نتایج جستجو برای: Sulfate resistant concretes
تعداد نتایج: 251073 فیلتر نتایج به سال:
micro silica (ms) is an extremely fine, spherical powder that is used as an additive for improving concrete performance. it is obtained as a by product of silicon metal and ferrosilicon alloy production. due to its pozzolanic nature, micro silica can be used to enhance the qualities of both fresh and hardened concrete. addition of micro silica into the concrete as a cement replacement, dec...
In order to increase the durability of concrete in maritime environments, it is often recommended use supplementary cementing materials such as silica fume or blast furnace slag. Metakaolin, even low purity, also allows a significant improvement chloride diffusion. The aim this work was evaluate characteristics concretes based on flash metakaolin when exposed marine environment. Concretes CEM I...
The development and implementation of “green” technologies in the construction sector, which ensure natural resource conservation, reduce harmful emissions provide utilization industrial waste, are key issues material engineering XXI century. Extensive research has been devoted to solving these issues, including field concrete science. Still, issue developing compositions with increased corrosi...
from june 1992 to march 1993, a group of patients suffering from different types of warts were treated with intralesional injections of bleomycin sulfate. this study reviews the literature concerning this modality of treatment and the pathophysiology and immunohistopathology of warts and options for treatment. in this prospective study, a combination of a i mg/ml solution of bleomycin in distil...
Introduction: The paper addresses the effect of a composite modifying mineral additive based on waste — tailings from Balkhash Mining and Processing Plant microsilica structural characteristics performance heavy concrete. Purpose study: We aimed to select optimal B25 B35 concrete mixes MV-D20 modified binder with in its composition evaluate Methods: In course study, standard methods were used d...
Shotcrete is often in direct contact with groundwater containing sulfate. The resistance to sulfate attack of modern sprayed concretes produced non-alkali aluminate-based accelerators combination different cement types related their microstructure, transport properties, porosity and phase composition. A characterization these properties allows a comprehensive assessment the shotcrete identifica...
The main strategy to reduce the environmental impact of the concrete industry is to reuse the waste materials. This research has considered the combination of cement replacement by industrial by-products, and natural coarse aggregate substitution by recycled aggregate. The aim is to evaluate the behavior of concretes with a reduced impact on the environment by replacing a 50% of cement by indus...
Concretes used in marine environment are generally under the cyclic effect of CO2 and chloride ions (Cl -). To date, the influence of carbonation on ingress of chloride ions in concretes has been widely studied; in comparison, study on the influence of Clon the progress of carbonation is limited. During the study, concretes were exposed to independent and combined mechanisms of carbonation and ...
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