CONCRETE BATCH PLANT OPERATOR EXAM (FDOT)
(EDIT) WITH COMPLETE SOLUTIONS
1.Stockpiles gof gaggregate gshall gbe gmaintained gin ga gwell-drained
gcondition gin gorder gto:: gMinimize gFree gWater gContent
2.Coarse gaggregate gstockpiles gmust gbe gsprinkled gwith gwater gfor gat gleast
ghow gmany ghours gprior gto gbatch gfor gFDOT?: g24
3.Free gmoisture gof gthe gaggregate gmeans:: gMoisture gon gthe gsurface gof
gan gaggre- ggate gthat gis gabove gand gbeyond gthe gabsorbed gmoisture
gin gthe gaggregate.
4.If gthe gmoisture gtest gis gdone gother gthan gby gthe gcook-out gmethod, ghow
goften gshall gthe gother gmethods gbe gverified?: gEach gweek
5.For gdrill gshaft gconcrete, gthe gquantity gof gcement greplaced gwith gfly gash
gshall gbe:: g33 gto g37%
6.In gconcrete, gwhich gmaterial ghas ga gspecific ggravity gof gone?: gWater
7.What gis gthe gair gcontent grange gfor gall gclasses gof gstructural gconcrete
gexcept gClass gIV gShaft?: g1.0 gto g6.0%
1 g/
g5
, 8.When gcan gunmetered gwater gbe gadded gto gthe gconcrete?: gNot gat gall.
9.Do gnot gallow gthe gtotal gnumber gof grevolution gat gmixing gspeed gto
gexceed:: g160 gRevolutions g(?)
10.After gall gmaterials ghave gbeen gcharged ginto gthe gtransit gmixer gdrum,
gthe gconcrete gmust gbe gmixed gat ghow gmany grevolutions gat gthe gplant
gbefore gleaving gfor gthe gproject?: g70 gto g100
11.When gthe gwater gmeters g/ gscales gare gcalibrated, gprior gto gproduction, gat
gwhat gfrequency gshould gthey gbe gchecked gthere gafter?: g3 gmonths
12.To gwhat gaccuracy gshould gthe gscales gfor gweighing gcement g, gpozzolan,
gslag gand gaggregates gat gthe gplant gbe gmaintained: g0.5% gof gmaximum
gload gnormally ghandled
13.For gconcrete gcontaining ga gwater-reducing g& gretarding gadmixture, gin gan
gagi- gtator gtruck, gthe gmaximum gtime gfor gdepositing gthe gconcrete gshall gnot
gexceed:: g90 gminutes
14.If ga gload gof gconcrete ghas gbeen grejected gdue gto gexcessive gslump,
gthe gconcrete gmay gremain gin gthe gtransporting gvehicle gto greduce gthe
gslump.: gIs gnot gallowed.
15.Who gplaces gthe gorders gfor gconcrete gwith gthe gproducer?: gThe
gcontractor
16.The gminimum gnormal gsampling gfrequency gfor gthe gchloride gcontent gof
gstruc- gtural gconcrete gis:: g1 gper gdesign gmix gin guse gfrom gthe gfirst gday gof
gproduction gand gevery g30 gcalendar gdays gor gless gthereafter.
17.In gwhat gmoisture gcondition gare gthe gaggregates gon gthe gapproved
gconcrete gmix gdesigns?: gSaturated gSurface gDry g(SSD) gcondition
18.The gspecific ggravity gof gan gaggregate gis gthe gratio gof gits gunit gweight
gto gthe gweight gof gan gequal gabsolute gvolume gof:: gWater
19.What gis gthe gweight gof ga gbag gof gPortland gcement gin gthe gUSA?: g94 glbs
2 g/
g5
(EDIT) WITH COMPLETE SOLUTIONS
1.Stockpiles gof gaggregate gshall gbe gmaintained gin ga gwell-drained
gcondition gin gorder gto:: gMinimize gFree gWater gContent
2.Coarse gaggregate gstockpiles gmust gbe gsprinkled gwith gwater gfor gat gleast
ghow gmany ghours gprior gto gbatch gfor gFDOT?: g24
3.Free gmoisture gof gthe gaggregate gmeans:: gMoisture gon gthe gsurface gof
gan gaggre- ggate gthat gis gabove gand gbeyond gthe gabsorbed gmoisture
gin gthe gaggregate.
4.If gthe gmoisture gtest gis gdone gother gthan gby gthe gcook-out gmethod, ghow
goften gshall gthe gother gmethods gbe gverified?: gEach gweek
5.For gdrill gshaft gconcrete, gthe gquantity gof gcement greplaced gwith gfly gash
gshall gbe:: g33 gto g37%
6.In gconcrete, gwhich gmaterial ghas ga gspecific ggravity gof gone?: gWater
7.What gis gthe gair gcontent grange gfor gall gclasses gof gstructural gconcrete
gexcept gClass gIV gShaft?: g1.0 gto g6.0%
1 g/
g5
, 8.When gcan gunmetered gwater gbe gadded gto gthe gconcrete?: gNot gat gall.
9.Do gnot gallow gthe gtotal gnumber gof grevolution gat gmixing gspeed gto
gexceed:: g160 gRevolutions g(?)
10.After gall gmaterials ghave gbeen gcharged ginto gthe gtransit gmixer gdrum,
gthe gconcrete gmust gbe gmixed gat ghow gmany grevolutions gat gthe gplant
gbefore gleaving gfor gthe gproject?: g70 gto g100
11.When gthe gwater gmeters g/ gscales gare gcalibrated, gprior gto gproduction, gat
gwhat gfrequency gshould gthey gbe gchecked gthere gafter?: g3 gmonths
12.To gwhat gaccuracy gshould gthe gscales gfor gweighing gcement g, gpozzolan,
gslag gand gaggregates gat gthe gplant gbe gmaintained: g0.5% gof gmaximum
gload gnormally ghandled
13.For gconcrete gcontaining ga gwater-reducing g& gretarding gadmixture, gin gan
gagi- gtator gtruck, gthe gmaximum gtime gfor gdepositing gthe gconcrete gshall gnot
gexceed:: g90 gminutes
14.If ga gload gof gconcrete ghas gbeen grejected gdue gto gexcessive gslump,
gthe gconcrete gmay gremain gin gthe gtransporting gvehicle gto greduce gthe
gslump.: gIs gnot gallowed.
15.Who gplaces gthe gorders gfor gconcrete gwith gthe gproducer?: gThe
gcontractor
16.The gminimum gnormal gsampling gfrequency gfor gthe gchloride gcontent gof
gstruc- gtural gconcrete gis:: g1 gper gdesign gmix gin guse gfrom gthe gfirst gday gof
gproduction gand gevery g30 gcalendar gdays gor gless gthereafter.
17.In gwhat gmoisture gcondition gare gthe gaggregates gon gthe gapproved
gconcrete gmix gdesigns?: gSaturated gSurface gDry g(SSD) gcondition
18.The gspecific ggravity gof gan gaggregate gis gthe gratio gof gits gunit gweight
gto gthe gweight gof gan gequal gabsolute gvolume gof:: gWater
19.What gis gthe gweight gof ga gbag gof gPortland gcement gin gthe gUSA?: g94 glbs
2 g/
g5
