Investigation of the Relationship Between Formation Factor and Fresh Properties of Concrete

Isgor, O Burkan; Sallehi, Hossein; Ghods, Pouria; Pacific Northwest Transportation Consortium (PacTrans) (UTC); University of Washington. University Transportation Center for Region 10; Natural Sciences and Engineering Research Council of Canada

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Investigation of the Relationship Between Formation Factor and Fresh Properties of Concrete

2017-11-30
By Isgor, O Burkan ; Sallehi, Hossein ; Ghods, Pouria

[PDF-635.11 KB]

English

Details You May Also Like

Details:

Creators:

Isgor, O Burkan ; Sallehi, Hossein ; Ghods, Pouria

Isgor, O Burkan ; Sallehi, Hossein ; Ghods, Pouria Less -
Corporate Creators:

Pacific Northwest Transportation Consortium (PacTrans) (UTC) ; University of Washington. University Transportation Center for Region 10 ; Natural Sciences and Engineering Research Council of Canada

Pacific Northwest Transportation Consortium (PacTrans) (UTC) ; University of Washington. University Transportation Center for Region 10 ; Natural Sciences and Engineering Research Council of Canada Less -
Corporate Contributors:

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 ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology Less -
Subject/TRT Terms:

[+]

Admixtures Binders Cement Cement Paste Electrical Resistivity Fresh Concrete Plasticizers Porosity Tortuosity
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final report
Corporate Publisher:

Pacific Northwest Transportation Consortium (PacTrans) (UTC) ; University of Washington. University Transportation Center for Region 10

Pacific Northwest Transportation Consortium (PacTrans) (UTC) ; University of Washington. University Transportation Center for Region 10 Less -
Abstract:

Formation factor of fresh cementitious pastes was investigated experimentally as a function of time from initial mixing and mixture design properties such as supplementary cementitious material (SCM) replacement level, water-to-binder ratio (w/cm), and superplasticizer dosage. SCM types included fly ash, slag and silica fume. A total of 54 paste mixtures were studied. The formation factor of each fresh paste was determined at the 30th, 60th, and 90th minutes from initial mixing. It was shown that for a given type of paste mixture (e.g. OPC plus silica fume), formation factor decreases if porosity or w/cm ratio increases, and this relationship can be well formulized by a power function. Although both paste and pore solution resistivity decrease with time in fresh cement paste mixtures until initial setting, their ratio (formation factor) remains relatively constant because it is only indicative of physical formation of solid particles in the pore solution. Formation factor of fresh cement paste is strongly correlated to its porosity through Archie's law, which implies that formation factor decreases if porosity increases. This decrease of formation factor is attributed to the smaller solid particles fraction (i.e., 1-φ) with high resistivity (i.e., lower amount of non-conductive component compared to conductive component). The tortuosity of paste affects the formation factor even at a constant porosity. Smaller size, angular shape, and more even distribution of particles increase the tortuosity of the paste. Slag and fly ash particles considerably decrease tortuosity; whereas silica fume incorporated pastes have almost the same tortuosity as OPC pastes. Superplasticizer addition significantly increases tortuosity through a better distribution of solid particles.
Format:

PDF
Collection(s):

University Transportation Centers
Main Document Checksum:

[+]

urn:sha256:a6c8d581ff585a3c0310577f23994a04d4190f929d288d288743d5ad766e16aa
Download URL:

https://rosap.ntl.bts.gov/view/dot/63419/dot_63419_DS1.pdf
File Type:

No Additional Files

More +

Investigation of the Relationship Between Formation Factor and Fresh Properties of Concrete

Details:

Supporting Files

You May Also Like