长江科学院院报
長江科學院院報
장강과학원원보
Journal of Yangtze River Scientific Research Institute
2015年
10期
116-120
,共5页
刘璐璐%常芳芳%解伟%王雪奎
劉璐璐%常芳芳%解偉%王雪奎
류로로%상방방%해위%왕설규
塑性混凝土%循环加载%弹性模量%应力-应变曲线%峰值应力
塑性混凝土%循環加載%彈性模量%應力-應變麯線%峰值應力
소성혼응토%순배가재%탄성모량%응력-응변곡선%봉치응력
plastic concrete%cyclic loading%elastic modulus%stress-strain curve%peak stress
通过设置4组配合比浇筑圆柱体和棱柱体试件,进行了抗压强度和弹性模量试验。试验分析了应力-应变曲线、预压段和未预压段以及循环段的应力-应变曲线的特点,比较了预压段与未预压段的应力-应变曲线。通过对曲线斜率的分析,了解试件孔隙存在的微观性,明确预压时循环次数对应力-应变曲线的影响。试验结果表明:塑性混凝土应力-应变曲线的上升段较普通混凝土有明显的不同,预压段的应力-应变曲线的斜率先增加后减小,而未预压段的曲线斜率一直增加。同时,可以宏观地明白试件内部孔隙存在的微观性,得出预压次数对应力-应变曲线的影响并不大。所得出的结论对塑性混凝土今后的科学研究与工程应用具有一定的借鉴。
通過設置4組配閤比澆築圓柱體和稜柱體試件,進行瞭抗壓彊度和彈性模量試驗。試驗分析瞭應力-應變麯線、預壓段和未預壓段以及循環段的應力-應變麯線的特點,比較瞭預壓段與未預壓段的應力-應變麯線。通過對麯線斜率的分析,瞭解試件孔隙存在的微觀性,明確預壓時循環次數對應力-應變麯線的影響。試驗結果錶明:塑性混凝土應力-應變麯線的上升段較普通混凝土有明顯的不同,預壓段的應力-應變麯線的斜率先增加後減小,而未預壓段的麯線斜率一直增加。同時,可以宏觀地明白試件內部孔隙存在的微觀性,得齣預壓次數對應力-應變麯線的影響併不大。所得齣的結論對塑性混凝土今後的科學研究與工程應用具有一定的藉鑒。
통과설치4조배합비요축원주체화릉주체시건,진행료항압강도화탄성모량시험。시험분석료응력-응변곡선、예압단화미예압단이급순배단적응력-응변곡선적특점,비교료예압단여미예압단적응력-응변곡선。통과대곡선사솔적분석,료해시건공극존재적미관성,명학예압시순배차수대응력-응변곡선적영향。시험결과표명:소성혼응토응력-응변곡선적상승단교보통혼응토유명현적불동,예압단적응력-응변곡선적사솔선증가후감소,이미예압단적곡선사솔일직증가。동시,가이굉관지명백시건내부공극존재적미관성,득출예압차수대응력-응변곡선적영향병불대。소득출적결론대소성혼응토금후적과학연구여공정응용구유일정적차감。
Previous researches on the stress-strain curve of plastic concrete are focused on the curve in the absence of preloading.In this paper,compressive strength and elastic modulus tests were conducted on cylinder and pris-moid concrete specimens poured with different mix proportions.The characteristics of the stress-strain curve,the stress-strain curves in the presence of preloading and in the absence of preloading and under cyclic loading were re-spectively analyzed.Moreover,the stress-strain curves with preloading and no preloading were compared.Through analysis on the slope of the curves,micropores were proved to exist in the concrete,and how the number of cycles during preloading affecting the curves was obtained.The results show that the rise stage of stress-strain curves of plastic concrete is significantly different from that of normal concrete,and the slope of stress-strain curves of pre-loading stage firstly increases then decreases,whereas the slope of stress-strain curves always increases at none-pre-loading stage.At the same time,we can macroscopically understand the existence of inner micro pores in the speci-mens,and the number of preloading cycles has a little effect on stress-strain curves.The results show that the rise of stress-strain curves of plastic concrete is significantly different than those of normal,the slope of stress-strain curves of preloading firstly increases then decreases,and the slope of stress-strain curves of no preloading has been in-creased.At the same time,we can understand the macro of the specimens,and number of preloading has no effect on stress-strain curves.The results have reference significance to the scientific and engineering applications.The re-sults can be referenced for the scientific research and engineering applications of plastic concrete.