Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

During the last decades, innovative concrete applications have been the result of technological developments as new processing techniques, the use of concrete admixtures and advanced materials. All these improvements increase the demand for better performing concrete with enhanced workability. However, the lack of reliable engineering tools in traditional concrete production methods has led to some inconsistent control of the workability. Therefore, todays research is increasingly investigating advanced models that capture the flow behavior of fresh concrete as accurately as possible. These models are continuously improving but generally keep facing problems which are linked to the agglomeration of the cement particles and to the implementation of combined concrete admixtures. The objective of this work is to investigate the rheological mechanism in cement paste for the combined use of superplasticizer, retarder and accelerator. In particular, an effect on the particle agglomeration is aimed for in order to contribute to a more fundamental understanding of the concretes flow behavior. Concerning the superplasticizer impact on cement paste, thermodynamic modelling and mineralogy studies led to the conclusion that the superplasticizer can change the hydrate morphology to such an extent that the interparticle contact forces are modified. The extra addition of retarder led to a densified polymer layer at the cement grain surface which contributed to the steric stabilization of the cement paste. An additional electrostatic effect and the induced changes in hydrate morphology are also demonstrated to contribute to the low paste viscosity. With the extra addition of a calcium salt accelerator to the cement paste, an interstitial structure was assumed to diminish the rheological effect of the polymer layer.All the developed conceptual mechanisms were implemented in a coherent agglomeration model, based on measurable parameters. In this model, the internal and external hydrates in a cement agglomerate were defined and quantified. Generally, the cumulative amount of hydrates within the agglomerates influenced the agglomerate stability and the amount of external hydrates determined the reagglomeration rate. For the superplasticizer only, a proportional relation was found between the change in agglomeration rate and the external agglomerate connectivity while, for the extra addition of retarder and accelerator, a reverse relation was found. The latter was attributed to a mechanical contribution of the interstitial volume. On the one hand, the retarder creates a source of slowly hydrating nuclei and particles in that volume and, on the other hand, these particles are expected to coagulate due to the accelerator addition. In the second case, the interstitial volume also delivered a contribution to the stress resistance of the cement paste at rest.This fundamental research combines dedicated analytical methods and conceptual models to improve the understanding of particle agglomeration and contributes to a more extensive insight into the concrete rheology.

691.54 --- Academic collection --- Cements. Pozzolanic materials --- Theses --- 691.54 Cements. Pozzolanic materials

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Tiles --- Pavements, Tile --- Tile facades --- Tiles in interior decoration --- Floor coverings industry --- Carreaux --- Carrelages --- Façades en céramique --- Carreaux en décoration intérieure --- Revêtements de sol --- History --- Histoire --- Céramique architecturale --- Carreaux de ciment --- 691.4 --- 691.54 --- 693.7 --- Earth. Cob. Clayware. Stoneware. Ceramic building materials --- Cements. Pozzolanic materials --- Floor tiling. Wall tiling. Paving. Paviour's trade. Asphalt work --- 693.7 Floor tiling. Wall tiling. Paving. Paviour's trade. Asphalt work --- 691.54 Cements. Pozzolanic materials --- 691.4 Earth. Cob. Clayware. Stoneware. Ceramic building materials --- Façades en céramique --- Carreaux en décoration intérieure --- Revêtements de sol --- Belgium --- Pavements [Tile ] --- Floor coverings --- History.

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Until recently, much of the development of building materials has predominantly focused on producing cheaper, stronger and more durable construction materials. More recently attention has been given to the environmental issues in manufacturing, using, disposing and recycling of construction materials. Sustainability of construction materials brings together a wealth of recent research on the subject.The first part of the book gives a comprehensive and detailed analysis of the sustainability of the following building materials: aggregates; timber, wood and bamboo; vegetable fibres; maso

Building design --- Building materials. Building technology --- duurzame ontwikkeling --- bouwmaterialen --- Building materials. --- Sustainable construction. --- Sustainable buildings. --- Ecologically sustainable buildings --- Environmentally sustainable buildings --- Green buildings (Green technology) --- Buildings --- Sustainable development --- Green construction --- Building --- Sustainable engineering --- Architectural materials --- Architecture --- Building supplies --- Construction materials --- Structural materials --- Materials --- Building materials --- Sustainable buildings --- Sustainable construction --- 69.059.1 --- 691.175 --- 691.1 --- 691.322 --- 691.3 --- 691.504 --- 691.54 --- 691.6 --- 691.7 --- 691 --- 691 Building materials. Building components --- Building materials. Building components --- 691.7 Metallic building materials --- Metallic building materials --- 691.6 Glass. Window glass. Plate glass. Enamel etc. --- Glass. Window glass. Plate glass. Enamel etc. --- 691.54 Cements. Pozzolanic materials --- Cements. Pozzolanic materials --- 691.504 Building materials and the environment. Sustainable building materials --- Building materials and the environment. Sustainable building materials --- 691.3 Artificial stone. Concrete. Various agglomerates --- Artificial stone. Concrete. Various agglomerates --- 691.322 Aggregates (including lightweight aggregates). Breeze. Clinker. Slag. Pumice. Concrete aggregates in general --- Aggregates (including lightweight aggregates). Breeze. Clinker. Slag. Pumice. Concrete aggregates in general --- 691.1 Materials of organic origin --- Materials of organic origin --- 691.175 Plastics --- Plastics --- 69.059.1 Maintenance in general. Inspection. Cleaning --- Maintenance in general. Inspection. Cleaning --- Sustainable engineering. --- Environmental aspects.