By ACI Committee 301

ISBN-10: 0870314114

ISBN-13: 9780870314117

It is a Reference Specification that the Architect/Engineer can observe to any building venture related to structural concrete through bringing up it within the undertaking requisites. Checklists are supplied to help the Architect/Engineer in supplementing the provisions of this Reference Specification as wanted via designating or specifying person undertaking standards. the 1st 5 sections of this record disguise basic development standards for cast-in-place structural concrete and slabs-on-ground. those sections disguise fabrics and proportioning of concrete; reinforcement and prestressing metal; construction, putting, completing, and curing of concrete; formwork functionality standards and development; remedy of joints; embedded goods; fix of floor defects; and completing of shaped and unformed surfaces. Provisions governing trying out, evaluate, and popularity of concrete in addition to recognition of the constructions are incorporated. the rest sections are dedicated to architectural concrete, light-weight concrete, mass concrete, post-tensioned concrete, shrinkagecompensating concrete, commercial ground slabs, tilt-up development, precast structural concrete, and precast architectural concrete.

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Extra info for ACI 301M-10: Metric Specifications for Structural Concrete

Sample text

Direct digital systems have an inherent phase lag associated with their finite sampling period. It was soon noticed that the problem of actuator resonance was less severe on systems controlled digitally. Although not good as far as other performance objectives are concerned, sample delay has been very effective in damping actuator resonance. Future developments of digital control will undoubtedly result in higher sampling frequencies and the unfortunate reappearance of the actuator resonance problem.

This is why low-stall-force, longstroke actuators which are softer than higher-stall-force, shorter-stroke versions are most vulnerable. Also the advisability of minimizing grip mass is obvious. Actuator resonance is a well-known problem which has been studied in other fields. Many solutions have been proposed: piston bleed, the use of underlapped servovalves, pressure feedback etc. Two methods favoured When PlD control needs assistance 49 for materials testing are phase lag compensation and acceleration feedback.

The rate at which data are transferred is important: if the rate is too slow, important information can be lost. It is important to realize that very rapid changes in load can take place in a slow-speed tensile test such as at upper flower yield and break. The speed of data transfer may be limited by either the controller or the computer. For some applications, for example single-shot highrate testing, 'burst mode' may enable much higher data rates for a short period than the normal maximum continuous rate.

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

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