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Effects of South African Silica Sand Properties on the Strength Development and Collapsibility of Single Component Sodium Silicate Binders

Banganayi F. C., Nyembwe K., Polzin H.

Archives of Foundry Engineering

2017

Vol. 17, iss. 3

5--12

This study shows the results of the investigation of the strength performance, and residual strength of a single component inorganic binder system Cast Clean S27®. The study was conducted using three different foundry sand sources in South Africa. Sample A is an alluvial coastal sample, sample B is an alluvial riverbed sample and Sample C is a blasted sample from a consolidated quartzite rock. The binder was also cured using three different curing mechanisms. The aim of the investigation was to determine the variation of strength performance and residual strength between the different South African sand sources based upon the physical and chemical properties of the sand sources. The moulding sand was prepared using three possible curing mechanisms which are carbon dioxide curing, ester curing and heat curing. The strength measurements were determined by bending strength. Sample A and sample C sand had good strength development. Sample B sand had inferior strength development and excellent high temperature residual strength. The study showed that the single component inorganic binders have good strength development and low residual strength. The silica sand properties have major contributing factors on both strength development and residual strength. The degree of influence of silica sand properties on strength performance and residual strength is dependent on the time of curing and method of curing.

Wykorzystanie teorii gier do wyboru spoiw popiołowo-cementowych za względu na domieszki chlorków występujących w wodach kopalnianych

Kowalik S.

Zeszyty Naukowe. Górnictwo / Politechnika Śląska

2000

z. 246

335-343

W pracy wykorzystano pewne elementy teorii gier, mianowicie zasadę dominacji, do wyboru spoiw popiołowo-cementowych. W tym celu określono strategie dominujące i zdominowane. Strategie określały wielkość popiołu lotnego i cementu portlandzkiego oraz określały zawartość chlorków w wodzie kopalnianej. W pracy podano przykłady wyboru spoiwa popiołowo-cementowego ze względu na czas wiązania oraz przykłady wyboru spoiwa popiołowo-cementowego ze względu na wytrzymałość na ściskanie Rc.

In this paper certain elements of the game theory have been used, namely the principle of domination for choosing the ash-cement binders. That is why the dominating and dominated strategies have been defined. The strategies defined the size of fly-ash and Portlan cement and also defined the content of chlorides in mining water. Some examples of the choice of ash-cement binder considering the time of binding have been given and also the examples of choosing the ash-cement binder considering the endurance for compression Rc.