Study on the addition effect of metakaolin and mechanically activated kaolin on cement strength and microstructure under different curing conditions
Само за регистроване кориснике
2017
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
The effects of thermally (MK) or mechanically activated kaolin (AK) on the compressive strength of mortars and microstructure of pastes were investigated. Mortar mixtures, in which 10%, 20% and 30% of ordinary Portland cement (OPC) was replaced by either MK or AK, were prepared (w/b of 0.5) and ordinary (age 2, 28 or 90 days) and autoclave cured. Hydration products were determined by X-ray diffraction (XRD) and differential thermal analysis/thermal gravimetry (DTA/TG) analysis, while microstructure was investigated by mercury intrusion porosimetry (MIP). MK substitution increases the compressive strength of ordinary-cured mortars, as a result of the higher content of reactive silica that caused more pronounced pozzolanic reaction, as well as by effective refinement of their pore structure. Positive effects on the compressive strength could be achieved up to 30% substitution of OPC by MK The OPC substitution by AK resulted in lower strengths of ordinary-cured mortars, compared to both M...K mortars and reference. Higher specific surface area and finer particles of AK were insufficient to compensate, through filler effect, lower pozzolanic reaction and additional negative influence of the kaolinite presence. The highest compressive strength was obtained for mortar with 10% of AK (relative strength of 94%). In comparison to the reference, autoclaved MK and AK mortars, exhibited lower compressive strength, as a consequence of increasing the hydrogarnet formation, instead of tobermorite. The highest strength was achieved for mortar with 10% of AK.
Кључне речи:
Ordinary curing / Metakaolin / Mechanically activated kaolin / Autoclave curingИзвор:
Construction and Building Materials, 2017, 133, 243-252Издавач:
- Elsevier Sci Ltd, Oxford
Финансирање / пројекти:
- Истраживање могућности примене отпадних и рециклираних материјала у бетонским композитима, са оценом утицаја на животну средину, у циљу промоције одрживог грађевинарства у србији (RS-MESTD-Technological Development (TD or TR)-36017)
- Наноструктурни функционални и композитни материјали у каталитичким и сорпционим процесима (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45001)
DOI: 10.1016/j.conbuildmat.2016.12.068
ISSN: 0950-0618
WoS: 000393002800026
Scopus: 2-s2.0-85006966256
Институција/група
Institut za ispitivanje materijalaTY - JOUR AU - Ilić, Biljana AU - Radonjanin, Vlastimir AU - Malešev, Mirjana AU - Zdujić, Miodrag AU - Mitrović, Aleksandra PY - 2017 UR - http://rims.institutims.rs/handle/123456789/312 AB - The effects of thermally (MK) or mechanically activated kaolin (AK) on the compressive strength of mortars and microstructure of pastes were investigated. Mortar mixtures, in which 10%, 20% and 30% of ordinary Portland cement (OPC) was replaced by either MK or AK, were prepared (w/b of 0.5) and ordinary (age 2, 28 or 90 days) and autoclave cured. Hydration products were determined by X-ray diffraction (XRD) and differential thermal analysis/thermal gravimetry (DTA/TG) analysis, while microstructure was investigated by mercury intrusion porosimetry (MIP). MK substitution increases the compressive strength of ordinary-cured mortars, as a result of the higher content of reactive silica that caused more pronounced pozzolanic reaction, as well as by effective refinement of their pore structure. Positive effects on the compressive strength could be achieved up to 30% substitution of OPC by MK The OPC substitution by AK resulted in lower strengths of ordinary-cured mortars, compared to both MK mortars and reference. Higher specific surface area and finer particles of AK were insufficient to compensate, through filler effect, lower pozzolanic reaction and additional negative influence of the kaolinite presence. The highest compressive strength was obtained for mortar with 10% of AK (relative strength of 94%). In comparison to the reference, autoclaved MK and AK mortars, exhibited lower compressive strength, as a consequence of increasing the hydrogarnet formation, instead of tobermorite. The highest strength was achieved for mortar with 10% of AK. PB - Elsevier Sci Ltd, Oxford T2 - Construction and Building Materials T1 - Study on the addition effect of metakaolin and mechanically activated kaolin on cement strength and microstructure under different curing conditions EP - 252 SP - 243 VL - 133 DO - 10.1016/j.conbuildmat.2016.12.068 ER -
@article{ author = "Ilić, Biljana and Radonjanin, Vlastimir and Malešev, Mirjana and Zdujić, Miodrag and Mitrović, Aleksandra", year = "2017", abstract = "The effects of thermally (MK) or mechanically activated kaolin (AK) on the compressive strength of mortars and microstructure of pastes were investigated. Mortar mixtures, in which 10%, 20% and 30% of ordinary Portland cement (OPC) was replaced by either MK or AK, were prepared (w/b of 0.5) and ordinary (age 2, 28 or 90 days) and autoclave cured. Hydration products were determined by X-ray diffraction (XRD) and differential thermal analysis/thermal gravimetry (DTA/TG) analysis, while microstructure was investigated by mercury intrusion porosimetry (MIP). MK substitution increases the compressive strength of ordinary-cured mortars, as a result of the higher content of reactive silica that caused more pronounced pozzolanic reaction, as well as by effective refinement of their pore structure. Positive effects on the compressive strength could be achieved up to 30% substitution of OPC by MK The OPC substitution by AK resulted in lower strengths of ordinary-cured mortars, compared to both MK mortars and reference. Higher specific surface area and finer particles of AK were insufficient to compensate, through filler effect, lower pozzolanic reaction and additional negative influence of the kaolinite presence. The highest compressive strength was obtained for mortar with 10% of AK (relative strength of 94%). In comparison to the reference, autoclaved MK and AK mortars, exhibited lower compressive strength, as a consequence of increasing the hydrogarnet formation, instead of tobermorite. The highest strength was achieved for mortar with 10% of AK.", publisher = "Elsevier Sci Ltd, Oxford", journal = "Construction and Building Materials", title = "Study on the addition effect of metakaolin and mechanically activated kaolin on cement strength and microstructure under different curing conditions", pages = "252-243", volume = "133", doi = "10.1016/j.conbuildmat.2016.12.068" }
Ilić, B., Radonjanin, V., Malešev, M., Zdujić, M.,& Mitrović, A.. (2017). Study on the addition effect of metakaolin and mechanically activated kaolin on cement strength and microstructure under different curing conditions. in Construction and Building Materials Elsevier Sci Ltd, Oxford., 133, 243-252. https://doi.org/10.1016/j.conbuildmat.2016.12.068
Ilić B, Radonjanin V, Malešev M, Zdujić M, Mitrović A. Study on the addition effect of metakaolin and mechanically activated kaolin on cement strength and microstructure under different curing conditions. in Construction and Building Materials. 2017;133:243-252. doi:10.1016/j.conbuildmat.2016.12.068 .
Ilić, Biljana, Radonjanin, Vlastimir, Malešev, Mirjana, Zdujić, Miodrag, Mitrović, Aleksandra, "Study on the addition effect of metakaolin and mechanically activated kaolin on cement strength and microstructure under different curing conditions" in Construction and Building Materials, 133 (2017):243-252, https://doi.org/10.1016/j.conbuildmat.2016.12.068 . .