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水泥基材料为多相多尺度结构，各组分均不同程度影响整体韧性，将相关组分按宏观、介观、纳观3个尺度分类概述其对水泥基材料的抗裂增韧机理。宏观尺度如胶凝组分、集料、外加剂、纤维、水胶比、养护制度等，分析其物化效应对水泥基材料抗裂增韧特性的影响机理；介观尺度如微珠、晶须、渗透结晶材料等微米级增强材料，阐述其火山灰、填充、桥接、键合、渗透结晶等增强效应；纳观尺度如纳米SiO2、纳米CaCO3、石墨烯、碳纳米管及微生物、纳米聚合物等纳米级增强材料，介绍其对水化产物微观结构、生长方式及硬化浆体孔结构的增强及优化机理；并阐述‘碳纤维+碳纳米管’、‘纤维+晶须+石墨烯’等跨尺度组分的共轭增韧效应。最后，讨论不同尺度增韧组分当前应用、研究中的不足及发展趋势。
Abstract：Cement-based materials have a multi-phase and multi-scale structure,and each component forming the structure affects the overall toughness to varying degrees.This review summarized the cracking-resistance and toughening mechanisms of relevant components classified in macroscale,mesoscale and nanoscale to cement-based materials.In the macroscale (such as the cementitious component,aggregate,admixture,fiber,water-binder ratio,curing system,etc.),the influence mechanisms of the physicochemical effects of relevant components on the cracking resistance and toughening characteristics of cement-based materials were analyzed.In the mesoscale (such as microsphere,whisker,capillary crystalline material,etc.),the enhancement effects such as volcanic ash,filling,bridging,bonding,capillary crystallization were described.In the nanoscale (such as nano-SiO2,nano-CaCO3,graphene,carbon nanotube,microorganism,nano-polymer,etc.),the mechanisms enhancing and optimizing the microstructure of hydration products,growth mode,and pore structure of hardened paste were introduced.The conjugating toughening effects of cross-scale components such as‘carbon fiber+carbon nanotubes’,‘fiber+whisker+graphene’were elucidated.In addition,the shortcomings in the current application/research,and the future development trends for toughening components in different scales were also discussed.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20230540
中图分类号:TU528
引用信息:
[1]雷东移,李明昂,张鹏,等.水泥基材料多尺度抗裂增韧机理研究进展[J].硅酸盐学报,2023,51(11):2876-2889.DOI:10.14062/j.issn.0454-5648.20230540.
基金信息:
国家自然科学基金(U22A20244,52008223); 西海岸新区科技惠民专项(2021-102); 青创科技支持计划(2021KJ045); 山东省自然科学基金(ZR2020QE252); 海洋环境混凝土技术教育部工程中心开放课题(TMduracon2022009,TMduracon2022019); 宁波市科技创新2025重大专项(2020Z035)
2023-07-26
2023
2023-10-08
2023-10-07
2023
1
2023-10-08
2023-10-08
2023-10-08