混凝土
混凝土
혼응토
CONCRETE
2014年
2期
121-124
,共4页
刘辉%孔祥明%张珍林%蒋凌飞%徐涛%王栋民
劉輝%孔祥明%張珍林%蔣凌飛%徐濤%王棟民
류휘%공상명%장진림%장릉비%서도%왕동민
聚合物纤维%纤维增强砂浆%流动性%力学性能
聚閤物纖維%纖維增彊砂漿%流動性%力學性能
취합물섬유%섬유증강사장%류동성%역학성능
polymer fiber%fiber reinforced mortar%flowability%mechanical property
研究了四类聚合物纤维(超高分子量聚乙烯(UPE)纤维、聚丙烯(PP)纤维、聚乙烯醇(PVA)纤维、聚丙烯腈(PAN)纤维),对水泥砂浆流动性及抗弯力学性能的影响。结果表明:四种纤维都对砂浆的流动性产生不利影响,PAN纤维对砂浆流动性影响最显著。四种纤维对砂浆的三点抗弯力学性能产生不同程度的影响。在荷载作用下,掺加纤维使砂浆的破坏由单裂缝增长的脆性断裂转变为多点开裂。UPE纤维对砂浆力学增韧效果最为显著,纤维掺量为0.5%时,产生明显的应变硬化特征,提高了砂浆的韧性;PP纤维虽然拉伸强度和弹性模量比较低,但掺量0.5%时也可明显提高砂浆的延性。对比两种不同长径比的PVA纤维,测试结果表明,长且细的PVA纤维对扩展度的负面影响更显著,对砂浆的延性和韧性贡献更小。
研究瞭四類聚閤物纖維(超高分子量聚乙烯(UPE)纖維、聚丙烯(PP)纖維、聚乙烯醇(PVA)纖維、聚丙烯腈(PAN)纖維),對水泥砂漿流動性及抗彎力學性能的影響。結果錶明:四種纖維都對砂漿的流動性產生不利影響,PAN纖維對砂漿流動性影響最顯著。四種纖維對砂漿的三點抗彎力學性能產生不同程度的影響。在荷載作用下,摻加纖維使砂漿的破壞由單裂縫增長的脆性斷裂轉變為多點開裂。UPE纖維對砂漿力學增韌效果最為顯著,纖維摻量為0.5%時,產生明顯的應變硬化特徵,提高瞭砂漿的韌性;PP纖維雖然拉伸彊度和彈性模量比較低,但摻量0.5%時也可明顯提高砂漿的延性。對比兩種不同長徑比的PVA纖維,測試結果錶明,長且細的PVA纖維對擴展度的負麵影響更顯著,對砂漿的延性和韌性貢獻更小。
연구료사류취합물섬유(초고분자량취을희(UPE)섬유、취병희(PP)섬유、취을희순(PVA)섬유、취병희정(PAN)섬유),대수니사장류동성급항만역학성능적영향。결과표명:사충섬유도대사장적류동성산생불리영향,PAN섬유대사장류동성영향최현저。사충섬유대사장적삼점항만역학성능산생불동정도적영향。재하재작용하,참가섬유사사장적파배유단렬봉증장적취성단렬전변위다점개렬。UPE섬유대사장역학증인효과최위현저,섬유참량위0.5%시,산생명현적응변경화특정,제고료사장적인성;PP섬유수연랍신강도화탄성모량비교저,단참량0.5%시야가명현제고사장적연성。대비량충불동장경비적PVA섬유,측시결과표명,장차세적PVA섬유대확전도적부면영향경현저,대사장적연성화인성공헌경소。
Four types of polymer fibers(ultra-high molecular weight polyethylene,UPE;polypropylene,PP;polyvinyl alcohol,PVA;polyacrylonitrile,PAN) were added into cement mortars to study their influences on the flowability and bending performance of mortars. Results showed that the four fibers had negative impact on the flow table spread ,among which PAN fiber led to the lowest flow table spread at the same dosage.Fiber reinforced mortars present multiple cracking feature under bending load while neat mortars exhibit brittle failure.UPE fiber modified mortars present strain hardening performance at low dosage ,which provided the mortars a better ductility under bending load.In spite of resulting in lowered elastic modulus and tensile strength of mortars ,PP fibers have positive impact on mechanical performance of mortars at high dosage (0.5%by volume) in terms of stress hardening characteristics,elongation at break etc.Comparison be-tween PVA fibers with different length-diameter ratios showed that the shorter and thinner PVA fiber has more pronounced negative ef-fects on the flow ability and mechanical properties of the modified mortars.