New Cementitious Materials for Sustainable Construction
01 Jan 2020-pp 243-248
TL;DR: In this paper, the mechanical and physical properties of new hydraulically bound cementitious materials made from environmentally friendly waste fly ash and chemical additives were reported. But, the new products can be used for cement replacement material and need no burning process as the case with conventional cement manufacturing process.
Abstract: The paper reports the mechanical and physical properties of new hydraulically bound cementitious materials made from environmentally friendly waste fly ash and chemical additives. The new products can be used for cement replacement material and need no burning process as the case with conventional cement manufacturing process. Two fly ashes generated from incineration of domestic and industrial wastes were blended and optimized to generate a new ternary blended cementitious material. The developed blended formulation showed versatility in terms of offering different grade mortar having properties like conventional cement. The early strength was comparable to the control mortar, but after the age of 14 days and in the new products, the crushing strength rate is higher than the crushing strength rate produced using ordinary Portland cement mortar. The influence of water content, alkali activation, synthesis by water dispersing agent has also been analyzed in addition to the new material compressive strength.
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TL;DR: In this paper, the crystal stucture of crystalline solids is drastically changed by intensive mechanical forces: permanent lattice defects, polymorphic tranformations, total amorphization, possible homogeneous chemical reactions, and a definite increase of surface free energy can be observed; all these phenomena show that a high share of grinding energy can permanently stored in the ground material.
Abstract: The crystal stucture of crystalline solids is drastically changed by intensive mechanical forces: permanent lattice defects, polymorphic tranformations, total amorphisation, possible homogeneous chemical reactions, and a definite increase of surface free energy can be observed; all these phenomena show that a high share of grinding energy can be permanently stored in the ground material. Due to this mechanical activation the solid will be capable of surface and solid-state reactions, and consequently the dispersity of the system is decreased irreversibly and both the phase composition and chemical composition are changed in the direction of increased system stability, Novel type mechanochemical “capillary” reactions are also described. Reactions and surface interactions can be modified to a certain extent by vapour adsorption. Thermal and adhesion properties of solids, exposed to intensive grinding and being in an active state or having been subjected to mechanichemical transformations, are drast...
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