为了研究硬化阶段混凝土表面性能受环境影响而变化的特性,利用冲击球压技术研究了非常规养护制度下(室外、水中及5%Na2SO4溶液)混凝土的冲击荷载与压痕尺寸的关系、动态硬度及恢复系数,对混凝土材料的冲击压痕形貌进行了分析.结果表明:(1)水中养护的混凝土动态硬度和恢复系数较大,随着养护时间的延续增长最快;自然环境中放置的混凝土动态硬度和恢复系数最小,硬化初期这两项性能有一定的增长,但是在硬化中后期发生下降;(2)5%Na2SO4溶液中养护的混凝土硬化初期动态硬度和恢复系数较大,随养护时间的延续动态硬度缓慢增长,而恢复系数明显下降;整个试验证明,利用冲击球压技术评价混凝土的硬化程度是可行的.
参考文献
| [1] | Oka Y I;Matsummura M;Funaki H .Measurements of plastic strain below an indentation and piling-up between two adjacent indentations[J].Wear,1995,186-187:50-55. |
| [2] | Wiederhorn S M;Lawn B R .Strength degradation of glass resulting from impact with spheres[J].Journal of the American Ceramic Society,1977,9-10:451-458. |
| [3] | Chen X.;Hutchinson JW. .Particle impact on metal substrates with application to foreign object damage to aircraft engines[J].Journal of the Mechanics and Physics of Solids,2002(12):2669-2690. |
| [4] | 陈志诚 .混凝土的接触损伤及球压法无损评价研究[D].北京:中国建筑材料科学研究院,2001. |
| [5] | Momber A W .Damage to rocks and cementitious materials form solid impact[J].Rock Mechanics and Rock Engineering,2004,37,1:57-82. |
| [6] | Forrestal MJ.;Tzou DY. .A SPHERICAL CAVITY-EXPANSION PENETRATION MODEL FOR CONCRETE TARGETS[J].International Journal of Solids and Structures,1997(31/32):4127-4146. |
| [7] | Iyer K A .Relationships between multiaxial stress states and internal fracture pattern in sphere-impaced silicon carbide[J].International Journal of Fracture,2007,146:1-18. |
| [8] | A. Franco Jr.;S. G. Roberts .Surface mechanical analyses by Hertzian indentation[J].Ceramic,2004(314):94-108. |
| [9] | G. Gilardi;I. Sharf .Literature survey of contact dynamics modelling[J].Mechanism and Machine Theory: Dynamics of Machine Systems Gears and Power Trandmissions Robots and Manipulator Systems Computer-Aided Design Methods,2002(10):1213-1239. |
| [10] | Wu C Y;Li L Y;Thornton C .Rebound behaviour of sphere for plastic impacts[J].International Journal of Impact Engineering,2003,28:929-946. |
| [11] | Tabor D .A Simple theory of static and dynamic hardness[J].The Royal Society,1948,192:247-274. |
| [12] | Kohlhofer W;Penny R K .Dynamic hardness testing of metals[J].International Journal of Pressure Vessels and Piping,1995,61:65-75. |
| [13] | Hussainova I;Kübarsepp J;Shcheglov I .Investigation of impact of solid particles against hardmetal and cermet targets[J].Tribology,1999,32:337-344. |
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