冻融损伤对聚氨酯混凝土力学性能的影响

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Multidiscipline Modeling in Materials and Structures Pub Date : 2022-09-28 DOI:10.1108/mmms-06-2022-0112
Hongyang Wang, Quansheng Sun
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The test results were evaluated to determine the effect of the number of early freeze-thaw cycles and the time node of early freeze-thaw cycles on the mechanical characteristics of polyurethane concrete, which revealed that the time node of freeze-thaw damage impacted the freeze-thaw resistance of polyurethane concrete susceptible to early freeze-thaw damage.Design/methodology/approachThe early-age freeze-thaw damage polyurethane concrete was experimentally studied by controlling the time node of the freeze-thaw cycle and the curing environment. The test considered the time node, frequency of freeze-thaw damage of polyurethane concrete and the influence of subsequent curing environment and observed the mass change, relative dynamic elastic modulus, relative durability index, compressive strength and apparent damage of polyurethane concrete. The early mechanical properties of polyurethane concrete were studied by analyzing the change of numerical value. 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引用次数: 0

摘要

目的聚氨酯混凝土在短期内具有较高的强度-重量比,养护期的强度-重量比阶段至关重要。冻融循环对聚氨酯混凝土的耐久性有明显的破坏作用。研究水化反应不完全的聚氨酯混凝土的工程规范,以及养护过程中内部结构的发展。本文根据北方地区的气候特点和使用环境,在8种不同的维护环境下对聚氨酯混凝土进行了试验。通过对试验结果的评价,确定了早期冻融循环次数和早期冻融循环时间节点对聚氨酯混凝土力学特性的影响,揭示了冻融损伤时间节点对易发生早期冻融损伤的聚氨酯混凝土抗冻融性能的影响。设计/方法/途径通过控制冻融循环时间节点和养护环境,对聚氨酯混凝土早期冻融损伤进行了试验研究。试验考虑了聚氨酯混凝土冻融损伤的时间节点、频率及后续养护环境的影响,观察了聚氨酯混凝土的质量变化、相对动弹性模量、相对耐久性指标、抗压强度和表观损伤情况。通过数值变化分析,研究了聚氨酯混凝土的早期力学性能。采用XRD、FTIR和SEM分析了聚氨酯混凝土强度形成的微观机理。研究结果:根据扫描电镜照片,冻融损伤时间越接近试样硬化时间,试样的力学性能和结构越差。序号为12组的试件,即使在20次解冻后继续养护,其抗压强度也仅为标准组的82.39%,前期环境的增加加剧了聚氨酯混凝土的强度损失,也降低了其抗冻融能力。试验结果表明,养护可以恢复受损聚氨酯混凝土的抗冻融性能。在水中养护比在空气中养护具有更好的回收效果;充分的再固化时间和良好的再固化条件可以恢复材料的力学性能。独创性/价值通过研究聚氨酯混凝土在不同养护时间节点的冻融循环试验及试验结果,探讨聚氨酯混凝土的力学性能与时间节点、冻融循环次数及后续养护环境之间的关系。考虑到聚氨酯混凝土特殊的强度形成机理,冻融损伤后的聚氨酯混凝土在后续维护中具有继续形成强度的能力。本试验研究可为实际工程秋冬极端自然条件下冻融环境下聚氨酯混凝土结构在养护期间的强度形成及修复提供分析依据。
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Effect of freeze-thaw damage at curing time on mechanical properties of polyurethane concrete
PurposePolyurethane concrete has a high strength-to-weight ratio in the short term, and the strength-to-weight ratio stage during the maintenance period is critical. Freeze-thaw cycles have a noticeable damaging effect on the durability of polyurethane concrete. The engineering specification of polyurethane concrete with incomplete hydration reaction must be studied, as well as the development of internal structure during curing. In this paper, the polyurethane concrete tests were set up under eight distinct maintenance settings based on the climate features of the northern area and the service environment. The test results were evaluated to determine the effect of the number of early freeze-thaw cycles and the time node of early freeze-thaw cycles on the mechanical characteristics of polyurethane concrete, which revealed that the time node of freeze-thaw damage impacted the freeze-thaw resistance of polyurethane concrete susceptible to early freeze-thaw damage.Design/methodology/approachThe early-age freeze-thaw damage polyurethane concrete was experimentally studied by controlling the time node of the freeze-thaw cycle and the curing environment. The test considered the time node, frequency of freeze-thaw damage of polyurethane concrete and the influence of subsequent curing environment and observed the mass change, relative dynamic elastic modulus, relative durability index, compressive strength and apparent damage of polyurethane concrete. The early mechanical properties of polyurethane concrete were studied by analyzing the change of numerical value. The microscopic mechanism of strength formation of polyurethane concrete was analyzed by XRD, FTIR and SEM image.FindingsThe closer the time of freeze-thaw damage was to the specimen hardening, the worse the mechanical properties and structure were, according to SEM photographs. For specimens with serial number of 12-groups, its compressive strength is only 82.39% of that of the standard group, even if the curing process continues after 20 times thawing, which increased early environment exacerbate strength loss in polyurethane concrete and also reduced freeze-thaw resistance. The findings of the tests reveal that curing can restore the freeze-thaw resistance of damaged polyurethane concrete. Curing in water has a better recovery impact than curing in air; the mechanical properties can be restored by sufficient re-curing time and good re-curing conditions.Originality/valueBy studying the freeze-thaw cycle test and test results of polyurethane concrete in different curing time nodes, the relationship between the mechanical properties of polyurethane concrete and the time node, number of freeze-thaw cycles, and subsequent maintenance environment was explored. Considering the special mechanism of strength formation of polyurethane concrete, the polyurethane concrete damaged by freeze-thaw has the ability to continue to form strength under subsequent maintenance. This experimental study can provide an analytical basis for the strength formation and reconditioning of polyurethane concrete structures subjected to freeze-thaw environments during the curing time under extreme natural conditions in fall and winter in actual projects.
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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