Building Technology 3 Division 3 Concrete

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Building Technology Quizzes & Trivia

The type of concrete you use varies with the purpose of the building and if not used correctly can lead to collapse of the building. Have you just covered division 3 on concrete under the building technology 3 class? Take up the test below and see how much of it you understand so far.


Questions and Answers
  • 1. 
    (an aggregate larger than ¼” in size”) consists of crushed stones,gravel or other inert materials of similar characteristics.
    • A. 

      Sands

    • B. 

      Fine rocks

    • C. 

      Fine agrtegates

    • D. 

      Course aggregates

  • 2. 
    A combination of geosynthetic components, usually sheet or edge drainsconsisting of a prefabricated core to which a geotextile filter is bonded. The core provides void space to which water can flow in-plane while the geotextile filter keeps soil from filling the voids created by the core.
    • A. 

      Geomembranes

    • B. 

      Geocomposites

    • C. 

      Geotextiles

  • 3. 
    A common specification for grading fine aggregate requires that ___ to____ shall pass a No. 4 wire cloth sieve and not more than 30% nor less than 10%shall pass a No. 50 sieve.
    • A. 

      10-50%

    • B. 

      80-95%

    • C. 

      30-40%

  • 4. 
    A dark brown to black cementitious material, solid or semisolid,composed of bitumens which occur in nature but are obtainedartificially in refining petroleum, and which when mixed with graded aggregates is used as paving material by placing, shaping, and compactingwhile hot over a prepared base.
    • A. 

      COLD MIX ASPHALT OR ASPHALTIC CONCRETE

    • B. 

      ASPHALTIC MACADAM

    • C. 

      HOT MIX ASPHALT or ASPHALTIC CONCRETE

  • 5. 
    A layer of sand with uniform sizeparticles, area must be large enough toprevent the termite from moving throughit or prevents its use in "tunnel" construction.
    • A. 

      Termite Resistant Sand

    • B. 

      Termite Mesh

    • C. 

      Vertical barriers

  • 6. 
    Almost always applied during construction to the soil and foundation; or the use of termiteresistant building products, from drywall to floor joists treated with borates before use inhome construction.
    • A. 

      Pre-construction chemical barriers

    • B. 

      Vertical barriers

    • C. 

      Horizontal barriers

  • 7. 
    Applied by rodding or trenching around the base of foundations,plumbing, utility entrances, expansion joints, and where twoslabs will join, applying 4 gallons of termiticide per 10 linearfeet; each foot of depth should receive 4 gallons per 10 linearfeet; for trenches no wider than 6 inches, apply termiticide tothe trench, and mix with backfill. Hollow block voids offoundations should also be treated with 4 gallons of termiticideper 10 linear feet.
    • A. 

      Pre-construction chemical barriers

    • B. 

      Vertical barriers

    • C. 

      Horizontal barriers

  • 8. 
    Are hard durable fragments of stone and a filler of sand or othrfinely divided mineral matter, free from vegetable matter and lumps of clay, complying with the following AASHTO METHODS T-11 and T-26 Grading Requirements
    • A. 

      Base Course Materials

    • B. 

      Granular Fill or Filters

    • C. 

      Borrow Fill

  • 9. 
    Are mainly used to give color to concrete floors. There are two types:  Dry-cast, broadcast or dust-on, for surface coloring. They are dusted on, usually intwo coats; after all surface water has disappeared. The surface is then finished with asteel trowel.
    • A. 

      Hydrated lime

    • B. 

      Colored pigments

    • C. 

      Waterproofing compounds

    • D. 

      Accelerators

  • 10. 
    Are manu-factured from stearic acid orts compounds, mainly calcium steareate, and include asphalt emulsions. They are introduced usually in the amounts of 0.1 to 4.0% of the weight of cement. it wills reduce the capillary attraction of the voids in the concrete ormortar and while it may decrease water absorption of the concrete or mortar, it does notrender concrete waterproof.
    • A. 

      Accelerators

    • B. 

      Waterproofing compounds

    • C. 

      Hydrated lime

    • D. 

      Colored pigments

  • 11. 
    Are manufactured from such ingredients as rosin, beef tallow,stereates, foaming agents (soap). They introduce minute air bubbles throughout theconcrete which greatly increases the resistance of concrete to freezing and thawing,increases plasticity and reduces bleeding. Addition of air-entraining admixtures is usuallyin the protection of 3 to 6% of the volume of concrete. These require careful control andmore frequent slump tests. They may also cause some loss of strength.
    • A. 

