Nowe, skuteczne, ognioodporne spoiwo cementowo-metakaolinowe

• Autorzy: Shebl S. S.

Warianty tytułu

EN

Development of new efficient premixed blended metakaolin-cementitious fireproofing compounds

• Języki publikacji: PL

Abstrakty

PL

Praca dotyczy zabezpieczenia konstrukcji stalowych przed zniszczeniem pod działaniem ognia. Zastosowano w tym celu zaprawę ognioodporną z dodatkiem różnych wypełniaczy lekkich. Zbadano materiały zawierajace zmienne zawartości perlitu, wermikulitu, wełny mineralnej. W spoiwie zastąpiono 10% cementu portlandzkiego (OPC) aktywowanym termicznie metakaolinem (MK), co dało w efekcie zwiekszenie wytrzymałości i trwałości. Jako materiał porównawczy zastosowano znany produkt handlowy o nazwie Fendolit MIl. Jest to gotowa mieszanka złożona głównie z wermikulitu i cementu portlandzkiego, do aplikacji metodą natryskową. Stosując mieszane spoiwo cementowo-metakaolinowe i vermikulit w postaci proszku uzyskano wzrost wytrzymałości o 168% w porównaniu z wytrzymałością Fendolitu Mil. Badania ognioodporności przeprowadzono według normy ASTM E 119-07. Zachowanie materiału określa się mierząc czas ekspozycji, po którym próbka wykazuje symptomy zniszczenia. Zaobserwowano poprawę ognioodporności po wprowadzeniu różnych ilości lekkiego wypełniacza do spoiwa cementowo-metakaolinowego. Zmiana właściwości wynosi około 50%, 58% i 26% dla kompozytów z wypełniaczami lekkimi w postaci wermikulitu, wełny mineralnej i perlitu w stosunku do ognioodporności Fendolitu MIl przyjętej za jednostkę. Optymalny udział masowy lekkiego wypełniacza w stosunku do masy spoiwa wynosi 1,25 - 1,5.

EN

This study evaluates the effect of fireproofing of steel structures as one of the available options to control structure collapse. Attempting to develop fireproofing cementitious compounds with longest fire resistance rating at sufficient mechanical properties is also aimed. Different lightweight aggregates were used to adding to cement paste producing a new efficient premixed fireproofing cementitious materials. Perlite as beads form, vermiculite as powder form, and rockwool as fibers form had been used with different loading ratios. A replacement of ordinary Portland cement (OPC) by thermally activated metakaolin (MK) by a ratio of 10% was made to increases its mechanical strength and durability. Famous common commercial product called Fendolit MII was used for comparison purposes. It is a spray applied, single package factory controlled premix, based on vermiculite and Portland cement. An improvement of the compressive strength of about 168% of blended MK-cement compound with vermiculite lightweight aggregate as powder form based on unit compressive strength of the Fendolit MII was observed. ASTM E119-07 is used to measure and describe the response and resistance of fireproofing cementitious compounds to fire under controlled conditions. Performance is defined as the period of resistance to standard exposure elapsing before the first critical point in behavior is observed. An improvement in the fire resistances of the blended MK-cement compound with different loadings of lightweight aggregates was achieved. It reaches to about 50%, 58%, and 26% based on unit fire resistance result of the Fendolit MII respectively, with loading of vermiculite, rockwool, and perlit lightweight aggregate respectively. Also, the optimum loading of lightweight aggregate of blended MK-cement compound is 1.25-1.5.

Słowa kluczowe

PL

spoiwo cementowo-metakaolinowe; tworzywo ogniotrwałe; wypełniacz lekki; perlit; wermikulit; włókno mineralne

EN

cement-metakaolin binder; fireproofing compound; lightweight filler; perlite; vermiculite; mineral fiber

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2010
• Tom: R. 15/77, nr 5
• Strony: 279--288
• Opis fizyczny: Bibliogr. 18 poz., il.

Twórcy

autor

Shebl S. S.

• Building Physics Institute, Housing and Building National Research Center (HBRC), Cairo, Egypt

Bibliografia

• 1. www.cafcointl.com, cafco international, passive fire protection, hydrocarbon, Issue 7, May 2006.
• 2. ASTM E119-07, Standard Test Methods for Fire Tests of Building Construction and Materials, 2007.
• 3. API PUBL2218, „Fireproofing Practices in Petroleum and Petrochemical Processing Plants”, 1999.
• 4. BS 476 part 22, „Fire tests on building materials and structures; Methods for determination of the fire resistance of non-load bearing elements of construction”, 1987.
• 5. DIN 4102 part 3, „Fire Behavior of Building Materials and Building Components; Fire Walls and Non-load-bearing External Walls; Definitions, Requirements and Tests” 1977.
• 6. M. S. Morsy, S. S. Shebl, M. Abd El Gawad Saif, „Development of Perlite-Gypsum-Slag-Lime Sludge-Composite system for building application”, Building Research Journal, Vol. 56, Number 1, pp. 49-58 (2008).
• 7. A. Mladenovic, J. S. Suput, V. Ducman, A. S. Skapin, „Alkali-silica reactivity of some frequently used lightweight aggregates”, Cement and Concrete Research. Vol. 34. pp. 1809-1816 (2004).
• 8. X. Mo, B, Fournier, „Investigation of structural properties associated with alkali-silica reaction by means of macro- and micro-structural analysis”, Materials Characterization, Vol. 58, pp. 179-189 (2007).
• 9. J. Zelic, D. Rusic, D. Veza, R. Krstulovic, „The role of silica fume in the kinetics and mechanisms during the early stage of cement hydration”, Cement and Concrete Research, Vol. 30, Issue 10, pp. 1655-1662 (2000).
• 10. M.S. Morsy, A. M. Rashad, S. S. Shebl, „Effect of elevated temperature on compressive strength of blended cement mortar”, Building Research Journal, Vol. 56, No.2-3, pp. 173-185, (2008).
• 11. W. Sha, „Differential scanning calorimetry study of the hydration products in Portland cement pastes with metakaolin replacement” Proc. of the Int. Conf. on Advances in Building Technology, Hong Kong, China, pp. 881-888, 4-6 Dec. 2002.
• 12. C.S.Poon, L. Lam, S.C. Kou, Y. L Wong, R. Wong, „Rate of pozzolanic reaction of metakaolin in high-performance cement pastes”, Cement and Concrete Research, Vol. 31, Issue 9, pp. 1301-1306 (2001).
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• 15. M. S. Morsy, S. S. Shebl, „Effect of Silica Fume and Metakaoline Pozzolana on the Performance of Blended Cement Pastes against Fire”, Ceramics Silikaty, Vol. 51, No. 1, pp. 40-44 (2007).
• 16. A. K. Parande, B. R. Babu, M. A. Karthik, K. K. D. Kumaar, N. Palaniswamy” Study on strength and corrosion performance for steel embedded in metakaolin blended concrete/mortar”, Construction and Building Materials, Vol. 22, Issue 3, pp. 127-134 (2008).
• 17. G. F. Peng, Z. S. Huang, „Change in microstructure of hardened cement paste subjected to elevated temperatures”, Construction and Building Materials, Vol. 22, Issue 4, pp. 593-599, (2008).
• 18. Y. N. Chan, G. F. Peng, and M. Anson, „fire behavior of high performance concrete made with silica fume at various moisture content”, ACI material Journal, Vol. 96, pp. 405-409 (1999).