混凝土
混凝土
혼응토
CONCRETE
2014年
2期
91-94
,共4页
水泥基复合材料%微观力学%砂灰比%应变硬化%多缝开裂
水泥基複閤材料%微觀力學%砂灰比%應變硬化%多縫開裂
수니기복합재료%미관역학%사회비%응변경화%다봉개렬
cementitious composite%micromechanics%sand to cement ratio%strain-hardening%multiple cracking
为了提高材料的应变硬化性能，以微观力学为基础，通过四点弯曲试验，研究了砂灰比对PVA增强水泥基复合材料性能的影响。试件尺寸400 mm×100 mm×15 mm。研究表明：纤维含量为2%时，材料的极限挠度高达40 mm，极限强度在10~14 MPa之间；随着砂灰比的增加，材料的极限荷载和挠度具有相似的变化趋势；并且所有砂灰比试件都表现出了应变硬化现象和纯弯曲段的多缝开裂现象。
為瞭提高材料的應變硬化性能，以微觀力學為基礎，通過四點彎麯試驗，研究瞭砂灰比對PVA增彊水泥基複閤材料性能的影響。試件呎吋400 mm×100 mm×15 mm。研究錶明：纖維含量為2%時，材料的極限撓度高達40 mm，極限彊度在10~14 MPa之間；隨著砂灰比的增加，材料的極限荷載和撓度具有相似的變化趨勢；併且所有砂灰比試件都錶現齣瞭應變硬化現象和純彎麯段的多縫開裂現象。
위료제고재료적응변경화성능，이미관역학위기출，통과사점만곡시험，연구료사회비대PVA증강수니기복합재료성능적영향。시건척촌400 mm×100 mm×15 mm。연구표명：섬유함량위2%시，재료적겁한뇨도고체40 mm，겁한강도재10~14 MPa지간；수착사회비적증가，재료적겁한하재화뇨도구유상사적변화추세；병차소유사회비시건도표현출료응변경화현상화순만곡단적다봉개렬현상。
In order to improve the strain-hardening property of cement-based composites,the influences of sand to cement ratio on the composite performance were experimentally investigated through four-point bending test based on micromechanics.The specimens used herein measured 400 mm×100 mm×15 mm.Experimental results showed the largest flexible deformation was up to 40 mm,as well as the ultimate flexible strength between 10 MPa and 14 MPa with the fiber volume fraction of 2%.The ultimate strength and the flexible deformation increase similarly accompanied with the sand to cement ratio increasing.All the specimens reveal strain-hardening property and multiple cracking in the pure bending portion.
