Abstract
This article discusses the background and history of the emergence of innovative, popular today, types of rebar for construction, their distinctive features and quality indicators, the methodology and results of various studies conducted on the basis of NIIZHB named after A.A. Gvozdev of JSC Research Center of Construction and LLC Technological Institute VNIIzhelezobeton . The purpose of this article is to introduce new types of innovative rebar products and demonstrate their advantages. For the tests, the results and methods of which are given in the article, test rolls of rebar with a four-row screw profile were made. In terms of strength and deformability of adhesion to concrete, the reinforcement with multi-row (four-row and six-row) reinforcement profiles significantly surpassed the reinforcement with two-row crescent (European) and screw (GEWI-Stahl analog) profiles. It has demonstrated high adhesion to concrete not only in the operational, but also in the extreme stage of deformation of the reinforcement. This article discusses the background and history of the emergence of innovative, popular today, types of rebar for construction, their distinctive features and quality indicators, the methodology and results of various studies conducted on the basis of NIIZHB named after A.A. Gvozdev of JSC Research Center of Construction and LLC Technological Institute VNIIzhelezobeton . The purpose of this article is to introduce new types of innovative rebar products and demonstrate their advantages. For the tests, the results and methods of which are given in the article, test rolls of rebar with a four-row screw profile were made. In terms of strength and deformability of adhesion to concrete, the reinforcement with multi-row (four-row and six-row) reinforcement profiles significantly surpassed the reinforcement with two-row crescent (European) and screw (GEWI-Stahl analog) profiles. It has demonstrated high adhesion to concrete not only in the operational, but also in the extreme stage of deformation of the reinforcement.
Highlights
This article discusses the background and history of the emergence of innovative, popular today, types of rebar for construction, their distinctive features and quality indicators, the methodology and results of various studies conducted on the basis of NIIZHB named after A.A
The results and methods of which are given in the article, test rolls of rebar with a four-row screw profile were made
Article history: Received: April 14, 2020 Revised: May 19, 2020 Accepted: June 1, 2020
Summary
А. Гвоздева АО «НИЦ “Строительство”», Российская Федерация, 109428, Москва, 2-я Институтская ул., д. В статье рассмотрены предпосылки и история возникновения инновационных, востребованных на сегодняшний день видов арматурного проката для строительства, их отличительные особенности и качественные показатели, приведены методология и результаты различных исследований, проведенных на базе НИИЖБ имени А.А. Результаты и методика которых приведены в статье, были изготовлены пробные прокатки арматуры с четырехрядным винтовым профилем. По прочности и деформативности сцепления с бетоном арматура с многорядным (четырехрядным и шестирядным) арматурным профилем существенно превзошла арматуру с двухрядным серповидным (европейским) и винтовым (аналог GEWI-Stahl) профилями. От эффективности сцепления с бетоном периодического профиля поверхности арматурного проката зависит длина анкеровки арматуры на опорах железобетонных плит и балок, прочность. Нормативные документы того времени для проектирования железобетонных конструкций создавались на базе результатов испытаний элементов (плит, балок стоек и т.п.), армированных кольцевой арматурой по ГОСТ 5781-82, имеющей высокие показатели сцепления с бетоном. (СП 35.13330.2011) «Мосты и трубы» до настоящего времени предусмотрено использование кольцевой арматуры по ГОСТ 5781-82, для которой из-за ее низкой выносливости введены к расчетному сопротивлению понижающие коэффициенты условий работы (m), зависящие от характеристик многократно повторяющихся циклических нагрузок и наличия сварных соединений
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