Authors
Abstract
The early use of asphalt for road and street construction began in the
late 1800s, and grew rapidly with the emerging automobile industry. Since
that time, asphalt technology has made strides such that today the equipment,
techniques and materials used to build asphalt pavement structures are highly
sophisticated.
Waste glass has been used in highway construction as an aggregate
substitute in hot mix asphalt paving. Many countries have recently
incorporated glass into their roadway specifications, which had encouraged
greater use of the material. While the use of waste glass as filler in hot mix
asphalt is still not widely experimented.
In this research glass powder is proposed as an alternative to traditional lime
stone powder (Gubraa) and ordinary Portland cement fillers in hot asphalt mixtures.
Where, the effect of using waste glass powder as mineral filler on Marshall Properties
of hot asphalt concrete mixtures is investigated. Nine mixtures with three types of
fillers (lime stone powder, ordinary Portland cement and glass powder) and three filler
contents (4%, 7% and 10% by weight of total aggregate) are investigated.
The main outcome of this research is the possibility of using glass powder as
filler in hot asphalt concrete mixtures. The optimum glass powder content is 7%.
Where it is found that using of glass powder as filler with such replacement leading to
produce asphalt mixture with higher stability (% of increase up to 13%), lower flow
(% of decrease up to 39%) and lower density (% of decrease up to 10%) comparing to
corresponding ordinary Portland cement or lime stone powder mixtures.
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