摘要
为提高轨道道床板混凝土抗裂性能,以蜡树叶和猕猴桃树叶制备可以改善混凝土力学性能和抗裂性能的天然改性剂(WTL-E和KTL-E)。开展室内单因素对比试验,进行混凝土抗压强度和劈裂抗拉强度试验,对其力学性能进行研究,并确定了混凝土的最佳配比。设计了混凝土平板收缩和环形约束收缩试验,探究改性剂对混凝土开裂性能的影响。结合微观表征技术对混凝土的内部演化机制进行分析。结果表明:KTL-E比WTL-E具有更小的表面张力,其改性混凝土也表现出更好的力学性能和抗裂性能。当KTL-E掺量为2.8%、粉煤灰为20%时,混凝土改性效果最好。与普通混凝土相比,抗压强度、劈裂强度及开裂时间分别增加了9.46%、7.80%、52.78%,有效提升了混凝土抗裂性能。研究成果可为研发能够提高混凝土抗裂性能的绿色外加剂提供了理论依据。
To improve the cracking resistance of concrete for railroad bed slabs,natural modifiers(WTL-E and KTLE)that can improve mechanical properties and crack resistance of concrete were prepared from wax tree leaves and kiwi tree leaves.Indoor one-factor comparative tests were carried out,and concrete compressive strength and splitting tensile strength tests were performed to study its mechanical properties,and the optimal concrete ratio was determined.Concrete plate shrinkage and annular confinement shrinkage tests were designed to investigate the effect of modifiers on the cracking properties of concrete.The internal evolution mechanism of concrete was analyzed in conjunction with microscopic characterization techniques.The results show that KTL-E has less surface tension than WTL-E,and its modified concrete also exhibits better mechanical properties and crack resistance.The best concrete modification effect is achieved when the KTL-E admixture is 2.8%and fly ash is 20%.Compared with plain concrete,the compressive strength,splitting strength and cracking time increase by 9.46%,7.80%and 52.78%respectively,which effectively improve the cracking resistance of concrete.The research results can provide a theoretical basis for the development of green admixtures that can improve the crack resistance of concrete.
作者
贾宝新
梁世纪
李东泽
周琳力
王猛
丁虹达
张馨
JIA Baoxin;LIANG Shiji;LI Dongze;ZHOU Linli;WANG Meng;DING Hongda;ZHANG Xin(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China;China Railway 18th Bureau Group Corporation Limited,Beijing 100120,China)
出处
《复合材料学报》
北大核心
2025年第7期3925-3939,共15页
Acta Materiae Compositae Sinica
基金
辽宁工程技术大学创新团队项目(LNTU20TD-08)。
关键词
天然改性剂
抗裂性能
平板收缩
环形约束收缩
微观表征
natural modifiers
cracking resistance
flat plate shrinkage
annular confinement shrinkage
microscopic characterization
