Two industrial ASTM Portland cements were carefully tested for heat of hydration (HOH) continuously up to 7 days at 23o C using isothermal conduction calorimetry in accordance to ASTM C1702. Internal and external mixing procedures were implemented. The results for HOH measurements at 7 days using isothermal calorimetry were compared to those obtained through heat of solution method (ASTM C186)....

Isothermal titration calorimetry (ITC) allows the measurement of composition-dependent mixing heats of amphiphiles. A number of experimental protocols are now established to measure molecular transfer heats between, for example, micellar and lamellar aggregates. This study deals with the principle understanding of the physical effects contributing to the ITC data. The physical state of the mixt...

Abstract Many natural and engineering flows transport more than one scalar. Moreover, to study the scalar mixing therein, knowledge of velocity field is also essential. For this reason, present work describes development a three-wire thermal-anemometry-based probe simultaneously measure velocity, helium concentration, temperature in turbulent flows. It first demonstrated, both theoretically exp...

A previous constitutive modeling for single-phase steels is extended using the mixing law to predict behavior of hot deformation in dual phase ferritic-austenitic intercritical zone Fe-C-Mn-Si alloys. Mixing considers two phases instead one, so one formula was modified. The constant’s values used represents average same conditions austenitic and ferritic model. amount each determined as functio...

Abstract The increasing concerns regarding global warming and the scarcity of raw materials in construction industry have led to a growing need for alternative low-carbon binders partially replace ordinary Portland cement. To assess suitability pozzolans as supplementary cementitious (SCMs), R 3 -test has been introduced successfully validated wide range materials. This test provides an opportu...

The hydration of tricalcium silicate powder with H2O and D2O was followed at three different temperatures using isothermal calorimetry. For both types of paste, the early kinetics could be accurately modeled, from the time of mixing to a point on the downslope of the main hydration peak, with a four-parameter nucleation and growth model. Pastes made with D2O followed the same reaction path as p...

Thorough mixing of the starting materials is the first step of a crystal growth procedure. This holds true for almost any standard technique, whereas the intentional separation of educts is considered to be restricted to a very limited number of cases. Here we show that single crystals of α-Li2IrO3 can be grown from separated educts in an open crucible in air. Elemental lithium and iridium are ...

Resin-modified glass ionomers (RMGI) set by at least 2 mechanisms dependent upon reactant diffusion prior to gelation. Each reaction's kinetics and setting mechanism may rely on and/or compete with the other. In this study, we investigated RMGI setting reaction interactions using differential scanning calorimetry (DSC) by varying light-cure initiation times. A RMGI was analyzed with isothermal ...

This paper deals with the global optimization of heat exchanger networks with fixed topology. It is shown that if linear area cost functions are assumed, as well as arithmetic mean driving force temperature differences in networks with isothermal mixing, the corresponding NLP optimization problem involves linear constraints and linear rational functions in the objective which are nonconvex. A r...