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Influence of cement content and environmental humidity on asphalt emulsion and cement composites performance
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Transportvetenskap, Väg- och banteknik.
2013 (engelsk)Inngår i: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 46, nr 8, s. 1275-1289Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Asphalt and cement concrete are the most popular materials used in the construction of roads, highways, bridge deck surface layers and pavements in airports and other areas with heavy wheel roads. Whereas asphalt possesses, compared to concrete, the advantages of a short curing period, high skid resistance and easy maintenance, it also shows lower fatigue durability, ravelling and rutting due to repeated concentrated loads and susceptibility to temperature changes and moisture. On the other hand, concrete pavements are initially more expensive, have lower driving comfort and are susceptible to cracking due to volume changes and to salt damage. A material with low-environmental impact and with advantages of both asphalt and concrete may be obtained by combining bitumen emulsions and a cementitious material. In this paper, cold asphalt mixtures with different amounts of cement were tested with Marshall stability tests. Selected mixtures were also cured at different environmental relative humidity (35, 70 and 90 % RH). By monitoring the mass of the specimens and estimating the water bound by the cement, the total water remaining in the mixtures was calculated. Details of the microstructure in the mixtures were examined with X-ray microtomography. According to the results of the present study, cement contributes to the hardening of cold asphalt mixtures both by creating cement paste bridges between the aggregates and by removing water from the mixtures through cement hydration. Asphalt and cement composites appear to be promising materials for implementation in real pavements, although their rate of hardening needs to be improved further.

sted, utgiver, år, opplag, sider
2013. Vol. 46, nr 8, s. 1275-1289
Emneord [en]
Bitumen emulsion, Portland cement, Environmental relative humidity, Cement asphalt composite, Hydration
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-126877DOI: 10.1617/s11527-012-9971-6ISI: 000322493800005Scopus ID: 2-s2.0-84881254279OAI: oai:DiVA.org:kth-126877DiVA, id: diva2:642808
Merknad

QC 20130823

Tilgjengelig fra: 2013-08-23 Laget: 2013-08-22 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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