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Field Engineering Talks on FB and Others
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suraj
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PostPosted: Mon Jun 14, 2021 1:18 am    Post subject: Reply with quote

14.06.2021-Civil Field Engineering + COVID-19 Engineers Role + Designs + Construction + Methods + Contracts + Organisations + Communication + Coordination + Quality AnnexSL + Why be behind Quality of Concrete Standard Material? Talk 390
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suraj
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PostPosted: Mon Jun 14, 2021 10:02 am    Post subject: Field Engineering Building+General+Soil+Quality+Check List for RCC for DC Generator & Alternator Concrete Pour Reply with quote

Check List for RCC for DC Generator & Alternator Concrete Pour
Item # 17 previous (Preparatory Works)/# 38 this (Concrete Pour)
1     Components involved are raft, alternator foundation in thick column form, isolation between generator foundation & raft & generator foundation on isolation on raft.
2     Pouring concrete & curing activities for defined period.

Generator Alternator Raft foundation
Part of Item # 17 previous (Preparatory Works)/# 38 this (Concrete Pour)
1     This is included, as a combined foundation/raft for both Alternator & Generatorís Massive block to be founded below Generator
2     Blinding concrete course & concrete protection items must have been carried out, prior to this pour
3     Continuous supervision by quality requirement engineer & site leader must be effected throughout concrete pour
4     All reinforcing bars must have been placed, fixed & duly approved
5     All sides of raft must be formed by more required thickness or depth probably 100mm more for working purposes/for fixing level beads etc.
6     Formwork installation must also, be approved, per procedures
7     Reinforcing bars of Alternator must be within required position & be intact
8     All level marks of raft pour must be fixed by certain bead form, so that all finishing must result in same level
9     Concrete must have been ordered, depending on quantity & mixed at batching plant to maintain required slump & specified temperature not to exceed 32deg C
10     This is also, a rapid pour & for sure shall finish in one layer, if not more than 400mm, because this thickness does not come under ambit of heavy pour
11     Pour be commenced with complying with all specification & suitable application of internal vibrator
12     When pour reached its fixed bead marks, Top surface shall be leveled & wooden finished, to certain degree of smoothness, so as to receive vibration isolation system treatment layer, particularly, below Generator Massive block portion
13     Portion of Alternator element at raft finish level must be roughened to make an acceptable construction joint
14     Specified procedure of curing shall then be followed immediately, after finishing has been affected
15     Area shall be barricaded, if it is a public place & all controls affected to barricade public entry at least, on day of pouring. Cover concrete surface with polythene membrane or use curing compound for immediate prevention of shrinkage crack formations
16     Saturated hessian can be spread, covered with polythene membrane & curing continued for specified number of days. At no time, surface & sides should be allowed to be dried



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10-Method Statements Raft Concrete Sequence Sketch 59.pdf
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Raft Concrete Indicative Pour Sequence

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9-Method Statements Mass Block Concrete Sequence Sketch 58.pdf
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Massive Block Indicative Pour Sketch

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Last edited by suraj on Mon Jun 14, 2021 10:08 am; edited 1 time in total
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suraj
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PostPosted: Mon Jun 14, 2021 10:04 am    Post subject: Field Engineering Building+General+Soil+Quality+Generator foundation Concrete Pour Reply with quote

