地质聚合物混凝土动态劈裂拉伸破坏的吸能特性  

Energy Absorption Capacities of Geopolymer Concrete under Condition of Dynamic Splitting-tensile Damage

作　　者：许金余[1] 罗鑫[1] 吴菲[1] 白二雷[1] 高志刚[1] 

机构地区：[1]空军工程大学机场建筑工程系,陕西西安710038

出　　处：《空军工程大学学报（自然科学版）》2013年第5期85-88,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51208507;51078350);陕西省自然科学基金资助项目(2011GM6014)

摘　　要：以矿渣、粉煤灰为原材料,以NaOH(NH)、Na2CO3(NC)为碱激发剂,制备了C30高流态地质聚合物混凝土GC,并采用经波形整形技术改进后的Φ100mm SHPB试验装置开展了GC的动态劈裂拉伸试验,从入射能量平均变化率、能量的吸收、动态破坏形态间的内在关系入手分析了GC的吸能特性。结果表明:GC的入射波、反射波和透射波能量及吸收的能量随入射能量平均变化率的增加而增大,但增大速率逐渐变缓,总体规律可用二次多项式关系来表示;随着入射能量平均变化率的增加,试件的破坏程度也越加严重,加载端的类似三角形的粉碎性区域的面积也越大,且试样与入射杆接触端面的粉碎区域要大于与透射杆接触端面的粉碎区域;GC与普通硅酸盐水泥混凝土OPCC均存在入射能量变化率效应,但OPCC吸收的能量的增大速率随入射能量平均变化率的增加几乎保持不变,总体规律可由线性关系来表示。Slag and fly ash are used in the fabrication of GC,and NaOH and Na2CO3are used for slag and fly ash activation,then highly fluidized C30Geopolymer Concrete(GC)is prepared.Φ100mm SHPB apparatus is improved by using the pulse shaper technique,based on this,dynamic splitting-tensile tests are made,and the energy properties of GC under impact loading are analyzed.The results indicate that the incident pulse,reflected pulse,transmitted pulse energy and the energy absorption are increased with the rising of average incident pulse energy rate,but the increasing rate will gradually decay,the general law can be described as quadratic polynomial relationship.With the rising of average incident pulse energy rate,the damage level of specimen will be more serious and the comminuted area shaped like an triangle on the loading end will become larger,moreover,the comminuted area close to the incident bar is greater than that close to the reflected bar.GC and ordinary Portland cement concrete(OPCC)exhibit incident pulse energy rate dependency,but the increasing rate of energy absorption of OPCC almost keeps constant with the rising of average incident pulse energy rate,and the general law can be described as linear relationship.

关 键 词：地质聚合物 霍普金森压杆 动态劈裂拉伸试验 吸能特性 波形整形技术 

分 类 号：O347[理学—固体力学] TU528.572[理学—力学]