Rapid Pavement Construction: Research on Thixotropy and Workability Loss of Vibration-free Concrete in View Accelerating Pavement Construction by Slipforming

Feys, Dimitri; Asghari, Azadehalsadat; Research on Concrete Applications for Sustainable Transportation (RE-CAST); Missouri University of Science and Technology

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Rapid Pavement Construction: Research on Thixotropy and Workability Loss of Vibration-free Concrete in View Accelerating Pavement Construction by Slipforming

2016-01-01
By Feys, Dimitri ; Asghari, Azadehalsadat

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Creators:

Feys, Dimitri ; Asghari, Azadehalsadat

Feys, Dimitri ; Asghari, Azadehalsadat Less -
Corporate Creators:

Research on Concrete Applications for Sustainable Transportation (RE-CAST) ; Missouri University of Science and Technology

Research on Concrete Applications for Sustainable Transportation (RE-CAST) ; Missouri University of Science and Technology Less -
Corporate Contributors:

United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. University Transportation Centers (UTC) Program

United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. University Transportation Centers (UTC) Program Less -
Subject/TRT Terms:

[+]

Cement Paste Paving Rheological Properties Rheology SCC Self Compacting Concrete Shear Stress Slipform Slip Form Paving Thixotropy Workability
Publication/ Report Number:

RECAST UTC #00049070
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final report, Period: 09/01/2014 – 12/31/15
Corporate Publisher:

Research on Concrete Applications for Sustainable Transportation (RE-CAST) (UTC)
Abstract:

This report describes a parametric study to better understand the changes in rheological properties of cement pastes with time and shearing energy. It includes the investigation of structural build-up at rest, the evolution of dynamic rheological properties with time and the breakdown generated by applying different levels of shearing. The main purpose of this research work is to generate a knowledge platform to facilitate research on tuning the rheological properties of self-consolidating concrete (SCC), making it suitable for slipforming. However, in this research work, another interesting research question was addressed simultaneously: how much does the applied rate of shear affect the breakdown of internal structure? A question which was stated by Wallevik when describing internal connections between cement particles: some connections are reversible, some are permanent, dependent on the amount of work applied to the system [3]. Similarly, Feys at al. had demonstrated some significant changes in viscosity in SCC induced by pumping [4]. These changes were hypothesized to be caused by additional shearing compared to the initial shearing conditions inside the concrete mixer. Inspired by the large-scale pumping testing procedure from Feys et al. [4] [5], a similar procedure was developed for cement pastes to investigate how the maximum applied shear rate affects the rheological properties. The procedure and results are summarized in this report, however, some inexplicable effects are still remaining after analysis. As a consequence, this report contains the description of the evolution of static and dynamic rheological properties of cement paste with time and the results of the shear-dependency, preceded by the utilized procedures and a short literature review on the basics of rheology of suspensions, cement pastes and their changes with time.
Format:

PDF
Funding:

USDOT: DTRT13-G-UTC45
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:6e4d34abfdbe40f48c3f56d4c9d732e1310d6af05b0c9b9152e201a60fca382c
Download URL:

https://rosap.ntl.bts.gov/view/dot/54399/dot_54399_DS1.pdf
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Rapid Pavement Construction: Research on Thixotropy and Workability Loss of Vibration-free Concrete in View Accelerating Pavement Construction by Slipforming

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