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Recent Construction Technologies

👉Smart Roads
Although The Road has been one part of the transport infrastructure with less or no applications of modern technology, it is now being a platform for an amazing array of innovations. Smart roads (Smart Highways) use Internet of Things (IoT) devices to make driving safer, more efficient, and greener. Smart roads combine physical infrastructures such as sensors and solar panels with software infrastructure like AI and big data. Smart road technologies are embedded in roads and can improve visibility, generate energy, communicate with autonomous vehicles, give drivers real-time information regarding traffic (congestion and parking availability for example), monitor road conditions, and much more.

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FIELD TESTS FOR AGGREGATE

1. SURFACE MOISTURE CONTENT & ABSORPTION
The surface moisture in the aggregate, influences the water
cement ratio, strength and durability of the mix.
Todetermine the surface moisture of moist or wet aggregate, method is as follows-

FRYING PAN METHOD
The following apparatus are required:
A frying pan or metal tray,
Gas stove or an electric hair dryer,
A metal or glass stirring rod and
Scales to measures.
The following procedure is followed during the test
1. For coarse aggregate 2 kg sample is adequate and for
fine aggregate 0.5 kg sample is adequate.
2. The wet/moist sample is then weighed wet weight (W)
3. Heated very gently on the frying pan or metal plate and
stirred with a glass or metallic rod to maintain uniform
distribution of heat, until the sheen disappears from the
surface. The fine aggregates become surface dry when
it just starts showing free flowing characteristics.
4. The aggregates is then cooled and reweighed. The
surface dry aggregate weight (W ) is noted. The
surface moisture is then calculated as follows-
Surface moisture = [(W – W ) / W ] x 100%
5. Overheating must be avoided, as it will not give the
correct surface moisture .
6. If heating is continued either on the fry pan or in the
oven till the aggregate is bone dry aggregate weight is
then noted (Wbd) after continuous heating. The
absorption (absorbed water content) is then calculated
as follows-
Absorption = [(W – W ) / W ] x 100%
Similarly, if the dry aggregates are received on site and
absorption capacity is to be determined then the aggregates
are first soaked in water and then the above methods are
deployed to determine the absorption capacity of
aggregates.
.
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