Mortar properties

Table 6.14 Effect of polymer-cement ratio on mortar properties (Ohama et al.)...

Ohama, Y. (1995). Handbook of Polymer Modified Concrete and Mortar - Properties and Process Technology, Noyes Publications, 157-9,161-3. 

The object of this research work is the investigation of the mechanism of retardation of gypsum plaster by the addition of citric acid and its influence on the properties of the fresh and hardened mortar. The significance of this work lies in the explanation of the retardation mechanism and its close connection with the microstructure and hence with the mortar properties. 

By polymer modification of the mortar, the fresh as well as the hardened mortar properties can be positively influenced. It is important to ensure good workability, high compressive and flexural strength and low permeability. 

Due to the desired thin layer of the mortar (about 10 mm), a very fluid but still sedimentation free mortar is needed. It was planned to fill the mortar into a textile formwork which is wrapped around the steel tower. Whether a certain mortar mixture is suitable to fill such a narrow space can be tested with a specifically developed testing formwork [8]. The initial mortar composition was successfully filled into the testing formwork, confirming the fact that the fresh mortar properties should not show dramatic changes by the addition of polymers. An important factor to determine a successful filling process is the hopper flow time of the mortar, from which conclusions concerning the viscosity and the workability of the mortar can be drawn. 

In addition to the fresh mortar properties, the hardened mortar properties are also of great importance for guaranteeing proper protection against the effects of corrosion. These properties are responsible for ensuring that the mortar layer permanently remains around the steel tower in order to protect it against the impacts of the sea water. 

Uses Dispersant for calcium carbonate, pigments for paper coating and syn. pulp dispersant for paints, pigments, inks vise, reducer fluidizing agent for concrete and mortar Properties Liq. anionic 37% act. 

HANDBOOK OF POLYMER MODIFIED CONCRETE AND MORTARS Properties and... 

More precise ideas about the nature of the phenograins in Roman cements and the role they play for the mortar properties require further studies. 

Chew. Descrip. Blend of liq. hydrocarbons and polyglycols on an inorg. carrier Uses Defoamer for joint fillers, putties, leveling compds., screeds, gypsum, cement, mortars, powd. paints, adhesives plasticizing effect in some mortars Properties Wh. free-flowing powd. disp. in water apparent dens. 390 g/l 42% ash... 

Due to prehydration issues and the related changes in cement and mortar properties, the shelf lives of cementitious binders and mortars in... 

Pelletier, L., F. Winnefeld and B. Lothenbach (2010). The ternary system Portland cement-calcium sulphoaluminate clinker-anhydrite Hydration mechanism and mortar properties . Cement and Concrete Composites 32(7) 497-507. 

The industrial value of furfuryl alcohol is a consequence of its low viscosity, high reactivity, and the outstanding chemical, mechanical, and thermal properties of its polymers, corrosion resistance, nonburning, low smoke emission, and exceUent char formation. The reactivity profile of furfuryl alcohol and resins is such that final curing can take place at ambient temperature with strong acids or at elevated temperature with latent acids. Major markets for furfuryl alcohol resins include the production of cores and molds for casting metals, corrosion-resistant fiber-reinforced plastics (FRPs), binders for refractories and corrosion-resistant cements and mortars. 

Solventless Extrusion Process. The solvendess process for making double-base propellants has been used ia the United States primarily for the manufacture of rocket propellant grains having web thickness from ca 1.35 to 15 cm and for thin-sheet mortar (M8) propellant. The process offers such advantages as minimal dimensional changes after extmsion, the elimination of the drying process, and better long-term baUistic uniformity because there is no loss of volatile solvent. The composition and properties of typical double-base solvent extmded rocket and mortar propellant are Hsted ia Table... 

Although the use of simple diluents and adulterants almost certainly predates recorded history, the use of fillers to modify the properties of a composition can be traced as far back as eady Roman times, when artisans used ground marble in lime plaster, frescoes, and po22olanic mortar. The use of fillers in paper and paper coatings made its appearance in the mid-nineteenth century. Functional fillers, which introduce new properties into a composition rather than modify pre-existing properties, were commercially developed eady in the twentieth century when Goodrich added carbon black to mbber and Baekeland formulated phenol— formaldehyde plastics with wood dour. 

The resin, catalyst, and microhalloons are mixed to form a mortar which is then cast into the desirable shape and cured. Very specialized electrical and mechanical properties may be obtained by this method but at higher cost. This method of producing cellular polymers is quite appHcable to small quantity, specialized appHcations because it requires very tittle special equipment. 

Polyurethane mortar flooring systems based on somewhat similar technology to this special polyester system have also been used in chemical plants and have given excellent service. The basic urethane polymer is more elastomeric than either epoxy or polyester resins and, as such, is reported to have excellent thermal properties up... 

Abdelrazig, B. E. I., Sharp, J. H. El-Jazairi, B. (1989). Microstructure and mechanical properties of mortars made from magnesia-phosphate cement. Cement Concrete Research, 19, 247-58. 

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