Self-healing Behaviour of Ultra-High-Performance Concrete Under Constant Load

Mohammad Alameri, Mohamed Mohamed Sadakkathulla, Abdul Hamid Sheikh, Mohamed Elchalakani

Research output: Chapter in Book/Conference paperConference paperpeer-review

Abstract

Concrete technology has been developing remarkably in recent decades. One of the most significant developments is the invention of ultra-high-performance concrete (UHPC), which can cope with the higher level of demands associated with complex structures, such as long-span bridges. The strength and durability of this type of concrete are quite high. However, this kind of concrete needs a very low water-to-cement ratio (up to 0.2); consequently, the hydrated cement particles could not exceed 26%. Hence, the cracks may appear frequently due to the autogenous shrinkage. To overcome autogenous shrinkage, a superabsorbent polymer (SAP) is used as an internal curing agent to subsequently increase the hydration of anhydrous cement particles. Much research has focused on inducing cracks under different curing conditions and observing the behaviour of the specimens when re-loaded, whether the cracks that had been induced had sealed during the curing time, and whether strength had been gained after re-loading. As such, in this research, a constant cracking load was applied to a pull-out specimen for 28 days under two different curing conditions (water curing and wet and dry cycles). The mix design for these specimens was UHPC with SAP of 0.3% and 0.4% of the total binder. Also, a reference UHPC mix has been used for comparison purposes. The results show that using SAP in the UHPC mix has the ability to boost the self-healing mechanism present in ultra-high-performance concrete. Additionally, tensile strength behaviour improved in the UHPC mix with 0.3% SAP.

Original languageEnglish
Title of host publicationBuilding for the Future
Subtitle of host publicationDurable, Sustainable, Resilient - Proceedings of the Symposium 2023 - Volume 1
EditorsAlper Ilki, Derya Çavunt, Yavuz Selim Çavunt
Place of PublicationCham
PublisherSpringer Science + Business Media
Pages506-513
Number of pages8
ISBN (Print)9783031325182
DOIs
Publication statusPublished - 1 Jun 2023
EventInternational Symposium of the International Federation for Structural Concrete, fib Symposium 2023 - Istanbul, Türkiye
Duration: 5 Jun 20237 Jun 2023

Publication series

NameLecture Notes in Civil Engineering
Volume349 LNCE
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

ConferenceInternational Symposium of the International Federation for Structural Concrete, fib Symposium 2023
Country/TerritoryTürkiye
CityIstanbul
Period5/06/237/06/23

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