Multi-Parameter Methodology for Assessing Quality Indicators of Nanomodified Fiber-Reinforced Concrete for Construction Site

S. N. Leonovich, E. A. Sadovskaya, A. A. Koleda
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Abstract

Nanomodified fiber-reinforced concrete is a building material for which the required characteristics of fracture toughness are a distinctive feature. Determination of the stress intensity factor of fiber-reinforced concrete makes it possible to correctly assess the resistance of the material during the formation and development of cracks. The proposed multi-parameter methodology for assessing the quality indicators of nanomodified fiber-reinforced concrete makes it possible to evaluate the quality of a fiber-reinforced concrete structure in construction and laboratory conditions. To carry out control at the construction site, modern and long-used methods of non-destructive testing are used: ultrasonic sounding, ultrasonic tomography, elastic rebound, separation with chipping. For laboratory studies, the technique provides for the manufacture of prism samples that can be molded or cut from the body of the structure. This methodology makes it possible to obtain in laboratory conditions such material parameters as tensile strength in bending, tensile strength in splitting, critical stress intensity factor for normal separation, critical stress intensity factor for transverse shear, energy consumption for individual stages of deformation and destruction of the sample, as well as to evaluate the uniformity of distribution fibers. Moreover, it is provided to obtain all the parameters on one sample from the series, which eliminates errors and inaccuracies in the quality indicators of the material associated with different conditions of hardening, molding, inaccuracies in duplicating the composition.
施工现场纳米改性纤维增强混凝土质量指标的多参数评价方法
纳米改性纤维增强混凝土是一种具有断裂韧性的建筑材料。测定纤维混凝土的应力强度因子,可以正确地评估材料在裂缝形成和发展过程中的阻力。提出的评价纳米改性纤维增强混凝土质量指标的多参数方法,使得在施工和实验室条件下评价纤维增强混凝土结构的质量成为可能。为了在施工现场进行控制,使用了现代和长期使用的无损检测方法:超声波测深,超声波层析,弹性回弹,分离与切屑。对于实验室研究,该技术提供了棱镜样品的制造,可以从结构体上模压或切割。这种方法可以在实验室条件下获得材料参数,如弯曲时的抗拉强度、劈裂时的抗拉强度、正常分离时的临界应力强度因子、横向剪切时的临界应力强度因子、试样变形和破坏的各个阶段的能量消耗,以及评估纤维分布的均匀性。此外,还提供了从该系列中获得一个样品的所有参数,从而消除了与不同硬化、成型条件相关的材料质量指标的误差和不准确性,以及重复成分的不准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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