Hydration behavior and strength development of mineral admixture incorporated calcium aluminate cements

Download

index.pdf

Date

2018

Author

Erkmen, Kadir Can

Metadata

Show full item record

Item Usage Stats

140
views

67
downloads

Calcium aluminate cements (CACs) have very high early strength and high early heat evolution. On the other hand, at relatively high ambient temperatures and humidity the hydration products may convert into other products of lower binding value and porous structure which result in lower strength at later ages. In order to prevent such strength losses mineral admixtures such as ground granulated blast furnace slag and fly ash may be incorporated in CACs. In this respect, the main goal of this study was to obtain mechanically stable binder combinations by incorporating these mineral admixtures into CAC. The effects of these mineral admixtures on the hydration process and strength development of CAC blended cement pastes and mortars at different curing temperatures were investigated through calorimetry, XRD and strength tests. The hydration reactions found to be happening significantly faster at elevated temperatures. The presence of a sufficient amount of GGBFS in the blends at different curing temperatures proved to be helpful in terms of hindering strength losses, however there is not such a clear effect observed in fly ash containing binders.

Subject Keywords

Cement, Calcium aluminate., Hydration., Fly ash.

URI

http://etd.lib.metu.edu.tr/upload/12622831/index.pdf
https://hdl.handle.net/11511/27831

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Compressive strength development of calcium aluminate cement-GGBFS blends Kirca, Onder; Yaman, İsmail Özgür; Tokyay, Mustafa (2013-01-01) The compressive strength development of calcium aluminate cement (CAC) and ground granulated blast furnace slag (GGBFS) blends that were subjected to different curing regimes are investigated. The blends had GGBFS/CAC ratios between 0% and 80%, by mass. Mortar specimens, prepared with a water:binder:sand ratio of 1:2:6, were subjected to seven different curing regimes and the compressive strengths were monitored up to 210 days. In order to understand the effect of temperature on compressive strength develop...
Influence of perlite addition on the strength development and thermal stability of calcium aluminate cement mortars Şengül, Kemal; Erdoğan, Sinan Turhan; Department of Civil Engineering (2018) Calcium aluminate cement is a special cement that reaches high strength in a short time but suffers a considerable loss of strength due to moisture and temperature-related conversion of metastable calcium aluminum hydrates. The study aimed to produce stratlingite as a stable hydration product to completely stop or reduce this chemical conversion using an inexpensive and abundant silica source. Ground perlite was chosen as the source of silica. Perlite was mixed with calcium aluminate cement in different pro...
Biomimetic preparation of HA precursors at 37 degrees C in urea- and enzyme urease-containing synthetic body fluids Bayraktar, D; Tas, AC (1999-12-01) An important inorganic phase of synthetic bone applications, calcium hydroxyapatite (HA, Ca-10(PO4)(6)(OH)(2)), was prepared as a single-phase and sub-micron bioceramic powder. Carbonated HA precursors were synthesized from calcium nitrate tetrahydrate and diammonium hydrogen phosphate salts dissolved in "synthetic body fluid" (SBF) solutions, containing urea (H2NCONH2) and enzyme urease, under the biomimetic conditions of 37 degrees C and pH 7.4, by using a novel chemical precipitation technique.
Algal alginate: A potential coagulant for drinking water treatment Devrimci, H. Aylin; Yuksel, A. Mete; Sanin, Faika Dilek (2012-08-01) Due to its gelling abilities, calcium alginate has been investigated in this work as a possible coagulant to be used in turbid water treatment. Sodium salts of commercially available alginic acid with low and high viscosities were used in the study. A standard jar test was conducted in 500 mL of synthetic turbid water samples with different initial turbidities of 150, 80 and 10 NTU. These samples were treated using different doses of calcium (varying between 30 and 200 mg/L) and alginate (varying between 0....
Dry sliding wear behaviour of Al-Fe-Si-V alloys at elevated temperatures Koraman, Emrah; Baydoğan, Murat; Sayilgan, Seda; Kalkanlı, Ali (2015-01-15) High temperature strength of Al-Fe-V-Si alloys due to quaternary silicide dispersoids in their microstructures has been well documented in the literature. In those works, these materials have been shown as promising candidates to compete with titanium alloys at elevated temperatures. However, there is a lack of information on elevated temperature wear behaviour of those materials, which should be one of the main considerations at elevated temperature use. In order to contribute to this field, dry sliding we...

Citation Formats

K. C. Erkmen, “Hydration behavior and strength development of mineral admixture incorporated calcium aluminate cements,” M.S. - Master of Science, Middle East Technical University, 2018.