and binder, led us to confirm that the combined mass of more optimal is that based on low in volumetric percentage of sand/paste with a granular skeleton richest gravel low dimensions (2/3 of G 3/8 and 1/3 of G 8/15)
Summary
The use of treated clays, that are rich in SiO2 and Al2O3, is a new development in concrete technology. Many activities have been done are related to the use of clay minerals such as kaolinite, and other mixtures of clay minerals that have pozzolic activity which promote sustainable development of mechanical performance of grout, mortar or concrete with cement [1,2]. The role of the paste (cement + water + air occluded + additives) is to remove the agglomeration of aggregates, and to reduce friction that causes the limitation towards the flowability of concrete and the ability to fill the moulds [4]. It is strongly recommended to add more of a mineral additive to meet the rheological and mechanical requirements of SCC. Fine siliceous material when added to SCC lead to similar properties of high-performance concrete (Clergue and Monachon, 1998) [7], in term of increase the compactness and higher strength. The fines minerals, to determine their pouzzolanicity by mechanical tests and to study the influence of the addition on the rheological behavior and mechanical mortar’s
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