GB/T 21839-2019预应力混凝土用钢材等温松弛试验：在20℃士2℃ 温度下，将试样保持一定长度(L0+△L0),从初始力F0开始，测定试样上力的变化，长度引伸计标距1000mm，应力松弛试验周期120h～1000h。钢材等温松弛试验初始试验力、初始试验力保持、零时间保持初始总应变、标距恒定、连续记录试验力和温度、定时记录试验力和温度、监测初始总应变和标距、松弛率、松弛特性曲线(剩余试验力-温度、力-松弛率、力-位移变形)。HRJ Tester；松弛试验过程由三个温度采集器精准温度采集、实时跟随。GB/T 21839-2019适用于预应力钢丝、预应力钢棒、预应力钢筋、预应力钢绞线等产品相关性能的测定。
GB/T 21839-2019规定了预应力混凝土用钢材的拉伸、弯曲、反复弯曲、扭转、缠绕和镀层附着力、等温松弛、轴向力疲劳、硫氰酸盐溶液中的应力腐蚀、偏斜拉伸、每米公称质量偏差的确定、镀层均匀性、锌层质量等试验方法。HRJ Tester；等温应力松弛试验(最大应力、初始力、损失力、原始标距1000mm/钢绞线捻距倍数、20% ～80%0～100% F0连续加载、匀速率加载、多个均匀阶段、保持恒定、应变保持、应变变化、力值记录频率、测力分辨率、引伸计分辨率)；
300kN/500kN/600kN/1000kN钢材等温松弛试验机；300kN～1000kN应力松弛试验机；1000h拉伸应力松弛试验机；300kN～1000kN钢绞线等温松弛试验机；HRJ Tester；300kN～1000kN钢棒等温松弛试验机；1000h钢绞线松弛试验机；1000h钢丝钢筋松弛试验机；300kN～1000kN钢材应力腐蚀试验机；CRB冷轧带肋钢筋松弛试验机；PSB螺纹钢筋松弛试验机；300kN～1000kN钢材高温松弛试验机；300kN～1000kN腐蚀松弛试验机；600kN/1000kN钢绞线偏斜拉伸试验机；ISO 15630-3；ISO 6934-3；ISO 6934-4；ISO 14655；AS NZS 4672.2；ASTM E328-2013；ASTM A416/A416M-2012a；HRJ Tester；ASTM A882/A882M；BS 5896-2012；JIS G3536；JIS Z2276-2012；JIS G3137；EN 10391；GB/T10120-2013；GB/T5224-2014；GB/T5223-2014；GB/T5223.3-2017；GB/T13788-2017；GB/T20065-2016；HRJ Tester；GB/T30828-2014；GB/T3428-2012；GB/T31314-2014；GB/T31304-2014；GB/T30826-2014；GB/T33026-2017；GB/T25823-2010；GB/T33363-2016；GB/T16825.1；
Prestressing Concrete Steel Relaxation Tester；Test methods of steel for prestressing concrete；Steel Tensile Stress Relaxation Tester；1000h Tensile stress Relaxation Test；Steel strand Stress Relaxation Tester；HRJ Tester；Steel wires bars Stress Relaxation Tester；Metallic materials Tensile stress relaxation-Method of test；Steel wire for prestressing of concrete；Steel bars prestressed concrete； Screw-thread steel bars for the prestressing of concrete；Middle strength steel wire for prestressed concrete；jnshiyanji.net；Many high strength of large diameter wire low relaxation prestressed strands；Epoxy-coated high strength wire stay cable；Technical conditions for steel strand cable of cable stayed bridge；HRJ Tester；High strength steel wire strand for building structures； Individual epoxy-coated wire prestressing steel strand；Hot-dip galvanized steel strand for prestress；Steel for the reinforcement and prestressing of concrete-Test methods；Tensile stress relaxation Test procedure；Standard Test Methods for Stress Relaxation Tests for Materials and Structures；Standard Specification for Filled Epoxy-Coated Seven-Wire Prestressing Steel Strand；High tensile steel wire and strand for the prestressing of concrete Specification；Small diameter steel bars for prestressed concrete；jnshiyanji.net；Method of tensile stress relaxation test for metallic materials；Steel prestressing materials-Testing requirements；High Temperature Stress Relaxation Tester；Steel Strand Stress Corrosion Relaxation Tester；Steel strand Skew Tensile Tester； |
