Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of nano-silica on rheology and fresh properties of cement pastes and mortars
AbstractAmorphous nano-silica (nS) particles (0–2.5wt%) by cement were incorporated in cement pastes and mortars, and their effect on the fresh state behaviour was analysed. Rheological tests showed that after 75min from the mixing start, the mortar having 2.5wt% nS shows insufficient flowability to allow its continuous monitoring in a Viskomat PC viscometer. The influence of nS content was better observed on yield stress when compared with plastic viscosity values (the first increased about 66.5% while the latter just increased 3.6%). With nS addition, spread, setting time and the moment to reach the maximum temperature decreased 33%, 60% and 51.3%, respectively, when compared with samples without nS. X-ray diffraction showed presence of calcium hydroxide after 9h in the sample with 2.5 wt% nS. The air content increased 79% and apparent density decreased 2.4% when nS was added.
Effect of nano-silica on rheology and fresh properties of cement pastes and mortars
AbstractAmorphous nano-silica (nS) particles (0–2.5wt%) by cement were incorporated in cement pastes and mortars, and their effect on the fresh state behaviour was analysed. Rheological tests showed that after 75min from the mixing start, the mortar having 2.5wt% nS shows insufficient flowability to allow its continuous monitoring in a Viskomat PC viscometer. The influence of nS content was better observed on yield stress when compared with plastic viscosity values (the first increased about 66.5% while the latter just increased 3.6%). With nS addition, spread, setting time and the moment to reach the maximum temperature decreased 33%, 60% and 51.3%, respectively, when compared with samples without nS. X-ray diffraction showed presence of calcium hydroxide after 9h in the sample with 2.5 wt% nS. The air content increased 79% and apparent density decreased 2.4% when nS was added.
Effect of nano-silica on rheology and fresh properties of cement pastes and mortars
Senff, Luciano (Autor:in) / Labrincha, João A. (Autor:in) / Ferreira, Victor M. (Autor:in) / Hotza, Dachamir (Autor:in) / Repette, Wellington L. (Autor:in)
Construction and Building Materials ; 23 ; 2487-2491
08.02.2009
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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