Generator foundation Concrete Pour
Part of Item # 17 previous (Preparatory Works)/# 38 this (Concrete Pour)
1     This pour is meant for construction of machine foundation massive concrete block.
2     Make sure that a coordinated instruction has been issued to RMC plant.
3     Make sure that plant operator knows about type of mix, its quantity & its grade.
4     Make sure that temperature range is known to plant operator/manager.
5     Make sure that all arrangements for workers access to pour areas are well secured.
6     Make sure that required water quantity is available on site.
7     Make sure that all concrete pouring requirements lists are available for reference & use, so as not to miss any specific item.
8     Make sure about quality engineerís availability.
9     This pour could require a concrete temperature range from 20 deg C to 24 deg C, for which ice chilled water may be required to be used for concrete mixing.
10     Make sure that all preparatory works are clean & ready to receive concrete that would be carried out in line to approved method statement, pertinent specific pouring & not general concrete pour.
11     Depth of foundation body could vary between 1.5m to 2m or more, that certainly requires stepping sequence progress arrangement for all layered pour.
12     Stepping means that pouring concrete in planned sequence only & no formwork in steps is required as such. Pouring sequence cannot be broken. Cold joints cannot be allowed to form
13     Concrete pour to start from one corner, moving to other corner of strip & then other step in sequence. For this purpose, a sequence plan is prepared & agreed. Indicative directory plan attached as a sample only
14     All sequential strips would be vibrated properly, to keep up continuity of pour.
15     Make sure that blockout pockets for grooves are not disturbed, during pouring & vibration. All such blockouts prefabricated units must remain fixed, without any dislocation during pouring
16     Between steps or layers, no cold joints would be permitted. Cold joint is very serious an issue, which cold joint state formation can be given rejection of pour
17     Top surface exposed to be finished, using wooden float or could be specified as power float. Refer to specifications or drawings for requirements
18     Generally, top surface is specified, as good finish to receive epoxy grouting layer later, blow machine support base. All vibrating equipment foundations require epoxy grouting, after bolts are installed correctly
19     Curing has to be applied with due care, since within updated specifications, advanced curing system, such as thermal, could be defined/required that may not permit any water flooding or spraying, but preserving & utilizing water cement or cementing material reaction produced heat within body of massive block. No evaporation of such heat is permitted & therefore, no water is required at once
20     Surrounding of massive block has to be maintained within specified temperature range, so that no thermal transfer can occur through formwork.
21     Thermal curing has been specified in other writings. This is too significant concept, particularly, when supplementing materials are included to produce concrete
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suraj
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PostPosted: Mon Jun 14, 2021 10:05 am    Post subject: Field Engineering Building+General+Soil+Quality+Alternator foundation Concrete Pour. Reply with quote

Alternator foundation Concrete Pour.
Part of Item # 17 previous (Preparatory Works)/# 38 this (Concrete Pour)
1     Follow all operations as are required for a Column with addition of provision of pockets for blockouts.
2     This column is monolithically, connected to combined raft for equipment.
3     Height of this column could be somewhat 4 m or more.
4     Since, size of this foundation may also, be more than 800 mm, it would be considered a thick element & worked accordingly, for concrete casting as well as, for curing.
5     Care would be exercised to make sure that construction joint with raft is properly produced, without causing any voids or honeycombing.
6     Concrete shall be poured maintaining temperature not more than 24 deg C.
7     Concrete shall be poured in layers not exceeding 400 mm deep, duly vibrated.
8     Make sure that blockout pockets for grooves are not disturbed, during pouring & vibration.
9     Between layers, no cold joints would be permitted.
10     Top surface exposed to be finished, using wooden float or could be specified as power float.
11     Generally, it is specified as good finish to receive epoxy grouting layer later.
12     Curing has to be cared with complying with updated specifications, wherein thermal curing could be specified that may not require any water flooding or spraying.
13     Surrounding of column thick block has to be maintained, within specified temperatures range, so that no thermal; transfer can occur through formwork.
14     Thermal curing has been specified in other writings. This is too significant concept, particularly, when supplementing materials are included to produce concrete
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suraj
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PostPosted: Mon Jun 14, 2021 10:18 am    Post subject: Field Engineering Building+General+Soil+Quality+Check List for RCC FairFace Concrete Pour Reply with quote

Check List for RCC FairFace Concrete Pour
Item # 18 previous (Preparatory Works)/#39 this (Concrete Pour)
1     Fairface does not require any plastering or rendering on formed surfaces.
2     Checks for all items should be made for various vertical members as described earlier, such as, alignment in lines to setting out axis & grids, dimensions of member section, vertical controls etc.
3     Ensure that plumb does not exceed out of line by 1 mm in 1000 mm.
4     No opening of form sides or bulging is allowed on fairface forms.
5     No un-required joints are allowed. Surface must follow agreed sequence
6     Make sure that all supports are well anchored/securely fixed.
7     Make adequately, proper concreting pouring arrangements, leaving no requirement missed, for concrete pour cannot be held.
8     During concreting, no voids or honeycombing are acceptable.
9     Make proper pouring plan for wall, as fairface is generally, applicable to vertical members, including elevation columns, walls & facia surfaces.
10     Texture of concrete surface, preferably should be uniform.
11     Concrete would be poured in layers of uniform thickness, allowing no visible curves on surface.
12     Concrete should be of pourable consistency, using plasticizer or up to 9% microsilica.
13     Adequate vibratorís use is too significant in such cases
14     Better, if self leveling concrete is applicable & allowed, but its use is not too common yet.
15     Over vibration has to be avoided. Only trained skilled person should operate vibrator
16     Drop height of pump boom has to be maintained, not to exceed 1.5M.
17     High level of supervision is required.
18     Pouring gang requires to be trained for such type of elevational structural works.
19     During preparatory works of forms, oil must be applied on ply to strike it easily, but that oil impact or impression should not be visible on exposed surface.
20     Curing has to follow, as specified for defined duration. Top exposed surface must be roughened & leveled & covered with polythene membrane imediately
21     During pouring, lines & plumbs have to be kept on monitoring constantly & whatever, minor bulging noticed, should be corrected immediately or else, work shall have to be redone.
22     Routine curing shall then be carried out per agreed procedures for defined suration, even if sides are not struck
23     Immediately, after a lapse of 48 hours or more say 72 hours, if sides are struck, inspect surfaces from profile & defects viewpoints & apply curing procedures, per agreed procedures
24     If minor surface undulations appear & can be rectified by grinding surfaces, have an agreement of proposal with quality engineer & engineer
25     If some minor pinholes or voids are noticed, have agreements with competent authorities for applicable remedial measures
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suraj
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PostPosted: Mon Jun 14, 2021 10:32 am    Post subject: Field Engineering Building+General+Soil+Quality+Check List for RCC Hourdy Slab Concrete Pour Reply with quote

