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Download 15Mb Abstract Cement replacement materials are by-products used to produce high performance concrete. Published data on the effects of combinations of mineral admixtures in concrete on the microstructural and performance-related properties under different curing regimes are comparatively little.
Further the correlation of strength of concrete to its permeability and pore structure is also not clear. The properties investigated included workability of the fresh concrete, engineering properties such as cube and modified cube compressive strength, flexural strength, dynamic modulus of elasticity, pulse velocity, shrinkage and swelling, permeability and microstructural properties such as porosity and pore size distribution.
The results show that prolonged dry curing results in lower strengths, higher porosity, coarser pore structure and more permeable concretes. It was found that the loss in early age compressive strength due to incorporation of fly ash or slag can be compensated for by the addition of small amounts of silica fume.
The engineering and microstructural properties and permeability of concretes containing fly ash or slag appear to be more sensitive to poor curing than the control concrete, with the sensitivity increasing with increasing amounts of fly ash or slag in the mixtures.
The incorporation of high volumes of slag in the concrete mixtures refined the pore structure and produced concretes with very low porosity and threshold diameters. The results emphasize that a minimum 7-day wet curing is needed for concrete with mineral admixtures to develop the full potential, and that continued exposure to a drying environment can have adverse effects on the long-term durability of inadequately cured slag or fly ash concretes.
The results also confirm that compressive strength alone is not an adequate index to judge the performance of concrete, and the knowledge of the strength, pore structure and permeability are required for this purpose.Nowadays, only a small percentage of waste tyres are being land-filled.
The Recycled Tyre Rubber is being used in new tyres, in tyre-derived fuel, in civil engineering applications and products, in moulded rubber products, in agricultural uses, recreational and sports applications and in . concrete, with improved performance in fresh and hardened state.
Present thesis addresses two main topics Design Ultra High Performance Concrete mixes (UHPC). Concrete is one of the building materials widely used in civil engineering. When concrete strutures are exposed in severe environment, its performance becomes inferior, which decreases its durability and leads it to damage in advance.
It has become a hot topic to study for the civil engineering to improve durability of timberdesignmag.com special performances, nano-material was called new material.
David completed his bachelors in Physics honours from St. Stephens College, University of Delhi. Thereafter, he proceeded with his MTech in Geophysical Technology from IIT Roorkee, His dissertation work was on the topic of “2D Modeling and Inversion of .
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