The effects of aggregate properties on lightweight concrete

This paper describes a study of the effects of several factors on the strength of lightweight aggregate concrete composites: aggregate strength, w/c ratio and the porosities of the interfacial zone and within the hardened cement paste. Concrete samples with three different water cement ratios (i.e....

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Veröffentlicht in:	Building and environment 2007-08, Vol.42 (8), p.3025-3029
Hauptverfasser:	Lo, Tommy Y., Tang, W.C., Cui, H.Z.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Buildings. Public works Cement Clay composite materials Concrete Concretes. Mortars. Grouts Exact sciences and technology Indexing in process Lightweight concrete Lightweight concretes Materials Porosity Q1 Strength w/c ratio
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Beschreibung
Zusammenfassung:	This paper describes a study of the effects of several factors on the strength of lightweight aggregate concrete composites: aggregate strength, w/c ratio and the porosities of the interfacial zone and within the hardened cement paste. Concrete samples with three different water cement ratios (i.e. 0.4, 0.44, 0.48) were compared. The crushing strengths of three grades of expanded clay lightweight aggregates (i.e. 25, 15, 5 mm) and the pore distributions of the hardened cement pastes were measured. Increasing the water/cement ratio was found to decrease the strength of lightweight aggregate concrete. The numbers of pores within the cement paste and in the aggregate/cement paste interfacial zone were found to increase.
ISSN:	0360-1323 1873-684X
DOI:	10.1016/j.buildenv.2005.06.031