Check List for RCC Hourdy Slab Concrete Pour
Item # 20 previous (Preparatory Works)/# 41 this (Concrete Pour)
1     Hourdy precast concrete trapezoidal blocks are used at low spacing.
2     Check all services embeds that run through beams as well as, through Hourdy block void cavities.
3     Hourdy special blocks would be required to have fixing compatibility, allowing services inserts to pass through.
4     It is to be noted that slab would be too thin topping say about 60 mm & therefore, servicesí embeds may not find any room through or within topping slab portion.
5     A bigger area of Hourdy slab should be planned to pour, since thickness is relatively lesser.
6     Make sure that all top levels are well earmarked & all concrete spacers placed in positions.
7     Make sure that reinforcing bars touch up paint is continuously, applied for epoxy coated bars, if so provided.
8     Make sure that whole portion to receive concrete is clean.
9     Make sure that no dirt is seen in beams between Hourdy.
10     Make sure that damaged blocks are replaced well.
11     Make sure again that formwork supporting system is intact.
12     Order concrete using pump & check all arrangements for pouring are available.
13     Plant operator should be instructed correctly, about delivery requirements.
14     Make ready available concrete curing arrangement.
15     Make sure for MS concrete/SCM involvement, excellent vibration shall be applied & in certain cases, setting time would start delayed by many hours, due to MS presence.
16     Receive concrete for delivery to pump, after site testing & start pouring from one corner of beams, while suggested to pour beams first & follow thin slab.
17     Use wooden/timber float to finish unformed surfaces.
18     Adopt curing procedures immediately, after finishing depending on weather conditions



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Hourdy Slab
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suraj
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PostPosted: Tue Jun 15, 2021 12:24 am    Post subject: Field Engineering Building+General+Soil+FIDICSilver-Quality+Lift Pour Reply with quote

15.06.2021-Civil Field Engineering + COVID-19 Engineers Role + Designs + Construction + Methods + Contracts + Organisations + Communication + Coordination + Quality AnnexSL + Why be behind Quality of Concrete Standard Material? Talk 391
https://www.facebook.com/100000185425294/videos/4790635974285869
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suraj
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PostPosted: Tue Jun 15, 2021 10:10 pm    Post subject: Field Engineering Building+General+Soil+Quality+Check List for RCC Sloping Portion Floor Concrete Pour Item # 21 Reply with quote

Check List for RCC Sloping Portion Floor Concrete Pour Item # 21
Item # 21 previous (Preparatory Works)/# 42 this (Concrete Pour)
1     Check that all operations have been conducted as defined, within other operations of grade slabs.
2     Ensure that cleaning has been done meeting requirement.
3     Ensure curing arrangements being intact.
4     Ensure that concrete pour to be laid from lower end to higher end.
5     Generally, slope concrete quantity is not considerable in comparison to other elements.
6     Concrete may be done slowly in comparison to unformed surfaces concrete.
7     Make sure that after concrete is poured & compacted, opening is closed as required, while hollow soundness does not occur, when tested by tamping hammer.
8     Practically, slope concrete is cast monolithic with lower & higher slab concrete that does not necessitate making of construction joints.
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PostPosted: Tue Jun 15, 2021 10:11 pm    Post subject: Field Engineering Building+General+Soil+Quality+Check List for RCC Sloping Portion Suspended Slab Concrete Pour Item # 2 Reply with quote

