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General Specifications for Concrete Bridges (Classic Reprint)
Wilbur Jay Watson
Попередній перегляд недоступний - 2017
28 days abutments adhesion allowable unit stress angle angle of repose Appendix arch ring asphalt assumed average low water back fill beams and girders bending blocks brick cast stone Class coat compressive stress computed Concrete Footings concrete piles considered contract Contractor crete cubic foot day in moist days 1 day diameter Earth Fill elastic limit Electric Railway Engineer equal exceed feet finish flange grade gravel inch thick laid less massive concrete materials Modulus of elasticity moist air mortar natural cement neat cement neutral axis NUMBER Owner partially continuous Piers Portland cement Pozzulan preferably pressure proportions Railway tracks reinforced concrete reinforcing bars resist retaining wall shearing stresses simple beams slab slag concrete soooo span Specific Gravity specified live load square foot square inch stirrups stresses on concrete subgrade surface tensile strength tensile stresses tests timber unless otherwise vertical waterproofing weight width
Сторінка 49 - It is further mutually agreed between the parties hereto that no certificate given or payment made under this contract, except the final certificate or final payment, shall be conclusive evidence of the performance of this contract, either wholly or in part, and that no payment shall be construed to be an acceptance of defective work or improper materials.
Сторінка 56 - ... constancy of volume are divided into two classes, the first normal, the second accelerated. The latter should be regarded as a precautionary test only, and not infallible. So many conditions enter into the making and interpreting of it that it should be used with extreme care.
Сторінка 57 - The cement shall be stored in such a manner as to permit easy access for proper inspection and identification of each shipment, and in a suitable weather-tight building which will protect the cement from dampness.
Сторінка 60 - Pats of neat cement about three inches in diameter, one-half inch thick at the center, and tapering to a thin edge, shall be kept in moist air for a period of twenty-four hours.
Сторінка 55 - Great care should be exercised to maintain the test pieces under as uniform conditions as possible. A sudden change or wide range of temperature in the room in which the tests are made, a very dry or humid atmosphere, and other irregularities vitally affect the rate of setting.
Сторінка 47 - Should the Contractor at any time refuse or neglect to supply a sufficiency of properly skilled workmen, or of materials of the proper quality, or fail in any respect to prosecute the work with promptness and diligence, or fail in the performance of any of the agreements herein contained, such refusal, neglect or failure being certified by the architects, the Owner shall be at liberty, after three days...
Сторінка 56 - Failure to meet the requirements at this time should be considered sufficient cause for rejection, although in the present state of our knowledge it cannot be said that such failure necessarily indicates unsoundness, nor can the cement be considered entirely satisfactory simply because it passes the tests.
Сторінка 60 - A third pat is exposed in any convenient way in an atmosphere of steam, above boiling water, in a loosely closed vessel for five hours.
Сторінка 47 - Owner shall be at liberty, after three days written notice to the Contractor , to provide any such labor or materials, and to deduct the cost thereof from any money then due or thereafter to become due to the Contractor under this contract ; and if the...