New PDF release: A Palaeogeological Map of the Lower Palaeozoic Floor below

By Wills, L. J.

ISBN-10: 0707300487

ISBN-13: 9780707300481

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Extra resources for A Palaeogeological Map of the Lower Palaeozoic Floor below the cover of Upper Devonian, Carboniferous and Later Formations: with inferred and speculative reconstructions of Lower Palaeozoic and Precambrian outcrops in adjacent areas

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All laboratory mixing and testing should be done at the same temperature and humidity as will be expected at the structure site. However, the temperature and humidity should also be within acceptable limits. S. Army Corps of Engineers (COE) Specification CRD-C-611 is equivalent to ASTM C939. It has been found that some grouts passing the COE specification, but having efflux times of less than 30 s, may be susceptible to segregation. The flow table, ASTM C230, can be used to measure fluidity of thixotropic grouts.

Mineral admixtures may be used to reduce the heat of hydration, increase long-term strength, decrease permeability, and control bleeding. The commonly used mineral admixtures are fly ash, ground granulated blast-furnace slag, and silica fume or microsilica. Silica fume and latex modifiers are added to reduce permeability for improved corrosion performance. Fly ash (Class C and Class F) should meet ASTM C618, Standard Specification for Coal Fly Ash and Raw or Calcinated Natural Pozzolan for Use as a Mineral Admixture in Concrete.

This can lead to brittle fracture of individual wires in a strand or tendon and ultimately the failure of the tendon and prestressed concrete member. Pitting corrosion is also a source of atomic hydrogen that can contribute to possible hydrogen embrittlement of the highstrength steel strands. Environmentally induced cracking (EIC) is when the combination of a corrosive environment and tensile stresses induces a brittle fracture in a normally ductile alloy. The tensile stress is static and there is a threshold stress below which EIC will not occur.

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A Palaeogeological Map of the Lower Palaeozoic Floor below the cover of Upper Devonian, Carboniferous and Later Formations: with inferred and speculative reconstructions of Lower Palaeozoic and Precambrian outcrops in adjacent areas by Wills, L. J.


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