      Retarders,

    • B. 

      Colored pigments

    • C. 

      Accelerators

    • D. 

      Air-entraining agents

  • 12. 
    Are prepared mixtures of Portland cement with hydrated lime, granulated slag, silica, etc.Small additions of calcium stereate, petroleum, colloidal clays and other admixtures with theingredients and proportions varying widely and usually patented
    • A. 

      Masonry cements

    • B. 

      Alumina cement

    • C. 

      Natural cements

    • D. 

      Pozzolanic cement

  • 13. 
    Are tests performed on soils passing the No.40 sieve
    • A. 

      Plasticity Index (PI)

    • B. 

      ATTERBERG LIMITS

    • C. 

      Plastic Limit (PL)

    • D. 

      Liquid Limit (LL)

  • 14. 
    Asphaltic concrete prepared with a relatively light and slow-curing asphalt, placed over a prepared surface withoutheat; hardens to a state that is less firm and durable than hot-mix asphaltic concrete
    • A. 

      COLD MIX ASPHALT OR ASPHALTIC CONCRETE

    • B. 

      ASPHALTIC MACADAM

    • C. 

      HOT MIX ASPHALT or ASPHALTIC CONCRETE

  • 15. 
    Before placing concrete, this consideration must take placed.
    • A. 

      The forms shall be cleaned and inspected

    • B. 

      Surfaces wetted or oiled

    • C. 

      Reinforcement properly secured

    • D. 

      All of the above

  • 16. 
    Cement shall be Portland cement, conforming to the Standard Specifications forPortland Cement (ASTM Designation__________ latest revision) for type 1 Portland Cement.
    • A. 

      C-200

    • B. 

      C-150

    • C. 

      C-250

    • D. 

      C-300

  • 17. 
    Cement should be properly protected after delivery at the building site from injury through contact with __________; stored in shed with a wood floor raised about 12” from the ground
    • A. 

      Water

    • B. 

      Termites

    • C. 

      Dampness

    • D. 

      Clay

  • 18. 
    Cements made of natural raw materials found mixed in the correct proportions, needing onlygrinding and burning in a kiln to produce a cement. Their use today has largely been replacedby Portland cement. Natural cements sets more rapidly than Portland cement and are slowerin developing strength.
    • A. 

      Masonry cements

    • B. 

      Alumina cements

    • C. 

      Natural cements

    • D. 

      Pozzolanic cement

  • 19. 
    Compared with broken stone concrete, _________is usually somewhat more fluid and easier to place, though it may have a little less crushing strength.
    • A. 

      Gravel concrete

    • B. 

      Course aggregates

    • C. 

      Fine rocks

    • D. 

      Sands

  • 20. 
    Conncrete without reinforcement is called 
    • A. 

      Reinforced

    • B. 

      Light weight

    • C. 

      Mass concrete

    • D. 

      Aerated

  • 21. 
    Consist of a continuous extrusion of polymeric ribs, forming void space throughwhich provide in-plane flow capacity; available with or without bonded geotextile filters.Geonets with bonded geotextile filters are sometimes called composite drainage nets (CDNs).
    • A. 

      Geotextiles

    • B. 

      Geonets

    • C. 

      Geomembranes

  • 22. 
    Construction materials consisting of synthetic components made for use with or within earth materials generally
    • A. 

      GEOSYNTHETICS

    • B. 

      GEOPLASTICIZED

    • C. 

      GEOMORPHOLOGY

  • 23. 
    Division 3 of Materials Specification
    • A. 

      Concrete

    • B. 

      Masonry

    • C. 

      General notes

    • D. 

      Site works

  • 24. 
    EApplying one gallon of termiticide per 10 square feet, usually by coarse spray at lowpressure. All termite treatments to slab construction should include horizontal barriers,which are relatively easy to apply.
    • A. 

      Pre-construction chemical barriers

    • B. 

      Vertical barriers

    • C. 

      Horizontal barriers

  • 25. 
    Esoil materials conforming to above General Fill requirements and to ASTM C 33, size 67, with a sand equivalent of not < than 50%, used to prevent the movement of fine particles out of soils and other natural materials through seepage.
    • A. 

      Granular Fill or Filters

    • B. 

      FILL MATERIALS

    • C. 

      SMOOTH MATERIALS

    • D. 

      CLAY MATERIALS

    • E. 

