Civil Engineering Reference
In-Depth Information
Meanwhile, concrete strength specimens were made at the same time. Relevant
supervisors preliminarily judged the concrete from appearance, dry
wet degree, and
smelly or not; temperature was also checked. Thereafter, supervisors thought that
the concrete basically met the requirements and experiments could be conducted
normally. In case the weather changed suddenly, concrete preparing speed of
backstage accelerated.
At 22:45, the
-
first car of concrete was
flatted and vibration was started; paste
generation situation was normal.
At 22:46, wooden moving rammer started working and paste generation situa-
tion was normal.
At 22:49, rotary drum started working and paste was found to be slightly thin; as
field temperature was still above 30
C and the air was dry, experimental group
°
decided not to adjust it temporarily at
field. Yet the thickness of paste was proper.
At 22:56, wooden trowel started working for the
first time and consistency of
paste was found to be proper.
At 23:17, wooden trowel started working for the second time and drying speed
on slab was found to be much faster.
At 23:41, wooden trowel started working for the third time and iron trowel was
used to start napping.
At 0:06 false setting phenomenon started emerging on slab and napping speed
accelerated; there was occasionally increasing signal of field wind force, yet it still
maintained around 3-grade.
At 0:06
0:37, napping was not stopped until napping work in this section was
-
completely
finished and then transferred to troweling machine section; covering
cloth was started at 3:21 in this section, and spray curing was experimented at the
same time.
At 0:39, concrete pouring work at Tianshan cement section
finished and concrete
pouring work started at Duolang cement section; meanwhile, yet workability is
poorer than that at Tianshan cement section under same W/C. Experimental crews
tested air content and temperature at the same time.
At 0:45, rotary drum started working and it was found more dif
cult to extract
paste compared with the last experimental section.
At 0:50, wooden trowel started working.
At 1:10,
field temperature stayed around 32
C; wind force is slightly stronger
°
than just now.
At 1:11, troweling machine started utilizing in Tianshan cement section; iron
trowel started working for the
first time in Duolang cement section.
finding setting speed is rapid in Tianshan cement section and false
setting phenomenon was serious. It was decided at
At 1:20,
field that troweling machine was
also applied in Duolang cement section.
At 2:03, wind speed at
field becomes weaker.
flatting concrete, vibrating, rubbing paste,
troweling, napping, and covering cloth were normal at
At 2:00
-
4:00, pouring concrete,
field.
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