Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Styrene-butadiene polymer action on compressive and tensile strengths of cement mortars
Abstract This paper reports the results of an experimental investigation into the action of styrene-butadiene (SB) polymer on the mechanical properties of polymer cement mortars (PCM), comparing the results with the requirements specified in EN 1504-3 [Products and systems for the protection and repair of concrete structures—definitions, requirements, quality control and evaluation of conformity—part 3: structural and non-structural repair, CEN, 2005]. Setting times, shrinkage, elasticity modulus and the microstructure building in PCM are also characterised. Tests performed on PCM confirmed the beneficial action of polymers on tensile strength and, in particular, on flexural strength of cement mortars, whereas in compressive strength, a reduction, at earlier ages, was observed. It is considered that this mechanical behaviour results from the polymer action on the atrophy of hydrated Ca(OH)2 crystals and on the reduction in the density of microcracks in the paste–aggregate interface, which leads to the noticeable improvement in flexural and tensile strengths. On the other hand, the smaller contribution of the beneficial action of the polymer on the compressive strength, together with the delay in cement hydration and with the increase in the closed porosity of PCM, are the main causes for the reduction in the compressive strength during the first months.
Styrene-butadiene polymer action on compressive and tensile strengths of cement mortars
Abstract This paper reports the results of an experimental investigation into the action of styrene-butadiene (SB) polymer on the mechanical properties of polymer cement mortars (PCM), comparing the results with the requirements specified in EN 1504-3 [Products and systems for the protection and repair of concrete structures—definitions, requirements, quality control and evaluation of conformity—part 3: structural and non-structural repair, CEN, 2005]. Setting times, shrinkage, elasticity modulus and the microstructure building in PCM are also characterised. Tests performed on PCM confirmed the beneficial action of polymers on tensile strength and, in particular, on flexural strength of cement mortars, whereas in compressive strength, a reduction, at earlier ages, was observed. It is considered that this mechanical behaviour results from the polymer action on the atrophy of hydrated Ca(OH)2 crystals and on the reduction in the density of microcracks in the paste–aggregate interface, which leads to the noticeable improvement in flexural and tensile strengths. On the other hand, the smaller contribution of the beneficial action of the polymer on the compressive strength, together with the delay in cement hydration and with the increase in the closed porosity of PCM, are the main causes for the reduction in the compressive strength during the first months.
Styrene-butadiene polymer action on compressive and tensile strengths of cement mortars
Ribeiro, Maria Sofia Sousa (Autor:in) / Gonçalves, Arlindo Freitas (Autor:in) / Branco, Fernando António Baptista (Autor:in)
2007
Aufsatz (Zeitschrift)
Englisch
Styrene-butadiene polymer action on compressive and tensile strengths of cement mortars
| Online Contents | 2008
Styrene-butadiene polymer action on compressive and tensile strengths of cement mortars
| British Library Online Contents | 2008
Styrene-butadiene polymer action on compressive and tensile strengths of cement mortars
| Online Contents | 2007
Styrene-butadiene polymer action on compressive and tensile strengths of cement mortars
| Springer Verlag | 2007