Author: Martina Teresa DriscollPublisher:
ISBN:
Category :
Languages : en
Pages : 524
Book Description
The Deicer Salt Scaling Resistance of Slag Cement Concrete
Author: Martina Teresa DriscollPublisher:
ISBN:
Category :
Languages : en
Pages : 524
Book Description
Deicer Scaling Resistance of Concrete Pavements, Bridge Decks, and Other Structures Containing Slag Cement, Phase I
Author: Scott Michael SchlorholtzPublisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 122
Book Description
The initial phase of this project was conducted to determine whether adding slag cement to concrete mixtures increases the surface scaling caused by the routine application of deicer salt. A total of 28 field sites that included portland cement concrete pavements and bridge decks containing slag cement were evaluated. Laboratory testing was conducted on 6 in. diameter core samples extracted from 12 field sites and 3 subsites, including 6 pavement sites and 6 bridge decks. The laboratory testing program consisted of scaling tests, rapid chloride permeability tests, surface chloride profile tests, and petrographic examination. The results of this study suggest that construction-related issues played a bigger role in the observed scaling performance than did the amount of slag in the concrete mixture. For the scaling tests, only cores extracted from one site exhibited scaling mass loss values that exceeded 1.5 lbs/yd2. It was also noted that the bridge deck cores tended to lose more mass during the scaling tests than the pavement cores. For the rapid chloride permeability tests, the amount of charge passed did not appear to be directly related to the amount of slag in the mixtures. However, the different ages of the concrete at the various sites tended to complicate the interpretation of the test results. For the surface chloride profile tests, the diffusion coefficients estimated for the various samples ranged from about 5.6E-12 m2/s to 1.4E-13 m2/s. Petrographic examinations indicated that four of the seven sites that exhibited scaling showed evidence of retempering. In addition, two of the scaling sites tended to have significantly higher water-cementitious material ratios than was expected from the nominal mixture design information that was provided.
Deicer Scaling Resistance of Concrete Mixtures Containing Slag Cement Phase 2
Author: R. Doug HootonPublisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 60
Book Description
With the use of supplementary cementing materials (SCMs) in concrete mixtures, salt scaling tests such as ASTM C672 have been found to be overly aggressive and do correlate well with field scaling performance. The reasons for this are thought to be because at high replacement levels, SCM mixtures can take longer to set and to develop their properties: neither of these factors is taken into account in the standard laboratory finishing and curing procedures. As a result, these variables were studied as well as a modified scaling test, based on the Quebec BNQ scaling test that had shown promise in other research. The experimental research focused on the evaluation of three scaling resistance tests, including the ASTM C672 test with normal curing as well as an accelerated curing regime used by VDOT for ASTM C1202 rapid chloride permeability tests and now included as an option in ASTM C1202. As well, several variations on the proposed draft ASTM WK9367 deicer scaling resistance test, based on the Quebec Ministry of Transportation BNQ test method, were evaluated for concretes containing varying amounts of slag cement. A total of 16 concrete mixtures were studied using both high alkali cement and low alkali cement, Grade 100 slag and Grade 120 slag with 0, 20, 35 and 50 percent slag replacement by mass of total cementing materials. Vinsol resin was used as the primary air entrainer and Micro Air® was used in two replicate mixes for comparison. Based on the results of this study, a draft alternative test method to ASTM C762 is proposed.
Deicer Scaling Resistance of Concrete Containing Slag Cement
Author: Irene K. LaBarcaFurther Investigations Into the Deicer Scaling of Slag Cement Concrete with Emphasis on Surface Properties
Author: Gopalan NarayananEvaluation of Test Methods for De-Icer Scaling Resistance of Concrete
Author: Dimitre Georgiev VassilevPublisher:
ISBN: 9780494930618
Category :
Languages : en
Pages :
Book Description
Durability of Slag Cement Concretes Exposed to Freezing and Thawing in the Presence of Deicers
Author: Maria I. FalconiEffects of Ground Granulated Blast Furnace Slag in Portland Cement Concrete
Author: Irene K. LaBarcaPublisher:
ISBN:
Category : Portland cement
Languages : en
Pages : 98
Book Description
This research examined the properties of concrete containing grade 120 slag cement at replacement levels of 0%, 30%, and 50%. The primary concrete properties studied were compressive strength, split-tensile strength, and deicer scaling resistance. Material variations included four sources of ordinary portland cement and two types of coarse aggregate. Strength properties were studied at room temperature and 40°F mix and curing conditions. Deicer scaling resistance was studied for concrete cured under six curing conditions. Carbonation of concrete cured under these six conditions was also investigated.
Freeze-Thaw Durability of Concrete
Author: J. MarchandPublisher: CRC Press
ISBN: 0203627091
Category : Architecture
Languages : en
Pages : 323
Book Description
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: Reza Mohammadi Ahani