混凝土抗冻耐久性能研究进展.pdf

2017年第4期(总第330期
混
凝
土
理论硏究
Number 4 in 2017(Total No330
Concrete
THEORETICAL RESEARCH
doi:10.3969j.iss.1002-3550.2017.04.005
混凝土抗冻耐久性能研究进展
宇晓,张莹秋,袁书成,董江峰,王清远
(四川大学建筑与环境学院,四川成都610065)
摘要:冻融破坏是指含水或与水接触的混凝土在长期正负温度交替循环作用下在表而产生拉裂缝,诱导内部裂缝开展最终使
混凝土性能全面劣化的剥蚀破坏。我国幅员辽阔,三北地区大部分建筑物及西南高山高原地区的重要工程都受到冻融破坏的影啊,
给建设工作带来巨大挑战:冻融破坏已成为上述地区结构服役期间最主要的不利因素,产生巨大的安全隐患和经济损失。结合国
内外冻融破坏研究现状,介绍混凝土、再生混凝土、纤维増强混凝土及纤维増强再生混凝土在冻融循环条件下的力学性能、宏观
表现及微观破坏机理。通过对比探讨提高混凝土及鬥生混凝土抗冻耐久性的方法,对新型混凝土尤其是纤维増强再生混凝土应用于
未来建设活动的必要性和可行性做出展望
关键词:冻融破坏;再生混凝土:纤维增强混凝士;再生混凝土
中图分类号:TU528.01文献标志码:A文章编号:1002-3550(2017)04-0015-06
Review on frost resistance durability of different concrete materials
YU Xiao, ZHANG Yingqiu, YUAN Shucheng, DONGG fangfeng, WANG Qingyuan
College of Architecture and Environment, Sichuan University, Chengdu 610065, China
Abstract: Freeze-thaw cycling damage refers to the situation when the concrete in contact with water is under the action of positive and
negative temperatures alternately cyele for a long time. it may induced the pull cracks, which leads to the internal cracks make comprehen
sive perormance degradation of concrete denudation eventually. China is a vast territory, thus the most buildings in the Three-north region
(the Northeast, the Northwest and the North China ) and some important engineering in the Southwest's alpine plateau are affected by
lreeze-thaw damage, which brings a great challenge to the construction. Free,E-thaw damage has become the main negative factor to the
constructions in its duration of use, leading to a great potential safety hazard and economic losses. Based on the researches about the
freeze-thaw damage at home and abroad, introduces the mechanical property, the macro performance and the microscopic failure mecha
nism of the concrete, recycled concrete, fiber reinforced concrete and the fiber reinforced recycled concrete under the condition of the
freeze-thaw ccle. By comparing the study methods of improvin the durability of concrete and recycled concrete frost resistance of con
crete, it also make a good prospect to the necessity and feasibility of the new type of concrete, especially the new fiber reinforced recycled
oncrete being applied to or construction activities in the future
Key words: lreeze-thaw cycling damage; recycled concrete; iber rein forced concrete; recycled concrete
循环条件下耐久性的研究受到广泛关注,也显得更加重要。
混凝土是当今世界工程中用量最大的建筑材料,因其
普通況凝土
良好的耐久性、价格相对低廉以及与可朝性强等优点,被
泥凝土冻融循环产生的破坏作用主要有冻胀开裂和
广泛用于桥梁、大坝高速公路、工业与民用建筑等结构中。表面剥蚀两个方面混凝土经过冻融循环,内部空隙逐渐
而处在寒冷地区的混凝土建筑物,特别是那些处于干湿交増大,裂纹增多,混凝土越米越疏松,导致混凝土的弹性模
替环境中的结构,如水坝、桥墩、涵洞、港口码头等,由于混量、抗压强度、抗拉强度等力学性能产生明显下降,表层混
凝土的抗渗抗冻性能的缺陷和年复一年交替的冻融循坏凝土剥落,严重危害结构的安全。
而发生耐久性破坏,严重地影响了工程结构的安全和寿命
大连理工大学宋玉普等对普通混凝土在冻融循环条
我国出现冻融破坏的结构主要集中在三北地区,尤其件下的性能表现、损伤特性做了较为系统的研究。他们
是在东北地区,绝大部分建筑都存在局部甚至大面积的冻利用快冻法完成了混凝土立方体试块在冻融循环后的性
融破坏。部分高原冻土区重要工程也一定程度上受到冻能试验,研究了普通混凝土力学性能、变形性能、应力应变
融影响。随着这一问题的日益突出不同种和类混凝土在冻融关系等随冻融循环次数的变化关系,研究表明随着循环
收稿日期:2016-0409
基金项目:四川大学-大学生创新创业训练计划(1030504138012);国家自然科学基金(51408382)
万方数据