Mix Design System

The mix proportions of most latex-modified concretes cannot be easily determined in the same manner as those of latex-modified mortars because of many factors considered in the mix design. Normally, the polymer-cement ratio of the latex-modified concrete ranges from 5 to 15%, and the water-cement ratio from 30 to 50%. A rational mix design system developed for the latex-modified concrete by Ohama is described below. 

The following symbols are used in this mix design system ... 

By using the above-mentioned equations for slump and compressive strength predictions and nomographs for water-cement ratio and unit cement content estimations, an appropriate mix design system is proposed as represented in Fig. 3.4.I 1... 

Y. Ohama Mix design system for pol)mier-modified mortars, in Proceedings of the 2nd Australian Conference on Engineering Materials, The University of New South Wales, Sydney (1981), pp.163-172. 

The Superpave asphalt mix design system includes the performance grade (PG) asphalt binder specification. The Superpave asphalt binder tests try to determine physical properties that can be directly related to field performance in terms of ratting, fatigue cracking and low temperature cracking. Superpave characterizes asphalt at the actual pavement temperatures it will experience, and at the periods of time when distresses are most likely to occur. A part of the Superpave binder specification is... 

The design of a mixed refrigerant system requires the degrees of freedom to be manipulated simultaneously. These are as follows10. 

It is well known that dense ceramic membranes made of the mixture of ionic and electron conductors are permeable to oxygen at elevated temperatures. For example, perovskite-type oxides (e.g., La-Sr-Fe-Co, Sr-Fe-Co, and Ba-Sr-Co-Fe-based mixed oxide systems) are good oxygen-permeable ceramics. Figure 2.11 depicts a conceptual design of an oxygen membrane reactor equipped with an OPM. A detail of the ceramic membrane wall... 

We follow closely previous expositions of the theory (4, 5) and include only the particular features needed for our present discussion. Let us imagine a mixed-valence system composed of two subunits, A and B, which are associated with formal oxidation states M and N, respectively. We designate the corresponding electronic Hamiltonian operators H and H, and if the... 

In contrast to the use of self-assembly reactions and metal ion coordination preferences to direct the construction of mixed cofactor systems, the use of SPPS or selective chemical ligation allows for the direct covalent attachment of cofactors for the construction of mixed cofactor systems within de novo design. Figure 11 shows the flavocy-tochrome maquette constructed by Dutton and co-workers (149) using a flavin moiety covalently attached to a unique cysteine residue inside a four helix bundle with bis-histidine binding sites for heme... 

Equations (1.4), (1.5), and (1.6) can be applied only to single component gas systems. Next, we shall derive the corresponding equations for the mixed gas systems. In a phase under consideration there are many gases designated by 1, 2, 3, 4,. with n, n2, n, n, ..., rii,... moles (the mixed gas system is thermodynamically considered to be one phase except for special cases). The partial pressure of gas i , Pi, is defined as the product of the mole fraction of that species and the total pressure (P), namely... 

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