摘要(英) |
In
recent years, the forever-lasting Taiwan and green architecture
have become a major topic in our country. In order to resolve
the runoff of rainwater resource, to prevent the spoliation of
ecology and to reduce the effect of heat island, to search for
the suitable mix design of the pervious concrete for Taiwan is
not a small issue. Pervious concrete pavement is air permeable
and water permeable, the soil underneath can be kept wet and
rainwater can quickly filter into ground, so the groundwater
resources can renew in time. It improves the environment of road
pavement and also possesses many other advantages that improve
city environment at drainage, sound absorption and skid
resistance, and is suitable for the rainy and humid environment
in Taiwan area. However, its high air voids results in low
strength, the surface layer of highway pavement was seldom used
pervious concrete due to heavy traffic loading. This study is to
search the suitable mix of pervious concrete by using cement,
silica fume, superplasticizer, steel fiber, course aggregate and
so on for highway rigid pavement. The test results including
compressive strength, flexural strength, unit weight, void
content, and permeability test were described as follows:
The compression strength of one pervious concrete core specimen
from the simulated field site can be up to 275.7kgf/cm2 and
exceeds the ordinary concrete structure specification (175 kgf/cm2).
The flexural strength of one pervious concrete core specimen
from the simulated field site can be up to 48.11kgf/cm2 and
exceeds the highway rigid pavement specification (45 kgf/cm2).
The void content can range from 18.82 to 31.87% with unit
weights of 1890 to 2034 kg/cm3 during four mix of pervious
concrete. The water penetration of the above pervious concrete
is very good and the field permeability test for the simulated
field site is about 1100ml/15sec. This study of pervious
concrete will be valuable for design and construction of
practice. |