Freeze–thaw resistance of normal strength powder concretes

Autor: Vesa Penttala, Andrzej Cwirzen, Johanna Tikkanen

Publikováno v: Magazine of Concrete Research. 67:71-81

The effects of mineral powders on scaling, water absorption and internal deterioration of concretes are studied. Properties of a reference concrete produced with Portland cement are compared with corresponding mineral powder concretes. In the mineral

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dade0a135b6c6e7ca8dbd6d992a17eea
https://doi.org/10.1680/macr.14.00140

The effect of limestone on sodium hydroxide-activated metakaolin-based geopolymers

Autor: Vesa Penttala, Karin Habermehl-Cwirzen, John L. Provis, Andrzej Cwirzen

Publikováno v: Construction and Building Materials. 66:53-62

Blends of metakaolin and limestone can be alkali-activated with NaOH to form solid binders, which show relatively low strength but offer potential as a model system by which the reaction processes of more complex systems can be better understood. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::afc3cd439d004f47155a5d45f4440512
https://doi.org/10.1016/j.conbuildmat.2014.05.022

Direct Synthesis of Carbon Nanofibers on Cement Particles

Autor: Ying Tian, Karin Habermehl-Cwirzen, Andrzej Cwirzen, Esko I. Kauppinen, Sergey D. Shandakov, Oleg V. Tolochko, Ekaterina S. Vasilieva, Albert G. Nasibulin, Maarit Karppinen, Vesa Penttala, Prasantha R. Mudimela, Tatiana S. Koltsova, Jari Malm, Ilya V. Anoshkin, Larisa I. Nasibulina

Publikováno v: Nasibulina, L I, Anoshkin, I V, Shandakov, S V, Nasibulin, A G, Cwirzen, A, Mudimela, P R, Habermehl-Cwirzen, K, Malm, J E M, Koltsova, T S, Tian, Y, Vasilieva, E S, Penttala, V, Tolochko, O V, Karppinen, M J & Kauppinen, E I 2010, ' Direct synthesis of carbon nanofibers on cement particles ', Transportation Research Record, vol. 2142, no. 1, pp. 96-101 . https://doi.org/10.3141/2142-14

Carbon nanotubes (CNTs) and nanofibers (CNFs) are promising candidates for the next generation of high-performance structural and multifunctional composite materials. One of the largest obstacles to creating strong, electrically or thermally conducti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb23bda19d3bf0aa7ca6f6f8857aa74c
https://doi.org/10.3141/2142-14

SEM/AFM studies of cementitious binder modified by MWCNT and nano-sized Fe needles

Autor: Albert G. Nasibulin, Vesa Penttala, Andrzej Cwirzen, Prasantha R. Mudimela, Karin Habermehl-Cwirzen, E.I. Kaupinen

Publikováno v: Materials Characterization. 60:735-740

Several compositions of cement paste samples containing multiwalled carbon nanotubes were produced using a small-size vacuum mixer. The mixes had water-to-binder ratios of 0.25 and 0.3. Sulfate resistant cement has been used. The multiwalled carbon n

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cfe8c4c02bdca35db94a39e5666fa195
https://doi.org/10.1016/j.matchar.2008.11.001

Surface decoration of carbon nanotubes and mechanical properties of cement/carbon nanotube composites

Autor: Vesa Penttala, Andrzej Cwirzen, Karin Habermehl-Cwirzen

Publikováno v: Advances in Cement Research. 20:65-73

The present study investigated the effects of the method of surface decoration on the wetability of multi-walled carbon nanotubes (MWCNTs) and the mechanical properties of the cement paste incorporating these dispersions. The results showed that stab

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2f0eec23b2acb2405c26d0ee46b7c748
https://doi.org/10.1680/adcr.2008.20.2.65