Civil Technology Grade 12 NSC November 2019 Memo (English)

Downloaded from hlayiso.com GRAAD 12 NATIONAL SENIOR CERTIFICATE GRADE 12 CIVIL TECHNOLOGY: CONSTRUCTION NOVEMBER 2019 MARKING GUIDELINES MARKS: 200 These marking guidelines consist of 18 pages. Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 2 DBE/November 2019 NSC – Marking Guidelines QUESTION 1: OHSA, SAFETY, MATERIALS, TOOLS, EQUIPMENT AND JOINING (GENERIC) 1.1 1.1.1 B (1) 1.1.2 I (1) 1.1.3 A (1) 1.1.4 G/H  (1) 1.1.5 C (1) 1.1.6 F (1) 1.1.7 J (1) 1.1.8 E (1) 1.2 Electroplating: • protects metals against corrosion.  • improves the engineering- and mechanical properties of metal.  • may be used to increase the thickness of undersized parts. • is decorative. • will extend the life span. ANY TWO OF THE ABOVE (2) 1.3 Curing  (1) 1.4 The moisture: • delays/prevents the rapid drying of fresh concrete. • prevents concrete from cracking.  • ensures that fresh concrete hardens properly. • allows adhesive bonding. • increases strength of fresh concrete. ANY ONE OF THE ABOVE (1) 1.5 •When material is transported in bulk, it must be secured firmly.  •When material is transported to higher levels, make sure that workers maintain a safe distance from the material being moved overhead.  • When heavy material is transported with a lift/hoist/machine, a qualified person must take charge of operations. • Wear appropriate personal protective equipment(PPE). • Material must be transported in a safe way. • Transport should not be overloaded with material. ANY TWO OF THE ABOVE (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 3 DBE/November 2019 NSC – Marking Guidelines 1.6 Scaffold planks should: • be made of a solid wood at least 228 mm wide and 38 mm thick.  • be able to support the load. • be free from defects. • not be painted as it will hide defects/be slippery. • be supported at distances not exceeding 1,25 m. • not project less than 70 mm and not more than 230 mm beyond the ends of the last prop. • be firmly secured to prevent its displacement. • be placed in such a way to prevent materials and tools from falling through. ANY ONE OF THE ABOVE (1) 1.7 1.7.1 Dumpy level  (1) 1.7.2 If the dumpy level is not set up level: • it will give inaccurate readings.  • wrong levels will be transferred. • true levels will not be transferred. ANY ONE OF THE ABOVE (1) 1.8 1.8.1 A – Plastic plug/Plug/Rawl plug/Fisher plug/Fibre plug  (1) 1.8.2 A screw  (1) 1.8.3 Plastic plugs are used to secure: • cupboards against a wall.  • mirrors against a wall. • portraits and similar objects against a wall. • objects, limited to certain weight, against walls. ANY ONE OF THE ABOVE (1) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 4 DBE/November 2019 NSC – Marking Guidelines QUESTION 2: GRAPHICS AS MEANS OF COMMUNICATION (GENERICS) ANSWER SHEET 2 NO. QUESTIONS ANSWERS MARKS 1 Identify the elevation in FIGURE A. West Elevation  1 Identify the type of roof that is used 2 Hipped roof  1 on the building in FIGURE A. Ridge Capping/Ridge plate/Ridge 3 Identify number 1. 1 tile/Hip cap  Balcony/Floor slab of 4 Identify number 4. 1 balcony/Cantilever/Concrete slab  External door/Entrance 5 Identify number 5. 1 door/Door/Outside door  6 Identify number 7. Gutter  1 Rainwater down pipe/RWDP/Down 7 Identify number 8. 