BUILDING UP STRENGTH

Helmoed-Roemer Heitman

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BUILDING UP STRENGTH

机译：加强实力

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The South African defence industry is beginning to find its feet again following severe budget cuts over the last 20 years.rnThe South African defence industry evolved from assembling light armoured cars and jet trainers in the late 1960s to developing world-class armour and artillery, guided weapons, the Rooivalk attack helicopter, reconnaissance satellites and boosters and nuclear weapons by the end of the 1980s. At its peak the industry comprised some 1,100 companies employing more than 80,000 people.

机译：在过去的20年中，预算大幅削减，南非国防工业开始重新站稳脚跟。rn南非国防工业从1960年代后期组装轻型装甲车和喷气教练机发展到发展世界一流的装甲和火炮，武器，Rooivalk攻击直升机，侦察卫星，助推器和核武器，到1980年代末。该行业的鼎盛时期包括约1,100家公司，雇员超过80,000。

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《Jane's Defence Weekly》 |2007年第49期|22-2628-29|共7页
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Helmoed-Roemer Heitman;
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7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

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