      Borrow Fill

  • 26. 
    For reinforced concrete work, coarse aggregate should be well graded in size, from¼” up to a size which will readily pass between all reinforcing bars and betweenreinforcement and forms but not exceed __ in size for reinforced beams, floor slabs,thin walls, etc., and may range up to ___ for less highly reinforced parts of thestructures such as footings, thick  /1/walls, and massive work.
    • A. 

      2"/ 1"

    • B. 

      1" /2 "

    • C. 

      3" /1"

  • 27. 
    Formed by grading and compacting layers of crushedstone or gravel, then binding the top layer with asphalt to stabilize the stone, provide a smoother surface, and seal against water penetration.
    • A. 

      COLD MIX ASPHALT OR ASPHALTIC CONCRETE

    • B. 

      ASPHALTIC MACADAM

    • C. 

      HOT MIX ASPHALT or ASPHALTIC CONCRETE

  • 28. 
    Good quality concrete is obtained through:
    • A. 

      Careful selection of materials

    • B. 

      Correct proportioning

    • C. 

      Thorough mixing and careful transporting and placing

    • D. 

      Proper curing or protection of the concrete after it is placed

    • E. 

      All of the above mentioned

  • 29. 
    Gypsum plaster is rendered more plastic by the addition of _________. Fiber or hair is alsosometimes added for greater cohesiveness. The fiber may be hemp, sisal or jute; the hair is generally cleaned goat or  cattle hair.
    • A. 

      Plasticizer

    • B. 

      Hyrdated lime

    • C. 

      Retarder

    • D. 

      Lime

  • 30. 
    In arbitrary proportion, the proportion of concrete For slabs, beams, columns, arches, stairs, walls of 100mm (4”) thickness
    • A. 

      Class “AA” 1 : 1.5 : 3

    • B. 

      Class “A” 1 : 2 : 4

    • C. 

      Class “B” 1 : 2.5 : 5

    • D. 

      Class “C” 1 : 3 : 6

  • 31. 
    In arbitrary proportion, the proportion of concrete For walls thicker than 100mm (4”), footings, steps, reinforced concrete slabs on fill.
    • A. 

      Class “AA” 1 : 1.5 : 3

    • B. 

      Class “A” 1 : 2 : 4

    • C. 

      Class “B” 1 : 2.5 : 5

    • D. 

      Class “C” 1 : 3 : 6

  • 32. 
    In materials specification, what is devision 2
    • A. 

      Site works

    • B. 

      General notes

    • C. 

      Masonry

    • D. 

      Concrete

  • 33. 
    In mixing concrete Water should be free from what?
    • A. 

      Oil

    • B. 

      Acid

    • C. 

      Alkali

    • D. 

      Vegetable matter

    • E. 

      All of the above

  • 34. 
    In mixing concrete, it is a kins of water that is not prohibited in mixing concrete
    • A. 

      Sea or brackish water

    • B. 

      Effluent water

    • C. 

      Clean water

  • 35. 
    In placing concrete which is not appropriate
    • A. 

      The forms shall be cleaned and inspected, surfaces wetted or oiled, and reinforcement properly secured

    • B. 

      Concrete should be deposited in approximately horizontal layers in wall, column and footing forms

    • C. 

      They should not be piled up in the forms which may result in the separation of the cement mortar from the coarse aggregate.

    • D. 

      Concrete should drop freely over 5 ft. for unexposed work and over 3 ft. for exposed work.

  • 36. 
    In reinforced-concrete work or in structures exposed to the elements, ______ cement is invariably employed because of its uniform quality and the high strength which it rapidly acquires.
    • A. 

      Portland

    • B. 

      Slag

    • C. 

      Pozzolanic

    • D. 

      Alumina

  • 37. 
    In storing cement bags in Piles, it should be limited to how many sacks in height
    • A. 

      13

    • B. 

      12

    • C. 

      14

    • D. 

      15

  • 38. 
    Inert mineral fillers used with cement water in making concrete, should be particles that aredurable strong, clean, hard and uncoated, and which are free from injurious amount of dusts,lumps, soft and flaky particles, shale, alkali, organic matter loam or other deleterioussubstances
    • A. 

      Minerals

    • B. 

      Aggregates

    • C. 

      Clays

    • D. 

      Sands

  • 39. 
    Involves drilling through the slab floor and injecting termiticides into the soil atregular intervals.
    • A. 

      Slab treatment

    • B. 

