Influence of size and hardness of sand particles and their proportions on the friction characteristics of cement mortars: a laboratory study

Kolias, S

dc.contributor.author	Kolias, S	en
dc.date.accessioned	2014-03-01T01:10:21Z
dc.date.available	2014-03-01T01:10:21Z
dc.date.issued	1994	en
dc.identifier.issn	0149-6123	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11382
dc.subject	SKID RESISTANCE	en
dc.subject	CONCRETE PAVEMENTS	en
dc.subject	CEMENT MORTARS	en
dc.subject	CEMENT MORTAR FRICTION PROPERTIES	en
dc.subject	AGGREGATE POLISHING	en
dc.subject	SAND POLISHING	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Cements	en
dc.subject.other	Concrete pavements	en
dc.subject.other	Friction	en
dc.subject.other	Hardness	en
dc.subject.other	Limestone	en
dc.subject.other	Particles (particulate matter)	en
dc.subject.other	Polishing	en
dc.subject.other	Polishing machines	en
dc.subject.other	Sand	en
dc.subject.other	Skid resistance	en
dc.subject.other	Emery sand	en
dc.subject.other	Skid resistance value	en
dc.subject.other	Surface area	en
dc.subject.other	Mortar	en
dc.title	Influence of size and hardness of sand particles and their proportions on the friction characteristics of cement mortars: a laboratory study	en
heal.type	journalArticle	en
heal.identifier.primary	10.1520/CCA10292J	en
heal.identifier.secondary	http://dx.doi.org/10.1520/CCA10292J	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	Laboratory friction tests on cement mortar specimens, prepared with various fractions of limestone and emery sand, were carried out using the accelerated polishing machine and the British pendulum tester. Two types of investigations were performed. The first consisted of mixes with constant grading of sand, either limestone or emery, in which one fraction was replaced by the same fraction of the other type of sand. The second consisted of mixes of limestone sand in which a certain amount of emery sand, each one of four different fractions, was added each time. The exact amount of emery sand added was calculated for each fraction so that in each series of tests the total surface area of emery sand was constant, regardless of the fraction used. It was found that the finer fractions are more effective in influencing the skid resistance value (SRV) of mortars. The max increase in SRV (29.7%) is achieved when the 0.297/0.149 fraction of limestone sand is replaced by the same fraction of emery sand; therefore, an SRV value of approximately 90% of the SRV of mortar, containing entirely emery sand, is obtained. The second investigation confirmed that the total surface area of hard particles determines the friction characteristics of the mortars. It seems, however, that an optimum total surface of hard particles exists, and further increase of which does not cause additional increase of the SRV.	en
heal.publisher	ASTM, Philadelphia, PA, United States	en
heal.journalName	Cement, Concrete and Aggregates	en
dc.identifier.doi	10.1520/CCA10292J	en
dc.identifier.isi	ISI:A1994QF71200009	en
dc.identifier.volume	16	en
dc.identifier.issue	2	en
dc.identifier.spage	140	en
dc.identifier.epage	149	en