New PDF release: ACI 301-10: Specifications for Structural Concrete

By ACI Committee 301

ISBN-10: 0870314033

ISBN-13: 9780870314032

ACI 301 covers common development specifications for cast-in-place structural concrete and slabs-on-ground. the 1st 5 sections hide 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, assessment, and attractiveness of concrete in addition to popularity of the constructions are integrated. the rest sections are dedicated to architectural concrete, light-weight concrete, mass concrete, posttensioned concrete, shrinkage-compensating concrete, business flooring slabs, tilt-up development, precast structural concrete, and precast architectural concrete.

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2008). indb 25 8/9/2012 7:31:38 PM Figure 10 shows a typical cross-section of precast reinforced concrete tunnel lining for Metro Line 2. , 1999). 35 m, respectively. 2 0m Standpipe piezometer Rod extensometers Soft clay/silt clay 40 m 50 m Aquifer Silty clay 80 m Aquifer 110 m 120 m Stiff clay Instrumentation Aquifer 160 m Various instruments were installed to monitor groundwater pressures, surface, subsurface and tunnel settlements. Figure 11(a) shows the layout of instrumentation adopted in this study.

Extraordinary event, tunnel flooding: between 4 and 5 February 2010 • Start of rain season: June 2010 Figure 17. Measurements made at the tunnel after 8 months of construction: (a) plan location, (b) injection pressures and volume, (c) horizontal convergence and (d) vertical convergence. indb 17 8/9/2012 7:31:31 PM Figure 18. Convergence measured at voussoir ring 37: (a) time vs horizontal convergence diagram, (b) time vs deformation speed diagram. by means of the SPAC geophysical technique, the use of a presiometer, phicometer, triple barrel samplers, etc.

The failure mechanisms analyzed were: depth, lateral extrusion, sub-pressure, flotation, kicking, excavation advance without support. Ultimate states include: a. Soil fracturing and slurry losses. During the excavation of the annular trench, some incidents have been reported such as fluid losses or fracturing of the soil due to slurry pressure. In Mexico City soft clays, fracturing may appear when the slurry level is raised only one meter above the water table level. The construction of a concentric plastic concrete annular wall is helpful to prevent fracturing.

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


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