For the 150mm hollow clay vertical cell unit, the most common type is HBS. Select one: True False The standard for hollow clay vertical cell units is ASTM C651. Select one: True False
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- Civil Read properly Q- Membersof the ACI Building Code committee conducted a study, and the results showed that the scatter in the modulus of elasticity did not support the use of a different or "more precise" formulation. As a result, the equation (Eci) can be applied generally. Calculations should be based on project mixture design test results if a project calls for a more exact estimation of the modulus of elasticity. Where f 0 ci is the strength of the concrete at the moment of transfer in psi and wc is the unit weight of the concrete in pcf, which is often taken to be 160 pcf for precast concrete and 150 pcf for cast-in-place concrete. Members with post-tension tensioning sequence affects elastic shortening in post-tensioned members. Tendons may be stressed to a maximum of 0.80 fpu, however the stress in the tendon right after seating must be 0.70 fpu or less. Calculate the fES for elastic shortening losses.(i) A 10-mm-diameter Brinell hardness indenter produced an indentation 2.50 mm in diameter in a steel alloy when a load of 1000 kg was used. Compute the HB of this material. (ii) What will be the diameter of an indentation to yield a hardness of 300 HB when a 500-kg load is used?Show solution please use ASD
- A high-density polyethelene (HDPE) [E = 780 MPa; V = 0.46] rod has a diameter of 80 mm before load P is applied. In order to maintain certain clearances, the diameter of the rod must not exceed 81 mm when loaded. What is the largest permissible compressive load P that can be applied to the HDPE rod?(a) In general, which provides better fire performance, carbonate or silicate aggregates? Why? (b) Why does fire design incorporate a load reduction factor (Dfire) = 1.0? (c) Two identical beams (Beam 1 is simply supported, and Beam 2 is fully restrained) are heated under similar conditions. What does the mechanical strain equal to in each of these beams? (d) A design office located in Clemson, SC (with a branch in San Francisco, CA) envisions designing a new composite member made of steel and timber. This to-be designed member is expected to be used in wildfire-prone regions primarily for single family homes. Comment on how you would design such a member to achieve superior fire performance. (e) Plot and discuss the expected degradation faces in three bending elements (say, beams) to be made from concrete, steel and timber?Hardness 6.54 (a) A 10-mm-diameter Brinell hardness indenter O produced an indentation 2.50 mm in diameter in a steel alloy when a load of 1000 kg was used. Compute the HB of this material. (b) What will be the diameter of an indentation to yield a hardness of 300 HB when a 500-kg load is used?