1887

n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Effects of PSD of GGBS on some durability properties of slag cement mortars : technical paper

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Abstract

This paper reports an investigation into the effects of particle size distribution (PSD) of ground granulated blastfurnace slag (GGBS) on some durability properties (as defined by intrinsic oxygen permeability, total porosity and pose size distribution) of slag cement mortars. The PSD of GGBS was represented by the parameters of Rosin Rammler (R-R) distribution function, namely position parameter <SPAN lang=AF style="FONT-FAMILY: Symbol; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-char-type: symbol; mso-symbol-font-family: Symbol"><SPAN style="mso-char-type: symbol; mso-symbol-font: Symbol"&gt;c&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;sub&gt;0&lt;/sub&gt; and slope <I>n</I>. The results showed that oxygen permeability and total porosity of the mortar mixes studied increased with increases in water-cement ratios whatever the age at which the specimens were tested and irrespective of percentage of slag in the mixes. An examination of the relationships between permeability and (i) total porosity and (ii) volume of pores with sizes greater than 0, 01 <SPAN lang=AF style="FONT-FAMILY: Symbol; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-char-type: symbol; mso-symbol-font-family: Symbol"><SPAN style="mso-char-type: symbol; mso-symbol-font: Symbol">m</SPAN></SPAN>m in diameter revealed that, in both cases, a good relationship exists only at the age of three days. In addition, the results showed that varying the PSD of the slag by changing either <SPAN lang=AF style="FONT-FAMILY: Symbol; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-char-type: symbol; mso-symbol-font-family: Symbol"><SPAN style="mso-char-type: symbol; mso-symbol-font: Symbol"&gt;c&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;sub&gt;0&lt;/sub&gt; at constant &lt;I&gt;n&lt;/I&gt; or vice versa affected permeability more than porosity.

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/content/civileng/41/1/EJC26862
1999-01-01
2016-12-02
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