可持续纤维增强高强轻质混凝土的延性增强

Ductility Enhancement of Sustainable Fibrous-Reinforced High-Strength Lightweight Concrete.

作者信息

Hosen Md Akter, Shammas Mahaad Issa, Shill Sukanta Kumer, Al-Deen Safat, Jumaat Mohd Zamin, Hashim Huzaifa

机构信息

Department of Civil and Environmental Engineering, College of Engineering, Dhofar University, P.O. Box 2509, Salalah PC 211, Oman.

School of Engineering, Deakin University, Waurn Ponds, VIC 3216, Australia.

出版信息

Polymers (Basel). 2022 Feb 14;14(4):727. doi: 10.3390/polym14040727.

DOI:10.3390/polym14040727

PMID:35215640

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8877318/

Abstract

To limit the cross-sectional size of concrete structures, high-strength, lightweight concrete is preferred for the design and construction of structural elements. However, the main drawback of high-strength, lightweight concrete is its brittleness over normal-weight concrete. The ductility of concrete is a crucial factor, which plays an important role when the concrete structures are subjected to extreme situations, such as earthquakes and wind. This study aims to improve the ductility of high-strength, lightweight concrete by incorporating steel fibers. The palm oil clinker (POC)-based, high-strength, lightweight concrete specimens reinforced with steel fibers were prepared and their ductility was systematically examined. POC was used as aggregates and supplementary cementitious materials. Steel fibers from 0-1.50% (by volume), with an increment of 0.5%, were used in the concrete mix. Compression ductility, displacement ductility and energy ductility were used as indicators to evaluate the enhancement of ductility. Moreover, the compressive strength, flexural strength, stress-strain behavior, modulus of elasticity, load-displacement characteristics, energy absorption capacity and deformability of the concrete samples were investigated. The compression ductility, displacement ductility and energy ductility indexes were found to be increased by up to 472%, 140% and 568% compared to the control specimens (concrete with 0% steel fibers), respectively. Moreover, the deformability and energy absorption capacity of the concrete were increased by up to 566% and 125%, respectively. Therefore, POC-based, high-strength, fibrous, lightweight concrete could perform better than conventional concrete under extreme loading conditions as it showed significantly higher ductility.

摘要

为了限制混凝土结构的横截面尺寸，在结构构件的设计和施工中，高强度轻质混凝土是首选。然而，高强度轻质混凝土的主要缺点是其相对于普通重量混凝土的脆性。混凝土的延性是一个关键因素，当混凝土结构遭受地震和风等极端情况时，它起着重要作用。本研究旨在通过掺入钢纤维来提高高强度轻质混凝土的延性。制备了用钢纤维增强的基于棕榈油熟料（POC）的高强度轻质混凝土试件，并系统地研究了它们的延性。POC用作骨料和辅助胶凝材料。在混凝土混合料中使用体积分数为0 - 1.50%、增量为0.5%的钢纤维。使用抗压延性、位移延性和能量延性作为指标来评估延性的增强。此外，还研究了混凝土样品的抗压强度、抗弯强度、应力 - 应变行为、弹性模量、荷载 - 位移特性、能量吸收能力和变形能力。与对照试件（含0%钢纤维的混凝土）相比，抗压延性、位移延性和能量延性指标分别提高了472%、140%和568%。此外，混凝土的变形能力和能量吸收能力分别提高了566%和125%。因此，基于POC的高强度纤维轻质混凝土在极端荷载条件下的性能可能优于传统混凝土，因为它表现出明显更高的延性。