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Turkey has important potential pumices reserves (68% of the reserve of the world) and 56 % of pumice reserve of Turkey is in the East Anatolia Region. It is important to assess huge pumice reserves in Eastern Turkey for its use in the cement and concrete industry. Use of acidic pumice and basic pumice (scoria) as cement additive or aggregate are gaining popularity because of their proven structural/durability properties. This paper presents the results of an investigation to assess the effectiveness of pumice and scoria aggregates in controlling alkali silica reaction (ASR) of alkali silica reactive aggregate using the following test methods: the accelerated mortar bar test (ASTM C 1260) and the scanning electron microscopy technique (SEM). The morphologies, structures and properties of the samples were determined by XRD, ICP-MS, XRF and thin section study. Mortar cubes were specially prepared according to ASTM standards using 10, 20 and 30% pumice or scoria aggregate as alkali silica reactive aggregate replacement. The results are compared with ASTM requirements to assess the suitability of pumice or scoria for preventing alkali silica reactivity. According to the results of these methods, pumice aggregates control the alkali silica reaction whereas scoria aggregates decrease expansion but is not as effective as pumice in preventing ASR. The results of SEM analysis showed alkali silica gel formation and serious decomposition of aggregate texture due to ASR in scoria added mortar bars.
Słowa kluczowe
Rocznik
Tom
Strony
467--475
Opis fizyczny
Bibliogr. 12 poz., rys., tab.
Twórcy
autor
- Natural Resources of Van Lake Basin Research and Application Center, Yuzuncu Yil University, Zeve Campus, 65080 Van, Turkey
Bibliografia
- 1. ASTM C-1260-94. Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method), Concrete and Mineral Aggregates, American Society for Testing and Materials, USA, 1994; 4(2): 650-653.
- 2. ASTM C 618–08a. Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete. ASTM. 2008.
- 3. ASTM C150-02. Standard specification for Portland cement. Annual book of ASTM standards, West Conshohocken, PA: ASTM, 2002; vol. 04.02.
- 4. Cement and Concrete Association of New Zealand, Technical Report 3, Alkali Silica Reaction, Minimising the Risk of Damage to Concrete Guidance Notes and Recommended Practice (Second Edition), ISBN: 0908956185.
- 5. DAVRAZ M., GUNDUZ L., Reduction of alkali silica reaction risk in concrete by natural (micronised) amorphous silica. Construction and Building Materials. 2008; 22: 1093-1099.
- 6. INESON P.R., Siliceous components in aggregates. Cement and Concrete Composites 1990; 12(3): 185-190.
- 7. LE BAS M.J., LE MAITRE R.W., STRECKEISEN A, ZANETTIN B., A chemical classification of volcanic rocks based on the total alkali–silica diagram. Journal of Petrology. 1986; 27: 745–750.
- 8. OYAN V, KESKIN M, LEBEDEV AV, SHARKOV E, CHUGAEV A.., Importance of Assimilation Combined With Fractional Crystallization (AFC) and Magma Mixing Processes in The Magmatic Evolution of The Pliocene Etrusk Volcano, Northeast of Lake Van, E Turkey. 64th Geological Congress of Turkey, Ankara, 2011;162-164.
- 9. OYAN V., Etrüsk Volkanı ve Çevresinin (Van Gölü Kuzeyi) Volkanostratigraifisi, Petrolojisi ve Magmatik Evrimi. PHD, Yuzuncu Yil University, Van, 2011, p.352.
- 10. RHOADES R., Discussion of a paper by Stanton, Porter, Meder and Nicol, California experience with the expansion of concrete through reaction between cement and aggregate. J. Am. Concrete Inst. Proc. 1942, 38: 7–11.
- 11. SAGLIK A., 2009. Alkali-Silica Reactivity and Activation of ground Perlite-Containing Cementitious Mixtures, MSc, Graduate School of Natural and Applied Sciences of METU.
- 12. TAYLOR G.D., Construction Materials. London: Longman Scientific & Technical Publications; 1991.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-e6dcabbe-0188-42dd-b4f0-ebc4135fa426