INVESTIGATIONS INTO THE EFFECT OF ADDITION OF FLYASH AND BURNT CLAY POZZOLANA ON CERTAIN ENGINEERING PROPERTIES OF CEMENT COMPOSITES
In cementitious binders when used for masonry mortars the requirements for properties of importance during early and later ages are different. Whereas during the early periods the attributes required are water retention, workability, plasticity, adhesion, etc to allow the mortar to possess good working properties such as the ease of spreading, proper filling of joints and also to provide a water resistant crack free smooth surface, but at later ages strength becomes the main criterion to sustain the imposed load of the structure. Portland cement based mortars though harden rapidly and attain high strength but possess a relatively poor early age properties. In composite mortars there is a common practice to incorporate lime along with Portland cement, whose presence improves upon the early age rheological properties. Once the setting and hardening take place and the role of these early age properties is completed, lime has little role to play, as it hardens through the lethargic process of carbonation ie by the chemical action of lime with atmospheric carbon dioxide forming insoluble carbonate. The process of carbonation is very slow and takes place from surface inwards. Modified composite mortars have been developed by the replacement of certain part of lime with pozzolana such as burnt clay or flyash and has been found to be of advantage. Laboratory investigations on a series of such mixtures have revealed the possession of good early age properties and at the same time better strength at later ages. Some of the results are reported in this paper. (A)
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Availability:
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Corporate Authors:
The Boulevard, Langford Lane
Kidlington, Oxford United Kingdom OX5 1GB -
Authors:
- MALHOTRA, S K
- DAVE, N G
- Publication Date: 1999
Language
- English
Media Info
- Features: References;
- Pagination: p. 285-91
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Serial:
- Cement and Concrete Composites
- Volume: 21
- Issue Number: 4
- Publisher: Elsevier
- ISSN: 0958-9465
Subject/Index Terms
- TRT Terms: Cement; Clay; Composite materials; Fly ash
- ITRD Terms: 4758: Cement; 4177: Clay; 9005: Composite; 4580: Fly ash
- Subject Areas: Materials;
Filing Info
- Accession Number: 00779525
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Files: ITRD
- Created Date: Dec 7 1999 12:00AM