Transporting Concrete

8/8/2019 Transporting Concrete

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TRAN SPO RTIN GCONCRETE

Arch. SERGE T. CHUA, Jr., fuap, Sr (M RIA)Master in Architecture, Construction Technolo!

Manae"ent


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Transporting Concrete (Truck M ixer)

Rea#! "i$e# concrete can often %e place# inits &nal location %! #irect chute #ischare

fro" a truc' "i$er.


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ersatile poer %u! can "o*e allt!pes of

concrete o*er short #istances.


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In co"parison to con*entional rear+#ischaretruc's, front+#ischare truc' "i$ers pro*i#e the #ri*er

ith

"ore "o%ilit! an# control for #irect #ischare intoplace.


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Transporting Concrete (Bucket & Crane)

Concrete is easil! lifte#to its &nal location %!%uc'et an# crane.


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Transporting Concrete (To er Crane &Bucket)

The toer crane an# %uc'et caneasil! han#le concrete for tall+

%uil#in construction.


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Transporting Concrete

The con*e!or %elt is an ecient, porta%le "etho# ofhan#lin concrete. A #rop chute pre*ents concrete

fro" sereatin as it lea*es the %elt- a scraper

pre*ents loss of "ortar. Con*e!or %elts can %eo erate# in series an# on e$ten#a%le %oo"s of


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Transporting Concrete (! ose & Pipe)

A truc'+"ounte# pu"p an# %oo" can con*enientl!"o*e concrete *erticall! or horiontall! to the #esire#

location. (/eft) ie of concrete #ischarin fro"0e$i%le hose connecte# to rii# pipeline lea#in fro"the pu"p. Rii# pipe is use# in pu"p %oo"s an# in

pipelines to "o*e concrete o*er relati*el! lon#istances. Up to 1 " (23 ft) of 0e$i%le hose "a! %e


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Transporting Concrete (Con"e#or Be$t)

A con*e!or %elt "ounte# on a truc' "i$er placesconcrete up to a%out 42 "eters (56 feet) ithout the

nee# for a##itional han#lin e7uip"ent.


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Transporting Concrete (Scre Sprea%er)

The scre sprea#er 7uic'l! sprea#s concrete o*er ai#e area to a unifor" #epth. Scre sprea#ers are

use# pri"aril! in pa*e"ent construction.


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Transporting Concrete (Air'it)

8or or' a%o*eroun#or at inaccessi%le sites,

a concrete %uc'et can %e

lifte# %! helicopter.(Source9 :aschal)


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Transporting Concrete (Boo & M ast)

A pu"p %oo" "ounte# on a "ast an# locate#near the center of a structure can fre7uentl! reachall points of place"ent. It is especiall! applica%le

to tall %uil#ins here toer cranes cannot %e tie#up ith placin concrete. Concrete is supplie# to

the %oo" throuh a pipeline fro" a roun#+le*elu" . Concrete can %e u" e# hun#re#s of


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Choosin the ;est Metho# The frst thing to look at is the type o job, its physicalsize, the total amount o concrete to be placed, andthe time schedule. Studying the job details urther willtell how much o the work is below, at, or above ground

level. This aids in choosing the concrete handlingequipment necessary or placing concrete at therequired levels.oncrete must be moved rom the mi!er to the point oplacement as rapidly as possible without segregation

or loss o ingredients. The transporting and handlingequipment must have the capacity to move su"cientconcrete so that cold joints are eliminated.


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(ossibly the concrete can be chuted directlyrom the

truck mi!er to the point needed. hutes shouldbe metal

or metal lined. They must not slope greaterthan ) vertical

to * horizontal or less than ) vertical to +horizontal. ong

chutes, over - meters */ t0, or those notmeeting slopestandards must discharge into a hopper beore

distribution

to point o need.&lternativel , a concrete um can move the


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The loss o slump caused by pressure thatorces mi! water into the aggregates as themi! travels rom pump hopper to discharge

at the end o the pipeline must be minimal$not greater than 1/ mm * in0.

The air content generally should not bereduced by more than * percentage points

during pumping. &ir loss greater than thismay be caused by a boom confguration thatallows the concrete to all e!cessively. 2nview o this, Specifcations or both slump

and air content should be met at the


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4elt conveyors are very useul or worknear ground level. Since placing concretebelow ground is requently a matter o

horizontal movement assisted by gravity,lightweight portable conveyors can be usedor high output at relatively low cost.


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Transporting Concrete