Check List for RCC Sloping Portion Suspended Slab Concrete Pour Item # 22
Item # 22 previous (Preparatory Works)/# 43 this (Concrete Pour)
1     Ensure that supporting system is well carried out/provided to scaffolding effective fitness in line to compliance with drawings.
2     For slope exceeding 30 to 45 degrees, special formwork requirement is made.
3     Ensure that sloping supports are well anchored & if so required, well braced.
4     Make sure that temporary platforms are available for sloping portion as well.
5     Ensure again that these forms do have square shaped openings at suitable spacing in both directions of sloping surface forms.
6     These openings should cover whole area of slope to avoid both honeycombing & voids in hardened concrete.
7     Make sure that plugs to cover these openings are available, prior to commence with pouring.
8     Make sure again that required services inserts are duly embedded within prepared sloping forms.
9     Ensure that sloping form is strong enough to be accessed & working.
10     Check these openings do allow cleaning & concreting pouring operations easily.
11     Make sure that vibrator would be applicable easily.
12     Make sure that slope would be cast monolithic with upper & lower flat concrete.
13     Make sure that curing arrangements are ready.
14     Make sure adequate number of carpenters are available below slab forms to check about yielding supporting system & to correct in case, it so happens.
15     Apply good cleaning to remove out all rubbish or dirt.
16     Plug all dust holes before watering in.
17     Water all volume of proposed concrete to maintain temperature, so that flash setting is avoided.
18     Receive concrete following all standard QR procedures & pour
19     Cure accordingly in line with approved method statements.
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PostPosted: Tue Jun 15, 2021 10:20 pm    Post subject: Field Engineering Building+General+Soil+QualityCheck List for RCC Heavy Compressor Foundation Concrete Pour Item # 23 It Reply with quote

Check List for RCC Heavy Compressor Foundation Concrete Pour Item # 23
Item # 23 previous (Preparatory Works)/# 44 this (Concrete Pour)
Procedure may apply to Cracked Gas/Propane/Ethane etc. gas compressors foundation to be installed within process areas of plants.
Dimension of foundation could be 25 m long x 8 to 10 m wide x 2 m deep or refer to sketches attached.
1     Ensure again that all precaution required for such areas for ingress/egress & other safety measures are adopted.
2     Ensure again that heavy columns or walls, if so designed, are well placed intact into foundation portion.
3     Mind that these bars are always heavy as well.
4     Sometimes bending of these reinforcing bars is not permitted.
5     It requires special positioning of these reinforcing bars.
6     Ensure that workers do work safely within space available.
7     Ensure again that forms are erected in sequence & well supported.
8     Ensure sequential panel edges are well secured.
9     Ensure corner panels are well secured.
10     Ensure access to inside of forms being safe.
11     Ensure alignment & plumb for forms in line meeting design.
12     Ensure inclined supports are fixed to necessary requirement.
13     Ensure concrete spacers are installed to meet reinforcing bars requirement.
14     Ensure certain bars on top are allowed to be fixed later, so that entry is allowed to descend to lower bars.
15     Ensure that sacrificial anodes are arranged & their interface connections to foundation reinforcing bars are tied up, using galvanized wires or cables clamped with SS C clamps,
16     Check Plan for pouring method that has been approved. Plan must be stepping concrete layers to avoid cold joints
17     Check Plan for concrete ordering sequence.
18     Check Plan for pouring working hours.
19     Check Plan for curing arrangements. Thermal curing shall be a Must for such a massive pour & all temperature controls must be complied with
20     Check Plan for workers deployment.
21     Check Plan for stepping layers management pertinent pouring.
22     Check Plan for thermal controls.
23     Check Plan for working access on to top area.
24     Check Plan for a standby construction joint formwork or stop arrangement to meet whatever damn emergency.
25     Concrete has to be poured in exact practical sequence as planned, without producing cold joints.
26     Curing is of utmost importance & therefore, requires intelligent & efficient attention.
27     Only specialized concrete pouring gang must be utilized on such significant massive concrete pour.
28     Pouring would be faster & probably, one truck load of concrete would be vacated in 5 to 10 minutes, therefore all arrangements require good management.
29     Follow temperatures as specified that should not be more than 24 degree C.
30     Ice could be used at batching plant to maintain required temperature.
31     Differential thermometers could be used within massive block concrete at defined locations for recording thermal gradient.
32     Formwork must remain intact until thermal curing continues
33     Application of curing compound is a must, once forms are struck & whatever surface repair could be required, consequent upon inspection shall be agreed & applied
34     Curing shall remain continuous for remaining duration
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