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Assaad J.J.,Holderchem Building Chemicals S.A.L. | Asseily S.E.,Holderchem Building Chemicals S.A.L.
American Concrete Institute, ACI Special Publication | Year: 2012

With today's constraints on the necessity to reduce carbon dioxide emissions and optimize cement cost, a growing need has arised to develop new generation grinding aids (GA) that can substantially minimize the clinker factor while maintaining adequate compressive strength. A newly developed GA containing combinations of amine-based polymers and polycarboxylate acids was tested and compared to traditional glycol-based GA. Test results showed that the new generation GA leads to significant improvements in the performance of grinding mills, and decreases water demand needed to achieve given consistency. Compared to control mix, strength increase reaching 44% was measured when the new generation GA was added at 0.3% of cement weight. The corresponding clinker factor and energy consumption were found to be simultaneously reduced by 30% and 4.25%, respectively.


Assaad J.J.,Holderchem Building Chemicals S.A.L. | Asseily S.E.,Holderchem Building Chemicals S.A.L. | Harb J.,Notre Dame University - Louaize
Advances in Cement Research | Year: 2010

A comprehensive research project was undertaken to evaluate the effect of grinding aids (GAs) on the percentage of clinker decrease and reduction of energy needed during the grinding process. Three GAs, based on amines, glycols and acids, were tested at various concentrations. The tested cement properties include water demand, Blaine fineness, sieve residue, setting time and compressive strength. The results showed that the use of higher concentrations of GAs can lead to significant improvements in the performance of grinding mills characterised by higher Blaine and lower sieve residue values. Compared with the control mix, setting times were found not to be significantly affected. However, the mortar compressive strength increased by 15, 8 and 7% when using GA based on amine, glycol and acid, respectively. A decrease in both clinker factor (up to 15.8%) and grinding energy (up to 4.5%) can be simultaneously achieved through substitution of clinker with pozzolan materials with lower Mohs hardness values and the incorporation of a relatively high concentration of GA. © 2010 Thomas Telford Ltd.


Assaad J.J.,Holderchem Building Chemicals S.A.L. | Assaad J.J.,Notre Dame University - Louaize | Harb J.,Notre Dame University - Louaize
Materials and Structures/Materiaux et Constructions | Year: 2011

The oedometer test is commonly used in soil mechanics to evaluate consolidation of clays and other compressible soils. A research project was undertaken to evaluate the suitability of such test to assess surface settlement of freshly mixed cementitious-based materials. Three series of concrete-equivalent-mortar (CEM) mixtures made with different cement contents, water-to-cementitious materials ratio (w/cm), silica fume, and viscosity-modifying admixture (VMA) were tested. Validation of test results was performed by casting concrete mixtures in a PVC column having 600-mm height and 200-mm diameter. Test results have shown that CEM settlements determined using the oedometer test as well as concrete settlements determined using the 600-mm PVC column are affected quite similarly by the mixture composition. For example, for given consistency, settlement decreases with the increase in cement content, decrease in w/cm, and incorporation of increased concentrations of silica fume or VMA. Statistical analysis was then performed to propose regression models for predicting maximum settlement of concrete through the determination of CEM characteristics. © 2010 RILEM.


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Holderchem Building Chemicals Sal | Date: 2010-03-09

Chemicals used in industry, science and photography, namely, photographic processing chemicals, and waterproofing chemicals; Chemical preparations for use in agriculture, horticulture and forestry, namely, chemical preparations for the treatment of seeds; Unprocessed acrylic and epoxy resins for use in the building industry; Unprocessed plastics; Adhesives for general industrial use; Polyvinyl acetate resins; Latex glue; Acrylic Resins; Industrial adhesives for use in coating and sealing; Adhesives for applying wall coverings; Adhesives for cement manufactured goods; Adhesives for floor, ceiling and wall tiles; Adhesives for ceramic tiles; Adhesives for use in the binding of books; Adhesives for use in the manufacture of furniture; Adhesives for use in the manufacture of plywood; Unprocessed artificial resins, namely, alkyd resins for general industrial use. Asphalt, Bitumen asphalt, Bituminous coatings for roofing, bituminous products for building, namely, bituminous roof coatings, bitumen-based sealants for roofing, Non-metal ceiling tiles, Non-metal ceiling panels, Cement mixes, Floors, not of metal, Grout, Gypsum, Non-agricultural lime for use in construction, Limestone, Mortar for building, Masonry cement mixes, Plaster, Sand, except foundry sand, Tile flooring not of metal.

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