Effects of Curing Temperature and Chemical Admixture Type on Fresh Properties and Compressive Strength of Ultra High-performance Concrete

Aswed, Khaldon K.; Hassan, Maan S.; Al-Quraishi, Hussein

doi:10.30684/etj.2022.132300.1103

	Effects of Curing Temperature and Chemical Admixture Type on Fresh Properties and Compressive Strength of Ultra High-performance Concrete
Engineering and Technology Journal
Article 11, Volume 40, Issue 11, November 2022, Pages 1448-1454 PDF (545.48 K)
Document Type: Research Paper
DOI: 10.30684/etj.2022.132300.1103
Authors
Khaldon K. Aswed^* ¹; Maan S. Hassan²; Hussein Al-Quraishi³
¹Civil Engineering Dept, University of Technology, Baghdad, Iraq
²Civil Engineering Dept., Uviversity of Technology, Baghdad, Iraq
³Civil Engineering Dept., University of Technology, Baghdad, Iraq
Abstract
The types of post-setting curing and high range water reducing (HRWR) admixture used in Ultra-High-Performance Concrete (UHPC) mixtures play significant roles in determining their rheological and mechanical properties. This study compares the performance of three types of HRWR admixtures commercially available when added to UHPC mixtures under three different curing regimes. Mixtures made with the different superplasticizers were evaluated for their flow, 45mins flow retention, and setting time as fresh mix properties. Compressive strength was also tested for each mixture after 3, 7, and 28 days of curing at the investigated various curing regimes. Sika Viscocrete 180GS produced the highest mixture flow and flow retention levels with a 241 mm flow and 93.7% flow retention. Sika Viscocrete 168-1 produced the best results of setting time with 3 hours as compared to 12 hours with Sika Viscocrete 180GS. Using Hyperplast PC-202, the required 150 MPa compressive strength was secured as early as 3 days of curing with a 48hrs-90ºC curing regime. Using the same HRWR admixture, compressive strength values slightly lower than 150 MPa were reached after 7-28 days when the 72hrs-60ºC regime was adopted. The last curing regime was recommended for producing architectural UHPC units to minimize the delayed formation of ettringite.
Highlights
Three types of chemical admixtures and curing regimes were used with ultra-high-performance concrete (UHPC). 150 MPa compressive strength is secured after 72 hours using Hyperplast PC-202 and curing at 90ºC. UHPC mixtures require high admixture dosages, resulting in prolonged setting time.
Keywords
UHPC; HRWR Admixtures; Curing regimes; flowability; Setting time

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