CAJ | 학술논문

超高韧性水泥基复合材料（Ultra High Toughness Cementitious Composites， UHTCC）是一种具有良好变形性能、裂缝控制能力和耐久性能的新型水泥基复合材料，特别适用于大坝、灌渠等水工结构的加固和修补。然而现有UHTCC材料在喷射施工过程中存在难泵送、易堵管和与结构面粘结性能差等问题，难以实现大面积快速施工，制约了该材料在实际工程中的推广和应用。本文研制出了一种可连续喷射、回弹率低的UHTCC材料，同时保证了喷射过程中纤维的均匀分散，材料硬化后仍具备拉伸应变硬化和多缝开裂特征。喷射UHTCC的压缩性能、直接拉伸性能和抗折性能试验结果显示，该材料28 d龄期抗折强度为10.30 MPa，拉伸强度为2.33 MPa，拉伸应变稳定在1.5%以上，具有延性破坏特征和良好的控裂性能，其性能可满足一般水工结构的表面加固和修补要求。
초고인성수니기복합재료（Ultra High Toughness Cementitious Composites， UHTCC）시일충구유량호변형성능、렬봉공제능력화내구성능적신형수니기복합재료，특별괄용우대패、관거등수공결구적가고화수보。연이현유UHTCC재료재분사시공과정중존재난빙송、역도관화여결구면점결성능차등문제，난이실현대면적쾌속시공，제약료해재료재실제공정중적추엄화응용。본문연제출료일충가련속분사、회탄솔저적UHTCC재료，동시보증료분사과정중섬유적균균분산，재료경화후잉구비랍신응변경화화다봉개렬특정。분사UHTCC적압축성능、직접랍신성능화항절성능시험결과현시，해재료28 d령기항절강도위10.30 MPa，랍신강도위2.33 MPa，랍신응변은정재1.5%이상，구유연성파배특정화량호적공렬성능，기성능가만족일반수공결구적표면가고화수보요구。
Ultra High Toughness Cementitious Composites (UHTCC for short), is a kind of high perfor?mance fiber reinforced composite with good deformability and crack-controlling ability. Thus,UHTCC is par?ticularly suitable for strengthening and repair of hydraulic structures. However, traditional UHTCC will cause pump difficulty, tube plugging and other coherent problems if using spray method. These problems would limit the material engineering application to some degree. A new design of sprayable UHTCC is intro?duced in this paper, it has several advantages, such as quite low rebound degree, continuously spray pro?cess with seldom tube plugging problems,uniform fiber distribution. Mechanical tests are carried out includ?ing compression test, three-point bending test and direct tension test. The results show that sprayable UHTCC has quite good mechanical properties and retaining multiple crack pattern, which can meet the re?quirement of hydraulic structures.