Effects of Reaction Parameters on Two-Step Alkali-Alkali Transesterification

alkali-catalyzed isomerization of lactose lactulose: study of reaction parameters and purification method

Settling Behaviour of Glycerol During Oil Alkali Transesterification

The effect of the type of oil, types of alcohol and the alcohol concentration on the settling behaviour of glycerol during biodiesel production is discussed in the current paper. Biodiesel production was performed by transesterification using 0.58 % sodium hydroxide (NaOH) as a basic catalyst at 60°C and 20 min of reaction time. The yield of biodiesel produced in each experiment was separated f...

Studies on the Alkali–Silica Reaction Rim in a Simplified Calcium–Alkali–Silicate System

This work is intended to provide a better understanding about the properties and roles of the reaction rim in an alkali-silica reaction. A simplified calcium-alkali-silicate system was created to simulate the multiple interactions among reactive silica, alkaline solution and portlandite near the aggregate surface during the formation and evolution of the reaction rim in an alkali-silica reactio...

Effect of applied stresses on alkali–silica reaction-induced expansions

The mechanical effects of alkali–silica reaction (ASR) have to be modeled in order to assess the deterioration level and the stability of ASRdamaged concrete structures. Several experimental programs have shown the effects of compressive stresses on ASR-induced strains. The effect is so significant that assessment models have to take into account the modification of ASR expansions due to applie...

Polymer Action on Alkali-silica Reaction: Further Research

Polymer modification of mortar and concrete can lead to improved transport and mechanical properties and thus its potential for an inhibiting effect on ASR or on resulting damage was investigated. An accelerated mortar bar test in a NaOH solution bath at 80 oC had already been established as inadequate to assess the behaviour of polymer-cement mortars (PCMs) under ASR, but compared to that of a...