大型氢氧化铝稀相流态化焙烧炉用高温耐磨浇注料的研制

针对大型气态悬浮焙烧炉主炉、辅炉用耐磨浇注料,以电熔棕刚玉(5~8mm、3~5mm、≤0.074mm)、特级矾土(1~3mm、≤1mm)、SiO2微粉、α-Al2O3微粉、CA-80水泥为主要原料,主要对SiO2微粉、α-Al2O3微粉和CA-80水泥的加入量进行了试验。结果表明通过优化SiO2微粉、α-Al2O3微粉和CA-80水泥的加入量,研制出了体积密度、线变化率、耐压强度、抗折强度、抗热震性以及耐磨性能均好于国外同类型的大型气态悬浮焙烧炉用高温耐磨浇注料,并且成本上仅比国外同类型高7.4%,可以在生产上推广使用。     

Experimental investigation of bond-slip behavior of aluminum plates adhesively bonded to concrete

The main objective of this investigation is to assess the feasibility of using aluminum alloy (AA) plates as externally bonded strengthening material for reinforced concrete members. Consequently, the main aim of this paper is to experimentally investigate the bond stress-slip behavior of AA plates adhesively bonded to concrete surface. In addition, the effect of different AA surface roughness on the bond stress and bond behavior of AA-concrete interface was also investigated. Twelve specimens with six different surface roughnesses were instrumented and tested under single shear. The tested specimens have two bonded lengths – long bonded lengths (75% of prism length) and short bonded length (30% of prism length). It was observed that the bond shear stress, loading capacity, and failure modes vary with AA surface roughness and bonded length. The load capacity and maximum bond stress increased by 143.6 and 342.6%, respectively, for long bonded length (75%) of randomly grinded AA surface compared with those of normal AA surface. Such increase in load capacity and bond stress demonstrated the potential of using AA as externally bonded strengthening material. In addition, the bond-slip behavior of the AA plates was predicted, with reasonable level of accuracy, using existing bond-slip models that were originally developed for fiber-reinforced polymer materials. However, a more elaborate study is warranted to develop bond stress-slip models, specifically, for AA-concrete interface.