粉胶比及砂胶比对ECC力学性能的影响  

Effect of powder ratio and sand to glue ratio on mechanical properties of ECC

作　　者：邓朗妮[1] 郝世纪 杨洲 雷丽贞 廖羚[1] DENG Langni;HAO Shiji;YANG Zhou;LEI Lizhen;LIAO Ling(Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学,广西柳州545006

出　　处：《混凝土》2024年第11期8-13,18,共7页Concrete

基　　金：国家自然科学基金委员会地区科学基金项目“基于智能复合材料加固的桥梁疲劳寿命估计及时变可靠性研究”(51568008);广西科技计划重大专项项目“超千米级悬索桥缆索体系制造与智能施工装备关键技术研究及产业化”(桂科AA22068066);广西重点研发计划项目“基于BIM技术的装配式部件智能化设计技术研发及应用”(2023AB01364);中央引导地方科技发展资金专项-自由探索类基础研究“智能碳纤维拉索索力时程感知与疲劳寿命评估方法研究”(2023JRZ0101);柳州市科技计划重大专项项目“大吨位智能碳纤维复合材料拉索研发”(2022AAC0102);广西科技大学研究生教育创新计划项目“FRP网格-ECC复合加固损伤钢筋混凝土梁抗弯性能研究”(GKYC202330)。

摘　　要：为研究粉胶比及砂胶比对工程水泥基复合材料(ECC)力学性能的影响,使用不同的粉胶比及砂胶比制成的ECC立方体试件和哑铃型试件进行立方体抗压试验和单轴拉伸试验,并运用能量比值法表示ECC的韧性指数。试验结果表明:ECC在轴向压缩、拉伸荷载作用下呈现出多点开裂模式,表现出明显的延性破坏特点。随着粉胶比的增大,ECC的抗压、抗拉强度明显降低;粉胶比的增大能有效改善ECC的抗裂能力,提高ECC的抗压韧性,使其具备良好的能量吸收效果,抗拉韧性呈现先增加后降低的趋势;增大砂胶比也会降低ECC的抗压、抗拉强度,但会使ECC的延性和韧性先增加后降低。当砂胶比为0.4、粉胶比为0.6时,ECC的韧性达到最佳。In order to research the effects of powder ratio and sand to gel ratio on the mechanical properties of ECC,cubic compressive tests and uniaxial tensile tests were carried out on ECC cubic specimens and dumbbell type specimens made with different powder ratio and sand to gel ratio,and the energy ratio method was applied to express the ductility index of ECC.The test results showed that ECC showed a multi-point cracking pattern under axial compression and tensile loading,and exhibited obvious ductile damage characteristics.With the increase of powder ratio,the compressive and tensile strength of ECC decreases significantly.The increase of powder ratio can effectively improve the cracking resistance of ECC and increase the compressive toughness of ECC,making it have a good energy absorption effect,the tensile toughness shows a tendency to increase first and then decrease.Increasing the sand to glue ratio also reduces the compressive and tensile strength of ECC,but will increase the ductility and toughness of ECC first and then decrease.The toughness of ECC reaches the optimum level when the sand to glue ratio is 0.4 and the powder ratio is 0.6.

关 键 词：工程水泥基复合材料 粉胶比 砂胶比 韧性评价 

分 类 号：TU528.062[建筑科学—建筑技术科学]