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The effect of fly ash on the quality of mortars

Abstract

A comparative study of the commercially available blends of the fly cement was made. The focus of the research was to determine the suitability of fly ash blends in mortars. A comparative evaluation was made to establish the differences between laboratory analysis and on site practice. These comparisons were made using 4 different building sands. The laboratory evaluations were confined to specified test methods to determine the suitability of the mortar. However, the in-situ tests required an innovative approach such as: conducting tests on mortar joints to determine the in-situ compressive strengths. (A new technique was developed, which involves shooting nails into the mortar joint, determining the penetration depth and its pull out strength. This is then calibrated against cube strengths); and conducting tests using the SABS approach to determine the resistance to water penetration through a brick wall. The trends in the laboratory evaluations were as expected in terms of improved water demands, water retention and reduced compressive strengths. The in-situ mortar compressive strengths were marginally lower when using fly ash blends compared to ordinary portland cement. The use of fly ash blends improved the resistance of water penetration through a brick wall. In-situ tests are probably the only  More>>
Authors:
Hovy, M F [1] 
  1. Blue Circle Cement (Pty) Ltd., Industria West (South Africa)
Publication Date:
Dec 31, 1994
Product Type:
Conference
Report Number:
CONF-9402133-
Reference Number:
SCA: 360603; 010800; PA: CLA-95:050713; EDB-95:064612; SN: 95001379586
Resource Relation:
Conference: 2. international symposium on ash - a valuable resource, Halfway House (South Africa), 21-23 Feb 1994; Other Information: DN: IEACR LIB DA; PBD: 1994; Related Information: Is Part Of Ash - a valuable resource. Second international symposium. Volume 2; PB: 397 p.
Subject:
36 MATERIALS SCIENCE; 01 COAL, LIGNITE, AND PEAT; MORTARS; MECHANICAL PROPERTIES; FLY ASH; WASTE PRODUCT UTILIZATION; COMPARATIVE EVALUATIONS; QUALITY CONTROL; SURFACE PROPERTIES; CEMENTS; MIXTURES; BENCH-SCALE EXPERIMENTS; SPECIFICATIONS; COMPRESSION STRENGTH; PERFORMANCE TESTING; POROSITY; WATER; BUILDING MATERIALS; MATERIALS WORKING
OSTI ID:
36909
Research Organizations:
No corporate text available (Country unknown/Code not available)
Country of Origin:
South Africa
Language:
English
Other Identifying Numbers:
Other: ISBN 0-620-18353-5; TRN: 950500713
Availability:
South African Coal Ash Association (SACAA), PO Box 2665, Cresta 2118, South Africa
Submitting Site:
CLA
Size:
pp. 335-356
Announcement Date:

Citation Formats

Hovy, M F. The effect of fly ash on the quality of mortars. South Africa: N. p., 1994. Web.
Hovy, M F. The effect of fly ash on the quality of mortars. South Africa.
Hovy, M F. 1994. "The effect of fly ash on the quality of mortars." South Africa.
@misc{etde_36909,
title = {The effect of fly ash on the quality of mortars}
author = {Hovy, M F}
abstractNote = {A comparative study of the commercially available blends of the fly cement was made. The focus of the research was to determine the suitability of fly ash blends in mortars. A comparative evaluation was made to establish the differences between laboratory analysis and on site practice. These comparisons were made using 4 different building sands. The laboratory evaluations were confined to specified test methods to determine the suitability of the mortar. However, the in-situ tests required an innovative approach such as: conducting tests on mortar joints to determine the in-situ compressive strengths. (A new technique was developed, which involves shooting nails into the mortar joint, determining the penetration depth and its pull out strength. This is then calibrated against cube strengths); and conducting tests using the SABS approach to determine the resistance to water penetration through a brick wall. The trends in the laboratory evaluations were as expected in terms of improved water demands, water retention and reduced compressive strengths. The in-situ mortar compressive strengths were marginally lower when using fly ash blends compared to ordinary portland cement. The use of fly ash blends improved the resistance of water penetration through a brick wall. In-situ tests are probably the only meaningful way to determine the effectiveness of a mortar in fulfilling its functions in a wall as laid down by SABS 0164:1990. With this in mind, the same quality or an improved quality mortar will be obtained using fly ash blended cements rather than ordinary portland cement. 10 refs., 13 figs., 5 tabs.}
place = {South Africa}
year = {1994}
month = {Dec}
}