摘要
为了研究纤维材料对再生混凝土力学性能的影响,通过在取代率为30%、50%的再生混凝土试件中,掺入不同含量的PPF-1、PPF-2、RSF-1三种纤维,研究其破坏形态、抗压强度、劈裂抗拉强度、抗折强度和变形等力学性能。研究结果表明:含纤维的再生混凝土试件与普通混凝土试件的破坏形态基本相同,而纤维的掺入提高了RAC的抗拉性能,尤其是含PPF-1、PPF-2的RAC效果好于RSF-1;从改性RAC的变形性能数据分析可知,变形控制主要取决于纤维种类及纤维与水泥浆体之间的变形协调作用。对于改性RAC的切线模量,未掺加纤维呈线性递减,而掺加纤维后虽呈下降趋势但较为离散,通过建立纤维再生混凝土的应力-应变、应力-切线模量的数学关系,可以更好的为纤维改性RAC的实际运用提供借鉴意义。
In order to study the effect of fiber material on the mechanical properties of recycled concrete,through adding three kinds of fibers with different content of PPF-1,PPF-2 and RSF-1 in the recycled concrete specimens with 30% and 50% substitution rates,the mechanical properties such as failure form,compressive strength,splitting tensile strength,flexural strength and deformation are studied.The results show that the damaged form of recycled concrete with fiber is the same as that of ordinary concrete,and the addition of fiber improves the tensile properties of RAC,especially the RAC effect of PPF-1 and PPF-2 is better than RSF-1.From the analysis of the deformation performance data of modified RAC,the deformation control is mainly determined by the fiber type and the type of fiber.The deformation coordination between fiber and cement paste.For the tangent modulus of the modified RAC,the non addition of fiber is linearly decreasing,but the addition of fiber is declining,but it is more discrete.The mathematical relationship of stress strain,stress and tangent modulus of fiber regenerated concrete can be set up,which can provide a better reference for the practical application of fiber modified RAC.
作者
杨力源
张博
张明明
YANG Liyuan;ZHANG Bo;ZHANG Mingming(School of Civil Engineering,Xijing University,Xi′an 710123,China;School of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)
出处
《混凝土》
CAS
北大核心
2019年第11期115-118,122,共5页
Concrete
基金
国家自然科学基金（51178388,51008245）
陕西省教育厅重点实验室科研计划项目（11JS059,12JS055）
陕西省重点实验室访问学者项目（12JS055）
西京学院校级科研基金项目（XJ170123）
关键词
应力-应变
切线模量
破坏形态
韧性
stress-strain
tangent modulus
failure form
toughness
