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Displaying 101 - 125 of 160

Effect of sample conditioning on the water absorption of concrete

August 1, 2011

Author(s)

Javier Castro, Dale P. Bentz, Jason Weiss

ASTM C1585 is commonly used to determine the absorption and rate of absorption of water in unsaturated hydraulic cement concretes. ASTM C1585 preconditions the samples for a total of 18 days. Unfortunately however, the range of relative humidities that can

Examining Capillary Depercolation in Cement-Based Materials: Measurement Techniques and Parameters which Influence their Interpretation

May 31, 2011

Author(s)

G Sant, Dale P. Bentz, Jason Weiss

The connectivity of the porosity in cement-based materials has an impact on material durability, the interpretation of experimental measurements such as chemical shrinkage, and the timing of curing operations. While several techniques have been used to

Effect of Initial Scarification and Overlay Treatment Timing on Chloride Concentrations in Concrete Bridge Decks

May 23, 2011

Author(s)

W. S. Guthrie, Curtis Nolan, Dale P. Bentz

Scarification and overlay (SO) procedures are often performed on concrete bridge decks to minimize the corrosion of reinforcing steel due to chloride ingress. Given the need to develop guidelines for the initial timing of SO treatments, the objectives of

Evaluation of Sustainable High-Volume Fly Ash Concretes

January 1, 2011

Author(s)

Alejandro Duran-Herrera, Cesar Juarez, P Valdez, Dale P. Bentz

This article presents results of an experimental research work oriented to develop practical tools for the regional concrete industry, as well as to illustrate the potential benefits of the synergistic effect of an ASTM C 618 Class F fly ash (FA) produced

A Dual Concentric Ring Test for Evaluating Residual Stress Development Due of Restrained Volume Change

September 1, 2010

Author(s)

John Schlitter, Andrew Senter, Dale P. Bentz, Tommy Nantung, Jason Weiss

The standard restrained ring test (ASTM 1581-04) is a simple, economical method to evaluate a concrete mixture s susceptibility of shrinkage cracking. Unfortunately, the test only provides restraint against samples that shrink and can not be used to

LWA Absorption and Desorption: The Influence on the Microstructure and Transport Properties of Internally Cured Mortars

September 1, 2010

Author(s)

Javier Castro, Ryan Henkensiefken, Tommy Nantung, Dale P. Bentz, Jason Weiss

The increased propensity for shrinkage cracking in low water-to-cement ratio (w/c) concrete has resulted in the development of new methods that can reduce the risk of early-age cracking, including internal curing. Internal curing can use water-filled

CT Measurements of SAP Voids in Concrete

August 15, 2010

Author(s)

Sara Laustsen, Dale P. Bentz, Marianne Hasholt, Ole M. Jensen

This paper describes how X-ray computed tomography (CT) scanning can be used to determine the void distribution in hardened concrete. Three different approaches are used to analyse a binary data set created from CT measurement. One approach classifies a

Planar Image-Based Reconstruction of Pervious Concrete Pore Structure and Permeability Prediction

July 1, 2010

Author(s)

Milani S. Sumanasooriya, Dale P. Bentz, Narayanan Neithalath

Transport properties of porous materials such as pervious concretes are inherently dependent on a variety of pore structure features. Empirical equations are typically used to relate the pore structure of a porous material to its permeability. In this

ADVANCES IN PORE STRUCTURE CHARACTERIZATION AND PERFORMANCE PREDICTION OF PERVIOUS CONCRETES

May 3, 2010

Author(s)

Narayanan Neithalath, Dale P. Bentz, Milani S. Sumanasooriya

Pervious concrete is receiving renewed interest as a sustainable construction material for parking lots, sidewalks, and low-traffic-volume roads. A key characteristic of this material is its coarse porosity, achieved by omitting the fine aggregates from a

The Influence of Shrinkage-Reducing Admixtures (SRAs) on Moisture Absorption in Cementitious Materials at Early Ages

March 1, 2010

Author(s)

G Sant, A Eberhardt, Dale P. Bentz, W Weiss

The water absorption behavior of cement pastes (w/c = 0.30) containing varying concentrations (i.e., 0 %, 0.2 % and 5 %) of a shrinkage reducing admixture (SRA) was measured. Moisture ingress was monitored using x-ray absorption. A decrease in both the

Plastic Shrinkage Cracking in Internally Cured Mixtures Made with Pre-wetted Lightweight Aggregate

February 1, 2010

Author(s)

Ryan Henkensiefken, Peter Briatka, Dale P. Bentz, Tommy Nantung, Jason Weiss

The incorporation of pre-wetted lightweight aggregates (LWA) has been used to reduce the shrinkage cracking associated with self-desiccation in the hardened state. Little research however exists which shows the influence of internal curing on the formation

Water Absorption in Internally Cured Mortar Made with Water-Filled Lightweight Aggregate

October 1, 2009

Author(s)

Ryan Henkensiefken, Javier Castro, Dale P. Bentz, Tommy Nantung, Jason Weiss

The increased propensity for shrinkage cracking in low w/c concrete has spawned the development of new technologies that can reduce the risk of early-age cracking. One of these is internal curing. Internal curing uses saturated lightweight aggregate to

Internal Curing Improves Concrete Performance throughout its Life

September 1, 2009

Author(s)

Ryan Henkensiefken, Javier Castro, Haejin Kim, Dale P. Bentz, Jason Weiss

Internal curing (IC) provides a set of water reservoirs within the concrete to prevent self-desiccation and promote hydration. While early research in this area focused on reductions in early-age deformation and cracking, recent efforts have demonstrated

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