      Basements and Crawl Spaces

    • C. 

      Vertical barriers

  • 40. 
    Is defined as the Liquid Limit minus the Plastic Limit: LL – PL = PI, that is the range of water content over which sediment behaves.
    • A. 

      Liquid Limit (LL)

    • B. 

      Plastic Limit (PL)

    • C. 

      Plasticity Index (PI)

  • 41. 
    Is the oldest, the most commonly used the most convenient and the least scientific method or proportioning the concrete mix
    • A. 

      Water-ratio and slump test.

    • B. 

      Arbitrary proportions

    • C. 

      Water-ratio, slump and fineness modulus.

  • 42. 
    Like lime, was used as a plaster by the Egyptians, Greeks and Romans
    • A. 

      Pozzolana

    • B. 

      GYPSUM

    • C. 

      Ash cement

    • D. 

      Lime

  • 43. 
    N arbitrary proportion, the proportion of concrete For slabs on fill
    • A. 

      Class “AA” 1 : 1.5 : 3

    • B. 

      Class “A” 1 : 2 : 4

    • C. 

      Class “B” 1 : 2.5 : 5

    • D. 

      Class “C” 1 : 3 : 6

  • 44. 
    Ncrthe water content at which a silt or clay material will just begin to crumble when rolled into a tread approx 3.2mm (1/8 inch) in diameter.
    • A. 

      Liquid Limit (LL)

    • B. 

      Plastic Limit (PL)

    • C. 

      Plasticity Index (PI)

  • 45. 
    Oclassifies Inorganic soils for suitability as subgrade materials in terms of good drainage and bearing capacity.
    • A. 

      ANSI SOIL CLASSIFICATION SYSTEM

    • B. 

      AASHTO SOIL CLASSIFICATION SYSTEM

    • C. 

      ASTM SOIL CLASSIFICATION SYSTEM

  • 46. 
    One of the oldest manufactured building materials used as a mortar and plaster by early civilizations.
    • A. 

      Lime

    • B. 

      Pozzolana

    • C. 

      Ash cement

  • 47. 
    Physical barrier thatprevents termites from accessing thewood in a home. There are a variety ofmethods.
    • A. 

      Chemical Barriers:

    • B. 

      Physical Barriers

    • C. 

      Bait System:

  • 48. 
    Soil materials suitable as fill or subgrade, selected laboratory-approved pit-run gravel, disintegrated granite, sand, shale, cinders or other similar materials with not more than 35% fraction passing the No. 200 sieve.
    • A. 

      Borrow Fill

    • B. 

      Granular Fill or Filters

    • C. 

      Base Course Materials

  • 49. 
    Soil, crushed stone, and sand used to raisean existing grade, or as a man-made-deposit, generallyused under spread footings, pavers, or concrete slabs ongrade.
    • A. 

      CLAY MATERIALS

    • B. 

      SOIL MATERIALS

    • C. 

      FILL MATERIALS

    • D. 

      SMOOTH MATERIALS

    • E. 

      Granular Fill or Filters

  • 50. 
    Steel mesh product that is fine enough to keep even tiny termites from passing through it.Termite Mesh is used in slab construction, also used to wrap pipes and other accessareas.
    • A. 

      Vertical barriers

    • B. 

      Termite Resistant Sand

    • C. 

      Termite Mesh

  • 51. 
    Tcontinuous polymeric sheets that are impermeable; the most frequently used for ground applications and pond lining are thermoplastic products manufactured from high-density polyethylene (HDPE) and polyvinyl chloride (PVC)
    • A. 

      Geomembranes

    • B. 

      Geotextiles

    • C. 

      Geocomposites

  • 52. 
    The delivery from the mixer to the forms should be fairly continuous and uninterrupted,not exceeding_____ minutes.
    • A. 

      15

    • B. 

      30

    • C. 

      20

    • D. 

      10

  • 53. 
    The hardening of concrete is called
    • A. 

      Setting

    • B. 

      Batching

    • C. 

      Curing

    • D. 

      Forming

  • 54. 
    The moisture content at which a soil changes from the liquid state to theplastic state, measured when soil in a shallow dish flows to close a 12.5 mm groove after25 drops from 1 cm.
    • A. 

      Liquid Limit (LL)

    • B. 

      Plastic Limit (PL)

    • C. 

      Plasticity Index (PI)

  • 55. 
    The most common geosynthetics, consist of woven or nonwoven fabric made from polymeric materials such as polyester or polypropylene
    • A. 

