土木专业英语摘要翻译.doc

专业英语摘要翻译课程作业 专业： 年级： 姓名： 学号： *大学土木工程学院 2015 年 6 月Preparation of C200 green reactive powder concrete and its static-dynamic behaviorsC200绿色活性粉末混凝土的制备和它的静力、动力性能的研究AbstractIn this paper, a new type of green reactive powder concrete (GRPC) with compressive strength of 200 MPa(C200 GRPC) is prepared by utilizing composite mineral admixtures, natural fine aggregates, short and fine steel fibers. The quasi-static mechanical properties (mechanical strength, fracture energy and fibermatrix interfacial bonding strength) of GRPC specimens, cured in three different types of regimes(standard curing, steam curing and autoclave curing), are investigated. The experimental results show that the mechanical properties of the C200 GRPC made with the cementitious materials consisting of 40% of Portland cement, 25% of ultra fine slag, 25% of ultra fine fly ash and 10% of silica fume, 4% volume fraction of steel fiber are higher than the others. The corresponding compressive strength, flexural strength, fracture energy and fibermatrix interfacial bonding strength are more than 200 MPa,60 MPa, 30,000 J/m2 and 14 MPa, respectively. The dynamic tensile behavior of the C200 GRPC is also investigated through the Split Hopkinson Pressure Bar (SHPB) according to the spalling phenomena.The dynamic testing results demonstrate that strain rate has an important effect on the dynamic tensile behavior of C200 GRPC. With an increase of strain rate, the peak stress rapidly increases in the dynamic tensile stresstime curves. The C200 GRPC exhibits an obvious strain rate stiffening effect in the case of high strain rate. Finally, the mechanism of excellent static and dynamic properties gains of C200 GRPC is also discussed.摘要：本文，使用合成矿物外加剂、天然细骨料、短细钢纤维制备了一种抗压强度200MPa的绿色活性粉末混凝土（GRPC）。研究了GRPC样本在三种不同养护制度下（标准养护、蒸汽养护、蒸压养护）的拟静力性能（力学强度、断裂能力和纤维矩阵界面粘合强度）。实验结果表明由胶结材料（包括40%波特兰水泥、25%超细炉渣、25%超细飞灰和10%硅粉、4%容积率的钢纤维）制成的C200 GRPC的力学性能比其它的高。相应的抗压强度超过200MPa，抗弯强度超过60MPa，断裂能力超过30000J/m2，纤维矩阵界面粘合强度超过14MPa。根据剥落现象,通过分离式霍普金森压杆研究了C200 GRPC的动力抗拉性能。动力测试结果表明应变率对C200 GRPC相应的动力抗拉性能有重要影响。在动力抗拉应力-时间曲线上，随应变率提高，峰值应力很快提高。在高应变率情况下，C200 GRPC展示了明显的应变率硬化效果。最后，本文也讨论了C200 GRPC良好的静力和动力性能增加机理。Influence of aggregate and curing regime on the mechanical properties of ultra-high performance fibre reinforced concrete (UHPFRC)骨料和养护制度对超高性能纤维加固混凝土力学性能影响的研究AbstractA new generation of concrete, ultra-high performance fibre reinforced concrete (UHPFRC) has been developed for its outstanding mechanical performance and shows a very promising future in construction applications. In this paper, several possibilities are examined for reducing the price of producing UHPFRCand for bringing UHPFRC away from solely precast applications and onto the construction site as an in situ material. Recycled glass cullet and two types of local natural sand were examined as replacement materials for the more expensive silica sand normally used to produce UHPFRC. In addition, curing of UHPFRC cubes and prisms at 20 oC and 90 oC has been investigated to determine differences in both mechanical and ductility.The results showed that using more angular sand particles reduces the flowability of fresh UHPFRC. The local natural sand can produce a similar mechanical and ductility of UHPFRC to the silica sand. However,the use of Recycled Glass Cullet (RGC) gives approximately 15% lower performance, i.e. flexural strength,compressive strength and fracture energy. Specimens cured at 20 oC give approximately 20% lower compressive strength, 10% lower flexural strength and 15% lower fracture energy than specimens cured at 90 oC from 1 to 7 days.摘要： 作为一种新的混凝土，超高性能纤维加固混凝土（UHPFRC）由于突出的力学性能而被发展，在施工应用方面有很大的潜力。本文验证了降低UHPFRC的成本，把UHPFRC从单独预制应用转移到施工场地作为原产地材料的可能性。再生玻璃和两种天然砂代替了更昂贵、通常用来生产UHPFRC的石英砂。此外，研究了UHPFRC立方体和棱柱体在20摄氏度和90摄氏度的养护来确定力学和延性差异。 研究表明使用更多砾砂减少了UHPFRC的流动性。比起石英砂，天然砂可以使UHPFRC产生相似的力学和延性。然而，再生玻璃的使用大约降低了15%的性能，包括抗弯强度、抗压强度和断裂能力。1到7天强度，比起90摄氏度养护下的样本，20摄氏度养护下的样本大约降低20%抗压强度，10%抗弯强度和15%的断裂能力。Effects of w/c ratio and curing conditions on strength development inBRECEM concretes水灰比和养护制度对BRECEM混凝土强度发展的影响的研究AbstractThe early strength development of BRECEM concretes, made from 50:50 mixtures of calcium aluminate cement (CAC) and ground granulated blastfurnace slag (ggbs), using 100-mm cubes at w/c ratios of 0.35 and 0.45, has been studied. BRECEM concretes showed good strength development at both w/c ratios whether water cured or air cured. In contrast, longer-term studies with 1-m cubes cured under near-adiabatic conditions have indicated that mass BRECEM concretes of similar binder composition may gain compressive strength relatively slowly. This is primarily due to the heat of hydration of the CAC component, which can lead to temperatures of up to 60 oC, resulting in rapid hydration and conversion of the calcium aluminate component. However, the performance of 40 CAC/60 ggbs concrete under these near-adiabatic conditions has proved to be satisfactory over a period of 5 years, with similar strength development to that of equivalent 100-mm cubes stored under ambient conditions. 摘要：本文研究了BRECEM混凝土100mm立方体试块的早期强度发展，混凝土用50比50的铝酸钙