建筑科学与工程学报
建築科學與工程學報
건축과학여공정학보
Journal of Architecture and Civil Engineering
2015年
5期
47-55
,共9页
纤维纳米混凝土%力学性能%微观增强机理%坍落度
纖維納米混凝土%力學性能%微觀增彊機理%坍落度
섬유납미혼응토%역학성능%미관증강궤리%담락도
fiber and nanosized material reinforced concrete%mechanical property%micro enhance-ment mechanism%slump
将微观分析与宏观性能试验相结合，探讨钢纤维体积分数和纳米材料掺量对纤维纳米增强混凝土微观机理与物理力学性能的影响。根据复合材料力学理论，并结合相关文献试验结果的统计分析，建立了考虑纳米材料和纤维影响的纤维纳米混凝土强度计算模型。结果表明：在混凝土中掺入适量的纤维和纳米材料，改善了混凝土的微观结构，增加了混凝土的密实性，提高了混凝土的物理力学性能；随钢纤维体积分数从0％增大到1．5％，拌和物坍落度从40mm逐渐减小到25mm，纤维纳米混凝土抗压强度、劈拉强度和抗折强度分别提高12％，32％和12．5％；随着纳米SiO2掺量（质量分数）从0％增大到2％，拌和物坍落度减小95 mm，初凝、终凝时间分别减小52．3％和35．9％，纤维纳米混凝土抗压强度、劈拉强度和抗折强度分别提高9％，24％和14．7％；随着纳米CaCO3掺量从0％增大到2％，拌和物坍落度减小50 mm ，初凝、终凝时间分别减小35．2％和3．8％，纤维纳米混凝土抗压强度、劈拉强度和抗折强度分别提高8％，20％和8．8％。
將微觀分析與宏觀性能試驗相結閤，探討鋼纖維體積分數和納米材料摻量對纖維納米增彊混凝土微觀機理與物理力學性能的影響。根據複閤材料力學理論，併結閤相關文獻試驗結果的統計分析，建立瞭攷慮納米材料和纖維影響的纖維納米混凝土彊度計算模型。結果錶明：在混凝土中摻入適量的纖維和納米材料，改善瞭混凝土的微觀結構，增加瞭混凝土的密實性，提高瞭混凝土的物理力學性能；隨鋼纖維體積分數從0％增大到1．5％，拌和物坍落度從40mm逐漸減小到25mm，纖維納米混凝土抗壓彊度、劈拉彊度和抗摺彊度分彆提高12％，32％和12．5％；隨著納米SiO2摻量（質量分數）從0％增大到2％，拌和物坍落度減小95 mm，初凝、終凝時間分彆減小52．3％和35．9％，纖維納米混凝土抗壓彊度、劈拉彊度和抗摺彊度分彆提高9％，24％和14．7％；隨著納米CaCO3摻量從0％增大到2％，拌和物坍落度減小50 mm ，初凝、終凝時間分彆減小35．2％和3．8％，纖維納米混凝土抗壓彊度、劈拉彊度和抗摺彊度分彆提高8％，20％和8．8％。
장미관분석여굉관성능시험상결합，탐토강섬유체적분수화납미재료참량대섬유납미증강혼응토미관궤리여물리역학성능적영향。근거복합재료역학이론，병결합상관문헌시험결과적통계분석，건립료고필납미재료화섬유영향적섬유납미혼응토강도계산모형。결과표명：재혼응토중참입괄량적섬유화납미재료，개선료혼응토적미관결구，증가료혼응토적밀실성，제고료혼응토적물리역학성능；수강섬유체적분수종0％증대도1．5％，반화물담락도종40mm축점감소도25mm，섬유납미혼응토항압강도、벽랍강도화항절강도분별제고12％，32％화12．5％；수착납미SiO2참량（질량분수）종0％증대도2％，반화물담락도감소95 mm，초응、종응시간분별감소52．3％화35．9％，섬유납미혼응토항압강도、벽랍강도화항절강도분별제고9％，24％화14．7％；수착납미CaCO3참량종0％증대도2％，반화물담락도감소50 mm ，초응、종응시간분별감소35．2％화3．8％，섬유납미혼응토항압강도、벽랍강도화항절강도분별제고8％，20％화8．8％。
By combining the micro analysis and macro property experiments ,the effect of steel fiber volume fraction and nanosized material content on the micro mechanism and physical and mechanical properties of fiber and nanosized material reinforced concrete (FNMRC ) was investigated .Based on the mechanics theory of composite materials and the regression analysis of related literatures ,a model for strength calculation of FNMRC was proposed ,which considered the effect of nanosized materials and steel fiber .The results show that the suitable combined usage of nanosized materials with steel fiber improves the microstructure of concrete ,increases its densification and enhances the physical and mechanical properties .With the increase of steel fiber volume fraction from 0% to 1 .5% ,the mixture slump decrease from 40 mm to 25 mm ,and the compressive strength ,splitting tensile strength and flexural strength of FNMRC increase by 12% ,32% and 12 .5% ,respectively .With the increase of nano‐SiO2 content (mass fraction) from 0% to 2% ,the mixture slump reduces 95 mm ,and the initial and final setting time reduce 52 .3% and 35 .9% ,respectively ,and the compressive strength ,splitting tensile strength and flexural strength of FNMRC increase 9% ,24% and 14 .7% ,respectively .With the increase of nano‐CaCO3 content from 0% to 2% ,the mixture slump reduces 50 mm ,and the initial and final setting time reduce 35 .2% and 3 .8% , respectively , and the compressive strength , splitting tensile strength and flexural strength of FNMRC increase 8% ,20% and 8 .8% ,respectively .
