Concrete Structures Supplementary NCV Level 2 — Document
March 2018 — NCV Level 2 — Concrete Structures Supplementary
NCV Level 2
2018
NCV Engineering
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Q1— Section header —
1.1Discuss the important dates o f discovery and development of Portland cement
Q1— Section header —
1.1.4. Write only the answer next to the quest ion number (1.1.1
1.1.4\the ANSWER BOOK.
1.1.1Joseph Aspdin (2\
1.1.2I k. Brunel (2\
1.1.3W B Wilki nson (2\
1.1.4George Bartholomew (2\
1.210
Q2— Section header —
2.1When using timber as a construction material for formwork, the moisture content of the timber must be stabilized between a value of 15% and 20% Give TWO reasons why the moisture content of timber formwork must be
2.2Give TWO reasons why timber shutters should be coated with a good resin that will not react with the concrete. (2\
2.3Explain the term plywood. (2\
2.4Explain the term void forms. (4 [10]10
Q3— Section header —
3.1A concrete block with a base area of 3 m and a height of 1,5 m is used as a counter weight on a crane. Determine the mass of the block if the density of concrete is 2 000 kg/m
3.2Complete the followi ng sentence by using the words in the list below. Write only the missing word next to the question number (3.2.1
3.2.5\in the ANSWER BOOK. stiffening; pressure; greater; self supporting; reducing
3.2.1The greater the density of concret the form face
3.2.2A mix with a low workability (small slump\will be stiffer and
3.2.3A slow rate of pouring concrete enables the lower levels to start concrete.
3.2.4Discharging concrete from a height causes a surge, or impact formwork.
3.2.5High temperat low temperatures have the opposite effect. (5 1\ (5\
3.3xpl ain TWO different loads that formwork and false work have to resist. (4\
3.4Explain why the compacting of concrete with a poker vibrator will incre ase the pressure on formwork. (1\ [15] QUESTIO N 415
4.1Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'true' or 'false' next to the question number (4.1.1
4.1.5\ the ANSWER BOOK
4.1.1In formwork, soldiers are tall narrow pieces of timber or steel that stiffens and increase the strength of the formwork by means of extra support.
4.1.2Walling is the vertical sides of a building, constructed of concrete or bricks.
4.1.3If one do es t have steel props on building site,
4.1.4Detailed scale drawings are specific plans which will give specific instructions to the construction team on buil ding site.
4.1.5
4.2Make a neat labeled sketch to show how twisted wire is used to tie formwork together (6\
4.3Give TWO adva ntages when using adjustable props. (2\
4.4Demonstrate by means of a neat, labeled sectional drawing the support structure and decking for a concrete slab situated between two existing columns. The drawing must include the following detail: Sole
Q5— Section header —
5.1Give the appropriate procedure or method that you would use to prepare or to form a construction joint in each of the following cases
5.1.1 When t he concrete is not more than 24 hours old (2\
5.1.2When t he concrete is more than 24 hours old, but not more than three days old (3\
5.1.3When t he concrete is more than three days old (2\
5.2Complete the following sentences by using the words in the list below. Write only the words next to the question number (5.2.1
5.2.3\in the ANSWER BOOK. movement joint ; designated joint ; expansion joint
5.2.1ndependent movement between adjoining parts.
5.2.2to each other in a controlled or uncontrolled way without affecting the quality or working of the structure.
5.2.3fic joints that have been specified by the designer and planner for a particular job. (3 x 1\ (3\ [10] (12020132\10
6.1State FOUR precautions that nee d to be taken when working with or handling releasing agents. (4\
6.2Name FOUR release agents commonly used in the building industry. (4\
6.3Many people use old engine oil as a releasing agent. Explain why old engine o il is not environmenta lly friendly. (2\ [10]10
Q7— Section header —
7.1Make a neat labeled, horizontal sectional sketch through the formwork o square concrete column that will demonstrate the construction to reduce grout leakage.
7.2Choose an item from COLUMN B t hat matches a description in COLUMN A. Write only the letter (A E\next to the question number (7.2.1
7.2.5\in the ANSWER BOOK. COLUMN A COLOUMN B
7.2.5Beam and wall sides can be removed after one day with cement strength class of 42.5 R Slab forms with props left underneath can be removed after three days with a cement strength class of 42.5 R Slab props
42.5Beam props ca n be removed if the verage ambient temperature is 19 with a cement strength class of 42.5 R
9.5days 15 32 5 days cold weather hot weather (5 x 1\
7.3Describe, in your own words, what you underst an d b y the term curing of
7.4Explain the term steel reinforcing cover in concrete structures. (2\
7.5State TWO factors that can influence insufficient steel reinforcing concrete cover in concrete structures. (2\ [20] TOTAL: 10020
Mark Allocation
Total100 marks
Sections10 + 10 + 15 + 25 + 10 + 10 + 20 = 100 marks
Paper information
TitleDocument
SubjectConcrete Structures Supplementary
LevelNCV Level 2
Document typeQuestion paper
Year2018
MonthMarch
Pages7
Downloads4
Examination context
Decade2010s
Years ago8y
SeasonAutumn (SH)
Start dayThursday
Exam periodMarch 2018
Days since exam3,144
About Concrete Structures Supplementary examination preparation
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