[PDF] Tests For Freeze Thaw Durability Of Concrete Aggregates eBook

Author : RH. Vogler
Publisher :
Page : 10 pages
File Size : 23,87 MB
Release : 1989
Category : Coarse aggregate
ISBN :

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The procedures used to evaluate the durability of coarse aggregate in concrete by freezing and thawing were determined by a survey. Results indicate that a number of state transportation agencies use freeze-thaw procedures in place of, or in addition to, sulfate soundness and other tests. However, each agency's procedure has unique aspects. ASTM Test Method for Resistance of Concrete to Rapid Freezing and Thawing (C 666) describes the procedures for freeze-thaw cycling and gives partial information on expressing test results, but ASTM has no standard procedure to guide the testing agency in important aspects such as: aggregate grading, aggregate moisture treatment and pretreatment, and concrete mixture proportioning (including cement content, air content of concrete, or curing procedure). The ASTM C 666 method of expressing results for change in length does not permit comparison between different aggregates. The information in this paper is intended to assist ASTM Committee C9 on Concrete and Concrete Aggregates in preparing a practice for evaluation of coarse aggregate in concrete by freezing and thawing.

Author : National Research Council (U.S.). Highway Research Board
Publisher :
Page : 94 pages
File Size : 20,46 MB
Release : 1961
Category : Aggregates (Building materials)
ISBN :

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Paper 1: Results of a statewide experiment to compare the AE-55 air indicator for concrete with conventional pressure methods are presented. Paper 2: Describes a series of tests designed to determine the reliability of results, the feasibility of use, and the practical applications of the test hammer in construction control. Paper 4: In this study, pore characteristics, mineralogy, texture, and structure were determined for cherts and shales from nine Indiana glacial gravel deposits by means of microscopic petrography, x-ray diffraction, and the common specific gravity and absorption techniques.

Author : National Research Council (U.S.). Highway Research Board
Publisher :
Page : 48 pages
File Size : 40,56 MB
Release : 1956
Category : Aggregates (Building materials).
ISBN :

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Paper 1 presents laboratory freeze-thaw results as well as field observations on the major Michigan aggregate sources and is considered a first step in formulation of a policy regarding acceptance of future aggregates of unknown service behavior.

Author : J. Marchand
Publisher : CRC Press
Page : 323 pages
File Size : 26,50 MB
Release : 2004-03-01
Category : Architecture
ISBN : 0203627091

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Concrete durability in climates where freezing and thawing occurs is a continuing problem. It is particularly acute for highway and bridge structures, where de-icing salts are used to combat the effects of frost, snow and ice. These salts can cause damage to concrete and accelerate corrosion of reinforcements. This book presents the latest international research on this area, with contributions from North America and Europe which were presented at an international RILEM workshop.

Author : Virginia Polytechnic Institute
Publisher :
Page : 40 pages
File Size : 39,85 MB
Release : 1969
Category : Aggregates (Building materials)
ISBN :

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Investigation was conducted to develop a simple and fast test that could be used to identify aggregates that cause poor concrete performance when frozen. A one-cycle slow- freeze test was developed and evaluated by correlating results with the durability factor obtained from astm method c290 (the standard freezing and thawing test in water). The test method and testing procedures are presented in detail.

Author : Salman Sulaiman
Publisher :
Page : 158 pages
File Size : 30,68 MB
Release : 2016
Category : Aggregates (Building materials)
ISBN :

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Freezing and thawing cycles is one of the most damaging factors that affect the durability of concrete. The damages caused by the cyclic freeze-thaw action can be divided into two factors. The first factor is an increase in internal crack, which causes the loss in relative dynamic modulus (RDM) of the concrete and the second factor is surface scaling, which leads to weight loss of the concrete. In this study, the durability of concrete made by replacing natural coarse aggregates (NCA) with various percentages of recycled concrete aggregates (RCA). Also some tests have been conducted with the addition of air entraining admixture (AEA). Prior to mixing the concrete, both NCA and RCA were characterized to determine their suitability as a construction material. Concrete mixes consisting of 0, 20, 40, 60, 80, and 100% replacement (by weight) of NCA with RCA were prepared. The same concrete mixes were prepared again but with the addition of an air entraining admixtures (AEA). All specimens were tested for compressive strength after a curing period of 7, 14, and 28 days. The compressive strength of the concrete made with different percentage of RCA decreases as the percentage of RCA increases. After 28 days of curing, samples with 0, 40, and 100% replacement of NCA with RCA were placed in the freeze-thaw chamber along with 0, 20, 40, 60, 80, and 100% NCA replacement containing AEA. After several cycles of freezing and thawing; the RDM, change in weight and change in length were measured. In this study loss of RDM and weight loss were noticed, as the cyclic freeze-thaw increases. It has also been observed that concrete mixes containing AEA were still durable after 300 cycles of freezing and thawing; however, the specimens without AEA failed before 150 cycles.

Author : Donald J. Janssen
Publisher : Strategic Highway Research Program (Shrp)
Page : 228 pages
File Size : 31,53 MB
Release : 1994
Category : Technology & Engineering
ISBN :

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This study, aimed at improving the freeze-thaw resistance of concrete, consists of three parts. Part I evaluates parameters affecting the freeze-thaw durability of concrete. A modification of the existing standard of method for determining the durability factor of concrete specimens is proposed, and a new procedure for fundamental transverse frequency (used in durability factor calculations) has been developed. Part II focuses on developing better methods for identifying nondurable aggregates, and has resulted in a rapid new test based on the hydraulic fracture of aggregates. Part III describes field experiments to evaluate the freeze-thaw resistance of a number of specified concrete mixes and the use of sealants to mitigate D-cracking. Preliminary field performance results are presented.