1 pipe  8 Identify number 12. Wash trough/Wash tub  1 9 Identify number 13. Built-in cupboard/BIC  1 10 Identify number 15. Landing  1 Identify the company that printed 11 Dlamini printers  1 the building plan. Name a suitable material that can Fibre cement/Galvanised sheeting/ 12 be used for the manufacturing of 1 Timber/Plastic/PVC/Polyvinylchloride number 2. Name the drawing symbol in the Electricity meter/Electrical meter/Watt 13 column for the notes in FIGURE 2 1 meter/Prepaid meter  that must be installed in the kitchen. Name the drawing symbol in the column for the notes in FIGURE 2 14 Face brick  1 that indicates the type of bricks for the building. Name a material that should NOT Steel/Mild steel/Iron/Ferrous 15 be used to manufacture the frame 1 of number 9 for coastal areas. metals  Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 5 DBE/November 2019 NSC – Marking Guidelines Name a material that can be used Stainless steel/Plastic/Ceramic/ 16 to manufacture the sanitary fitting Granite/Acrylic/Fibre 1 indicated by number 11. Glass/Concrete 17 Who checked the building plan? P Carter  1 How many types of windows are 18 2 1 used in FIGURE B? What does the abbreviation NGL at 19 Natural ground level  1 number 6 stand for? Give the reference code for this 20 QP 2-2019  1 plan. Which room will electrical symbol 21 Lounge  1 16 serve? Prevent people from falling off/through. 22 Describe the purpose of number 3. 2  Electrical wiring/Wiring/Electrical Explain what the curved lines cable/Wiring from light switch to 23 between the electrical installations 2 light/Shows which switch operates in FIGURE B indicate. which electrical fitting.  Explain why the light switch is To prevent steam/moisture entering 24 mounted on the outside of the the switch/To prevent electrical shock 1 bathroom. due to moisture/For safety purposes  Identify in FIGURE 2 which 25 North elevation  1 elevation does NOT have windows. Identify the thickness of the internal 26 110 mm  1 wall in FIGURE 2. 13 – Built-in cupboard: to store items.  Differentiate between symbols 13 27 15 – Landing: to rest/safety 2 and 15 in terms of their purpose. feature/change of direction of stairs  Ground floorplan: • does not indicate the roofline  • does not indicate the balcony • indicate an entrance door to the Justify why FIGURE B is a ground house 28 • indicate a step at the entrance 1 floor plan. door • the position of the windows and door correlate with the positions of the window and door on the west elevation Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 6 DBE/November 2019 NSC – Marking Guidelines Predict what will happen if number 10 Water/Damp will penetrate into the 29 1 is NOT installed. wall.   Redraw the staircase in FIGURE B in OR 30 the adjacent column and indicate the 2  direction of the flight with arrows. 220  + 2 600  + 110  + 3 400  + 220  = 6 550 mm or 6,55 m  IF INCORRECT METHOD IS USED TO CALCULATE THE ANSWER USE THE FOLLOWING SLIDING SCALE: Calculate the total length of the wall 31 on the eastern side of the building. • 4 MARKS WILL BE 6 Show ALL calculations. AWARDED IF ALL FIVE VALUES ARE CORRECT • 3 MARKS FOR FOUR VALUES CORRECT • 2 MARKS FOR THREE VALUES CORRECT • 1 MARK FOR 2 VALUES CORRECT TOTAL: 40 Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology (Construction) 7 DBE/ November 2019 NSC – Marking Guidelines QUESTION 3: ROOFS, STAIRCASES AND JOINING (SPECIFIC) 3.1 3.1.1 10°  (1) 3.1.2 650 mm  (1) 3.1.3 38 mm round poles  (1) 3.2 Predrilled hole filled with grout  Bolt baluster onto the tread Baluster bolted/screwed to the side of the tread/string Bolt and nut ANY ONE OF THE ABOVE (1) 3.3 Clout nails/Nails/Screws/Bolts  (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 8 DBE/November 2019 NSC – Marking Guidelines 3.4 WALL  LANDING  HANDRAIL     BALUSTER  RISE  THREAD CONCRETE CORRECTNESS  OR  HANDRAIL   HANDRAIL WALL   BALUSTER LANDING THREAD     RISE CORRECTNESS  ASSESSMENT CRITERIA MARK Wall 1 Landing 1 Baluster 1 Handrails 2 THREE treads 1 Concrete 1 Any TWO labels 2 Correctness of drawing 1 TOTAL: 10 (10) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 9 DBE/November 2019 NSC – Marking Guidelines 