不同龄期水硬性石灰力学性能变化规律及机理研究
Study on variation and mechanism of mechanical properties of hydraulic lime at different curing age
Received:March 02, 2021  Revised:May 19, 2021
DOI:10.7520/1001-4888-21-043
中文关键词:  水硬性石灰  NHL3.5  抗压强度  局部变形区  微观机理
英文关键词:hydraulic lime  NHL3.5  compressive strength  local deformation zone  microscopic mechanism
基金项目:国家自然科学基金(51404136, 51474121, 51574139);辽宁省自然科学基金指导计划项目(20180550869)
Author NameAffiliation
YANG Jianlin* College of Materials Science an Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China 
BAI Yuxin College of Materials Science an Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China 
WANG Laigui College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China 
BAI Shizhen College of Materials Science an Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China 
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中文摘要:
      为满足石质文物不同的修复和加固需求,以我国广泛存在且储量大的长石和石灰石为原材料,在950℃温度下煅烧不同时间制备水硬性石灰,对不同龄期试件进行X射线衍射、红外光谱、硬度、抗压强度、压破坏过程、微观形貌测试,对试件成分、力学性能及力学性能变化机理等进行研究。结果表明:(1)
英文摘要:
      In order to meet the different restoration and reinforcement needs of stone cultural relics in our country, hydraulic lime with different curing time, XRD, infrared spectroscopy, hardness, compressive strength, compressive failure process and microscopic morphology is analyzed. Feldspar and limestone which are widely available and have large reserves in China, are used as raw materials. The hydraulic lime is then prepared by calcining them for different duration at 950℃. The composition and mechanism of mechanical properties of the specimens are studied. The research shows that: (1) The contents of CaO, 2CaO·SiO2 and 2CaO·Al2O3·SiO2 in hydraulic lime are similar to those in European hydraulic lime NHL3.5, using feldspar and limestone as raw materials calcined at 950℃ for 6h. (2) With the increase of curing age, the contents of C-S-H and CaCO3 in hydraulic lime gradually increase, which become most obviously as the curing age is located between 7 and 21 days. At curing age of 21 days, the diffraction peak of Ca(OH)2 almost disappears, indicating that the carbonization reacts at a faster rate for the hydraulic lime, prepared with feldspar and limestone. (3) The hardness increases in a linear manner at the curing age of 7 to 21 days and increases much slowly at the curing age of 21 to 28 days. (4) As the compressive stress increases, the area of strain concentration zones arises, small adjacent local deformation regions merge into strain localized zones, which finally develop into the macro-crack. As the curing age increases, the elastic modulus and strength of the sample increase. (5) As the curing age increases, the number of needle stick shaped C-S-H increases, and C-S-H and granular CaCO3 interweave to form a dense microstructure, which reduces the porosity and increases the hardness and strength of hydraulic lime.
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