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Engineering of ultra-high performance self-compacting mortar with recycled steel fibres extracted from waste tires

Abdolpour Hassan, Niewiadomski Paweł, Sadowski Łukasz, Kwiecień Arkadiusz

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e175, 2022

The main novelty of this study is producing Ultra High-Performance Self Compacting Mortar (UHPSCM) incorporated Recycled Steel Fibre (RSF) from waste tires. For this purpose, different mix compositions including 0%, 1%, and 3% RSF content in terms of volume were proposed. Self-compacting ability was assessed using mini-cone tests, while nondestructive testing has been used to evaluate the effect of RSF inclusion on the compaction of UHPSCM constituent materials. Mechanical performances were investigated using compression and unnotched flexural tests. Residual flexural strength in both service limit state (SLS), ultimate limit state (ULS), and two equivalent flexural strengths were evaluated under notched flexural tests and analysed using statistical approaches. Concrete Damage Plasticity (CDP) has been employed for the analysis behaviour of developed mortars under different loadings. Additionally, an element deletion approach was used to evaluate the fracture of UHPSCM under compression and flexural loadings. The experimental results showed that adding 1% and 3% of RSF resulted in decreasing workability by 3% and 22%, respectively. Improving compressive strength by 16% and 22% and flexural by 7% and 8% were noticed in the case of samples with 1% and 3% fiber, respectively, in 28 days. In spite of the significant improvement of post-cracking behaviour of samples with 3% of RSF, this behaviour was insignificant for the samples with 1% of RSF. However, with less amount of fibre inclusion, brittle failure can be altered to ductile failure. Moreover, the behaviour of the tested specimens under different loadings was successfully predicted using Finite Element (FE) simulations.

Damage analysis of tensioning cable anchorage zone of a bridge superstructure, using CDP ABAQUS material model

Chróścielewski J., Miśkiewicz M., Pyrzowski Ł., Sobczyk B.

Archives of Civil Engineering

2017

Vol. 63, nr 3

3--18

Numerical analysis of the tensioning cables anchorage zone of a bridge superstructure is presented in this paper. It aims to identify why severe concrete cracking occurs during the tensioning process in the vicinity of anchor heads. In order to simulate the tensioning, among others, a so-called local numerical model of a section of the bridge superstructure was created in the Abaqus Finite Element Method (FEM) environment. The model contains all the important elements of the analyzed section of the concrete bridge superstructure, namely concrete, reinforcement and the anchoring system. FEM analyses are performed with the inclusion of both material and geometric nonlinearities. Concrete Damage Plasticity (CDP) constitutive relation from Abaqus is used to describe nonlinear concrete behaviour, which enables analysis of concrete damage and crack propagation. These numerical FEM results are then compared with actual crack patterns, which have been spotted and inventoried at the bridge construction site.

W trakcie prac budowlanych związanych z wykonaniem centrycznego sprężenia podłużnego przęseł mostu doszło do silnych zarysowań betonu bloków kotwiących. Pojawiły się znaczne rysy/pęknięcia poziome w strefie zakotwień na wysokości zbrojenia siatkami. W referacie podjęto próbę opisu mechanizmu zniszczenia strefy zakotwień kabli wewnętrznych sprężenia podłużnego jednego z przęseł mostu z wykorzystaniem środowiska metody elementów skończonych (MES) systemu ABAQUS. Wykonano symulację numeryczną niepożądanych zjawisk lokalnych zarysowania w blokach kotwiących kable, które wystąpiło w trakcie procesu sprężania konstrukcji. Miało to na celu ustalenie, od strony mechaniki, przyczyn ich powstania, w kontekście zaprojektowanego i wykonstruowanego układu zbrojenia.