Although the rate of chemical reaction is significantly greater than with neat cement paste, the alteration of physical properties is not sufficient to compromise sealing integrity under the conditions of the experiments.doi:10.1016/j.egypro.2009.02.155Brian Strazisar a...
An effective way to reduce concrete waste is to reuse it as recycled aggregate (RA) for the production of recycled aggregate concrete (RAC). This paper studies the physio-chemical reactions of cement paste around aggregate for normal aggregate concrete (NAC) and RAC mixed with normal mixing ...
of the calcium aluminosilicate glass consists of 60-30wt.% Cab, 20-60wt.% Al2O3 and 5-25wt.% SiO2. In case of >300 pts.wt. gypsum, strength is reduced after the lapse of a long period of time because of expansion due to a reaction of unreacted gypsum. The setting regulating ...
Chemical reaction altered the mechanical properties of the core lowering the average Young鈥檚 moduli in the depleted, carbonate, and amorphous layers to approximately 75, 64, and 34% of the unaltered cement, respectively. The decreased elastic modulus of the altered cement reflects an increase in...
1) chemical reaction 化学鉴别反应 1. We can identify the false pharmaceutical products by the specialchemical reaction. 利用化学鉴别反应对药品真伪进行初步判断 ,掌握药品分子结构非常关键 ,根据药品分子结构 ,利用化学试剂 ,借鉴一些专属的和常用的鉴别方法 ,对药品真伪进行初步判断。
Potential energy characteristics and energy partitioning in chemical reactions: Ab initio MO study of fourヽentered elimination reaction CH3CH2F→CH2=CH2+HF The mechanism of energy disposal along the reaction pathway was discussed in relation to the characteristic features of potential energy surface. A...
In order to handle this new situation, the reaction rate is tuned during the simulations in such a way that the chemical equilibrium remains verified. This tuning is performed thanks to a numerical proportional integral (PI) controller technique. This extension of the Petersen matrix is applied ...
Portland cement clinker is man-made, and contains mainly four phases: Alite, belite, aluminate, and ferrite; however, we also called these phases as minerals. 1.1.2 Structure Generally, the term structure for materials refers to the arrangement of internal components of materials. The structure ...
Alkali-Silica Reaction (ASR) Control in Concrete by using different Portland Cement Alkali-silica reaction (ASR) is the chemical reaction that occurs between alkali cations and hydroxyl ions in the pore solution of hydrated cement paste an... R Agarwal,N Agnihotri,U Vidyarthi 被引量: 0发表:...
(Fig.6A). Other studies have investigated producing H2from BFG by using a CO2sorbent to effectively shift the reaction equilibrium towards H2production via the water–gas shift reaction. Although this process has been demonstrated on pilot scale [43], its product is a mixed H2/N2stream that ...