ACI 301M-10: Metric Specifications for Structural Concrete by ACI Committee 301

By ACI Committee 301

This can be a Reference Specification that the Architect/Engineer can practice to any building venture related to structural concrete by means of bringing up it within the venture necessities. Checklists are supplied to aid the Architect/Engineer in supplementing the provisions of this Reference Specification as wanted via designating or specifying person undertaking specifications. the 1st 5 sections of this rfile conceal common building requisites for cast-in-place structural concrete and slabs-on-ground. those sections conceal fabrics and proportioning of concrete; reinforcement and prestressing metal; construction, putting, completing, and curing of concrete; formwork functionality standards and development; therapy of joints; embedded goods; fix of floor defects; and completing of shaped and unformed surfaces. Provisions governing checking out, review, and recognition of concrete in addition to popularity of the constructions are integrated. the rest sections are dedicated to architectural concrete, light-weight concrete, mass concrete, post-tensioned concrete, shrinkagecompensating concrete, business ground slabs, tilt-up development, precast structural concrete, and precast architectural concrete.

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Secondary ions traveling at an angle of ® = 50° were subjected to energy analysis; The incident and scattered beams lay in a plane passing through the [010] axis of the molybdenum single crystal. We see from the oscillogram that, as in the case of the bombardment of the (100), (110), and (111) faces of a tungsten target with alkali metal ions [1-5], so also in the present case the high-energy part of the spectrum exhibits peaks with energies greater than those of the singlyscattered ion peak. The peaks with the greatest energies correspond to ions which have been doubly scattered at atoms in the [010] and [021] directions, while the peak lying close to the peaks of the slow and evaporated ions represents the energies of ions which have experienced single collisions at the [000] atom.

1. Curves relating K_ and obtained by bombarding· the NiCr alloy with K+ (a) and y to the energy of the bombardCs+ (b) ions. The contribution of the negative ions to the ing K+ ions on NiCr (a); Cs+ on secondary emission of negative particles is considerable NiCr (b); Na+ on CuBe (c). (Fig. 1a) and in some cases even dominant (b). Hence in such investigations it is essential to allow for the secondary emission of negative ions from the effective alloy emitters used in the multipliers. The values of y for both ions increase linearly with rising Eo.

However, on the basis of available results [6], we may consider that the depth of penetration in the case of a metal irradiated with inert-gas ions fluctuates up to the extent of several atomic layers.

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