3.5 RIDGE BEAM     RAFTER  TIE BEAM WALL PLATE  30º     SPAN 3 m WALL   Scale    DRAWING NOT TO SCALE A MASK MUST BE USED TO MARK THIS QUESTION ASSESSMENT CRITERIA MARK Walls 2 Wall plates 2 Rafters 2 Ridge beam 1 Tie beam 1 Any THREE labels 3 Dimension of the span 1 Application of scale: ONE or TWO incorrect =3 3 THREE or FOUR incorrect = 2 More than FIVE incorrect = 1 TOTAL: 15 (15) [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 10 DBE/November 2019 NSC – Marking Guidelines QUESTION 4: EXCAVATIONS, FORMWORK, TOOLS, EQUIPMENT AND MATERIALS (SPECIFIC) 4.1 4.1.1 600 mm  (1) 4.1.2 1 meter  (1) 4.1.3 • Heavy rains  • Poor soil strata, structure or composition  • Sides not dug at correct angle • Improper use of formwork or shoring to support the walls • Vibration by machinery or heavy vehicles nearby • Water seeping into the excavated area • Contact with underground service pipes • Access to and exit from the excavation • Trucks must not go near the edge of the excavation • Soil slides due to cracks or loose soil ANY TWO OF THE ABOVE (2) 4.1.4 1,5 meter  (1) 4.1.5 Benching can be done/Formwork/Shuttering can be installed  (1) 4.2 4.2.1 A- will be used in shallow trenches/loose soil  B- will be used in firm soil  (2) 4.2.2 C- Poling boards  D- Walling boards  (2) 4.2.3 A – Has no space between the boarding  B – Has open spaces between the boards  (2) 4.3 4.3.1 Power trowel float/Power float  (1) 4.3.2 •Maintain like all machinery - lubricate and adjust according to the manufacturers, instruction.  • Clean after use.  • Store in a safe dry place. • Service the power trowel float/power float regularly. ANY TWO OF THE ABOVE (2) 4.3.3 • Check for wear and damage parts before use.  • Check controls for proper response before use.  (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 11 DBE/November 2019 NSC – Marking Guidelines 4.4 25/30 MPa  (1) 4.5 • True slump  • Shear slump  • Collapsed slump  IF THE SECOND PART OF THE ANSWER “SLUMP” IS NOT MENTIONED A MAXIMUM OF 2 MARKS WILL BE AWARDED FOR THE QUESTION. (3) 4.6 • Damp sand/Sand  • Clean sand • Soil • Sacking • Straw • Wood shavings • Canvas • Hessian ANY ONE OF THE ABOVE (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 12 DBE/November 2019 NSC – Marking Guidelines 4.7 CLEAT  SHUTTERING BOARD SIDES    WEDGE   FIXING PLATE          BRACE/STRUT PROP/STRUT  Correctness  ASSESSMENT CRITERIA MARK Shutter board sides 2 Cleats 2 Fixing plates 2 Wedges 2 Braces/Struts 4 Joining of braces to bearer 1 Any THREE labels 3 Correctness of drawing 2 TOTAL: 18 (18) [40] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 13 DBE/November 2019 NSC – Marking Guidelines QUESTION 5: PLASTER AND SCREED, BRICKWORK AND GRAPHICS AS MEANS OF COMMUNICATION (SPECIFIC) 5.1 • Smooth plaster finish  • Wavy plastered surface • Bagging plaster finish • Spatter dash finish ANY ONE OF THE ABOVE (1) 5.2 Wet the wall thoroughly  (1) 5.3 Property of good plaster: • Workable  • Cohesive • Good water retention ability ANY ONE OF THE ABOVE (1) 5.4 15 mm to 40 mm  (1) 5.5 5.5.1 A- Brick/Pavers/Cement paver  B- Bedding/Sand/Bedding sand/Screed  C- Base (mass concrete)  D- Damp proof membrane/DPM/Plastic sheeting/Damp proof course/DPC  (4) 5.5.2 •The concrete haunch is too thin to support itself.  •There is too little weight to retain the structure and to keep the paving in place. • The bond between the haunch and the edge units is weak. • The sub-base is not contained and will be washed out by ground water. • Poor ground preparation. ANY ONE OF THE ABOVE (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 14 DBE/November 2019 NSC – Marking Guidelines 5.6      Correctness  OR      Correctness  ASSESSMENT CRITERIA MARK Dead end 2 Inner skin of cavity wall 1 Outer skin of cavity wall 1 Wall tie (Any type) 1 Correctness of drawing 2 TOTAL: 7 (7) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 15 DBE/November 2019 NSC – Marking Guidelines 5.7 FRAME STILE DPC  INTERNAL SILL      GLASS 3MM THICK  PUTTY  WINDOW CASEMENT/STILE FRAME TIE/LUG EXTERNAL SILL  Application of scale 1:5  DRAWING NOT TO SCALE. USE A MASK TO MARK THIS QUESTION. ASSESSMENT CRITERIA MARK Frame stile: 105 mm x 70 mm 2 Window stile/Casement stile: 60 mm x 45 mm 2 Frame tie/lug: 25 mm wide 1 Glass: 3 mm thick 1 Putty 1 Internal window sill 1 External window sill 1 DPC 1 Any ONE label 1 Application of scale: ONE or TWO incorrect =3 3 THREE or FOUR incorrect = 2 More than FIVE incorrect = 1 TOTAL: 14 (14) [30] Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 16 DBE/November 2019 NSC – Marking Guidelines QUESTION 6: REINFORCEMENT IN CONCRETE, FOUNDATIONS, CONCRETE FLOORS AND QUANTITIES (SPECIFIC) 6.1 6.1.1 D (1) 6.1.2 A/B  (1) 6.1.3 C (1) 6.1.4 A (1) 6.1.5 D (1) 6.2 Pile foundations: • Should be used when ground conditions are not stable or solid enough to support ordinary foundations.  • Foundation piles distribute the load to more stable ground and can be used as underground or under water supports.  • Piles provide stability when a raft or floating foundation is used. • When structures are subjected to horizontal forces, pile foundations resist bending stress while still lending vertical support. • Where soils are prone to swelling and shrinking according to the moisture content. • When the superstructure is exposed to up-lifting forces. • Where soil erosion is possible, piles should be used to carry the load of the super structure. ANY TWO OF THE ABOVE (2) 6.3 • Drills  • Tampers  • Pile drop hammer/Drop hammer  • Trucks • Cranes ANY THREE OF THE ABOVE (3) 6.4 Steel tube caisson piles Pre-cast concrete piles Steel tube casing driven into the The whole pre-cast pile is driven into ground using a drop hammer and the ground using a drop hammer.  filled with concrete/cast in situ.  (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology: Construction 17 DBE/November 2019 NSC – Marking Guidelines 6.5 6.5.1 Rib-and-block floor  (1) 6.5.2 •Allow 28 days for the setting of the concrete slab.  •The concrete has to be kept moist for 7 days after casting to ensure curing.  • Temporary propping can be removed when the in-situ concrete has reached a crushing strength of 17 MPa.  • Adhere to the normal formwork striking times. • Ensure minimum movement on the rib-and- block floor after casting. • Normal construcion activities can only continue after the concrete has set properly. • Inspect for visible defects. ANY THREE OF THE ABOVE (3) 6.5.3 In-situ concrete/Mass concrete/Reinforced concrete  (1) 6.5.4 The width/length/size of the concrete hollow block.  (1) 6.5.5 •The concrete can crack.  •The structural integrity of the concrete may be compromised. • Concrete/Structure can collapse. ANY ONE OF THE ABOVE (1) 6.6 ANCHOR BAR SHEAR BAR           STIRRUP MINIMUM CONCRETE COVER MAIN BAR Correctness  ASSESSMENT CRITERIA MARK Anchor bar 2 Shear bar 2 Spacing of Stirrups/Binders 2 Main bar 2 Minimum concrete cover 1 Any ONE label 1 Correctness of drawing 1 TOTAL: 11 (11) Copyright reserved Please turn over

Downloaded from hlayiso.com Civil Technology (Construction) 18 DBE/November 2019 NSC – Marking Guidelines 6.7 A B C D 6.7.1 Total length of wall plate needed: Length of the wall = 9 000 mm – 2/220  2/  8,56  17,12 m  (5) = 8 560 mm NO UNIT IN FINAL ANSWER NO MARK 6.7.2 Number of roof trusses needed: Internal dimension + 1 roof truss Distance between centres 8 560 mm  + 1 roof truss  1 070 mm  = 8 + 1 roof truss  = 9 roof trusses needed  (5) [40] TOTAL: 200 Copyright reserved