نتایج جستجو برای: specified strength
تعداد نتایج: 269905 فیلتر نتایج به سال:
Recycled concrete aggregates (RCA) are used in new concrete mixes, termed recycled aggregate concrete (RAC). Among losses in most fresh and hardened properties, literature reports that RAC suffers increased levels of drying shrinkage compared to equivalent mixes incorporating conventional aggregates. This paper describes the procedure and results of a range of experiments conducted on a commerc...
Background: RPE scale can be used for self-assessing worker’s abilities in the workplace. When participants perform a task which transcends their ability, or the grip strength is not appropriate, they experience muscular tension and fatigue. Hand grip is a factor used for preventing muscular skeletal disorders in the upper limb. This study aimed to evaluate the relation between RPE and handgrip...
This paper presents the results of a fundamental study to expand the applicability of the current AASHTO LRFD Bridge Design Specifications for concrete strength up to 18 ksi for reinforced and prestressed concrete members in flexure and compression. A total of 321 specimens were tested to determine the material properties of three high-strength concrete mixtures having target compressive concre...
PBXN-111 is a common plastic bonded explosive has been widely used in warhead section of several navy weapons. This charge is based on HTPB resin and prepared with cast-cure method. Isodecyl pelargonate (IDP) as plasticizer is used in PBXN-111 formulation. Considering limitations to prepare IDP, in this research the effect of replacement of dioctyl adipate (DOA) and dioctyl sebacate (DOS) inste...
Abstract: mechanical properties of AISIH 13 hot-work tool steel have been studied. Cast samples made of the modified new steel were homogenized and austenitized at different conditions, followed by tempering at the specified temperature ranges. Hardness, red hardness, three point bending test and Charpy impact test were carried out to evaluate the mechanical properties together with characteriz...
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