APPLICABILITY OF MIXTURE GEOMATERIAL OF LIGHTWEIGHT EMBANKMENT MATERIAL AND SILICA SAND TO SUBBASE COURSE

軟弱地盤上に構築された道路では，長期的な残留沈下が発生することがあり，その維持補修対策として下層路盤の軽量化は，この問題を解決するための代替手段である．本研究では，下水汚泥と膨張性頁岩を原料にした人工軽量盛土材の路盤材への適用性を検討するため，珪砂を混合し簡易的に粒度調整を行った3試料において，CBR試験，2種類の拘束圧及び繰返し載荷(1万回)の有無の条件で三軸試験を実施し強度・変形特性を検討した．試験結果より，混合率とCBRに一義的な傾向を示すことが明らかになった．また，繰返し載荷を与えることにより，初期剛性が増加することで最大荷重を発揮するまでの軸ひずみが小さくなり，変形係数が同程度から20%程度増加する傾向が得られた．これらの結果を踏まえ本研究では，剛性と軽量性を併せもつ適正な粒度を提案した．As roads often have a residual settlement on soft foundations, reducing the weight of the subbase course is an alternative way to solve this problem. In this study, the applicability of lightweight geo-materials made from expansive shale and sewage sludge to pavement subbase was investigated by conducting CBR tests, and triaxial tests under two types of confining pressure and with or without 10,000 cycles of cyclic loading on three samples that were simply adjusted in particle size by mixing with silica sand. The test results showed that there was a clear trend between the mixing ratio and CBR, and that under all conditions, the strength did not decrease, showing a similar trend to crushed stone, and by applying cyclic loading, the deformation modulus increased from the same level to about 20% at the maximum load equivalent axial strain level. In addition, an appropriate particle size with both stiffness and lightness was proposed.journal articl

予備知識２から始めた研究分析

application/pdf「英語論文１DAYセミナー ―英語論文を収集・執筆・発信する―」第０部「いんぱくとふぁくたー？ 予備知識０から始める研究分析」日時: 平成28年6月9日(木) 10:30-11:30会場: 室蘭工業大学 教育・研究1号館 C305スライド番号22と36について、発表後に変更・追記を行った。conference objec

Development of Skutterudite-Type Thermoelectric Materials LaxCo4Sb12 Using High-Pressure Synthesis Method

The extensive consumption of fossil fuels and other energy resources worldwide necessitates the exploration of alternative energy sources. Thermoelectric power generation is one of the most prominent technologies to convert heat energy into electrical energy. Numerous researchers have devoted significant efforts to enhancing the efficiency of thermoelectric technology through the synthesis of nanomaterials using various methodologies. Among these methods, high-pressure synthesis emerges as one of the most efficient techniques for synthesizing thermoelectric materials. In this study, we fabricated skutterudite-type thermoelectric materials of LaxCo4Sb12 by using a high-pressure synthesis method with a high filling rate, where the actual filling fraction can increase up to x = 0.28, exceeding the theoretical filling limit at ambient pressure. As a result, the LaxCo4Sb12 shows a significantly lower lattice thermal conductivity value of 1.3 W/mK which is much lower thermal conductivity value than CoSb3. The results clearly demonstrate that the high-pressure synthesis method is a promising tool for enhancing the performance of thermoelectric materials.journal articl

Drop-weight impact loading tests of cushion rubber set AFRP sheet strengthened RC beams reaching ultimate state with sheet failure in case of varying rubber thickness

The impact resistant capacity of the reinforced concrete (RC) beams may be increased by flattening the high intensity impact force. In this paper, the impact resistant behavior of the cushion rubber set AFRP-sheet strengthened RC beams which reach ultimate state with sheet failure was investigated conducting drop-weight impact test loading with varying thickness of the cushion rubber. The results obtained from this study were as follows: the primary peak impact force can be decreased by less than approximately one-fifth; however, dynamic behavior of the beams may be similar irrespective of with/without setting the cushion rubber because of similarity of those impulses; and sheet fracture can be effectively restrained by setting the cushion rubber in the case of increasing input impact energy.journal articl