By David Bennett
A precis on advancements in building, layout and the innovation in concrete expertise. It describes a couple of development reviews the place pace of building, fee mark downs and early of entirety have been a concern, and it highlights the result of a few pioneering learn on concrete technology.
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Extra resources for Innovations in Concrete
Example text
According to Lone Star, Pyrament is the only cement that offers high strength, durable, rapid-curing concrete without relying on admixtures or accelerators of any kind. In the development of Pyrament over a ten-year period, Lone Star came up with a cement that behaved in a different way to other cements. It did not behave like an OP cement with additives, because the chemistry was actually different. It is technically described as a high performance Type 1P blended hydraulic cement, meeting the requirements of ASTM C595 and modified with ‘a proprietary interground functional addition’ complying with ASTM C688.
3. e. 56 and 90 days, for high strength concrete to reach its specified strength. This encourages efficient use of mineral admixtures such as fly ash, slag and silica fume. 4. The tensile splitting strength of HSC correlates closely with compressive strength. 5. The modulus of elasticity does not increase in proportion to concrete strength and is substantially affected by the stiffness and percentage of aggregate in the mix. 6. Drying shrinkage of HSC is within the range of shrinkage movement experienced with normal strength concrete.
Fire resistance. No changes in the current cover requirements, given in BS 8110, were considered necessary. However, it should be noted that there can be a risk of spalling — possibly explosive spalling — in a fire, if the moisture content of the concrete by volume is higher than 3%. As HSC is less permeable to vapour, vapour and pore pressure due to heat near the surface builds up quickly and spalling occurs once the pore pressure exceeds the tensile capacity of the concrete. It has been found that the risk of spalling can be reduced by the addition of polypropylene fibres in the concrete.