      Geocomposites

    • B. 

      Geomembranes

    • C. 

      Geotextiles

  • 56. 
    The objective is to continuously attract the termite workers to forage on aslow-acting insect-growth regulator (IGR) called hexaflumuron to eliminate the entireworkers population and the entire colony. The system employs baits and monitoringdevices installed where evidence of infestation is found
    • A. 

      Bait System:

    • B. 

      Vertical barriers

    • C. 

      Horizontal Barriers

  • 57. 
    The objective is to establish a continuous termiticide barrier betweensoil access routes and the structure, either killing or repeling subterranean termites thatattempt to reach the structure. A termiticide is a type of chemical used to control termites.
    • A. 

      Chemical Barriers:

    • B. 

      Physical Barriers

    • C. 

      Bait System:

  • 58. 
    The process of mixing quicklime with water during which water is absorbed and heat isenergetically evolved, driving off much of the excess water in the form of steam.
    • A. 

      Slaking

    • B. 

      Curing

    • C. 

      Cementing

    • D. 

      Liming

  • 59. 
    The proportioned mixture of cement, aggregate and water, which when properly proportioned, is at first a plastic mass which can be cast or molded into predetermined size or shape
    • A. 

      Cement

    • B. 

      Aggregates

    • C. 

      Concrete

    • D. 

      Water

  • 60. 
    The Romans were the first to develop cement made by mixing slaked lime with pozzolana (volcanic ash) which hardened under the water, but lost the art with the fall of the Roman Empire. In 1756,Smeaton, an Englishman, rediscovered hydraulic cement, but it was not until 1824 that Aspdin, an English bricklayer and mason, invented and patented Portland cement. Today, the word “cement” generally refers to Portland cement which is principal type of cement in use.
    • A. 

      Gypsum cement

    • B. 

      Hydrated LIme

    • C. 

      Cement

  • 61. 
    The use of beach sand or lahar shall be _______ in making concrete
    • A. 

      Productively used

    • B. 

      Can be used

    • C. 

      Prohibited

  • 62. 
    Three-dimensional prefabricated polymeric systems ranging from 100mm to200mm high. The geocell systems are collapsed for delivery to the site, spread open andfilled to form a three-dimensional reinforced mattress upon arrival at a site. Originallydeveloped to rapidly stabilize soft subgrades for mobilization of large equipment, they are nowfrequently used for protection and stabilization of steep slope surfaces and protective liningsfor channels.
    • A. 

      Geocells

    • B. 

      Geonets

    • C. 

      Geomembranes

  • 63. 
    Trenches are dug around the foundation, termiticide applied and the trench filled back in. Chemicals may also be injected into the soil in the crawl space/basement and around the foundation.
    • A. 

      Basements and Crawl Spaces

    • B. 

      Vertical barriers

    • C. 

      Slab treatment

  • 64. 
    Type of cement made of lime mortar and pozzolanic material. Various natural materialscontain active silica, among them pozzolan (volcanic ash), granulated slag and pumice. Slagcement is a ___________ cement.
    • A. 

      Masonry cements

    • B. 

      Alumina cements

    • C. 

      Natural cements

    • D. 

      Pozzolanic cement

  • 65. 
    Used during very hot weather to slow down the hydration of the cement.Principal ingredients of retarders include zinc oxide, calcium lignosulfonate, andderivatives of adipic acid. The use of retarders may cause some loss of early strength andwill therefore require careful control and more frequent slump tests. Retarders alsoreduce the expansion and contraction of concrete.
    • A. 

      Retarders,

    • B. 

      Colored pigments

    • C. 

      Accelerators

    • D. 

      Air-entraining agents

  • 66. 
    Used for measuring the consistency of a concrete mix, defined as the “state offluidity of the mix”, and it includes the entire range of fluidity from the wettest to the dries possible mixtures.
    • A. 

      Tension test

    • B. 

      Compression test

    • C. 

      Slump test

    • D. 

      Water cement ratio test

  • 67. 
    Used to speed up setting time and to develop earlier strength to reducelength of time for protection. Principal ingredients of accelerators are calcium chloride.Maximum amount added is 2 lbs. per bag of cement. Accelerators have disadvantages inthat they increase the expansion and contraction of concrete; reduce resistance to sulfateattack, and increases efflorescence and corrosion of high tension steels.
    • A. 

      Accelerators

    • B. 

      Retarders

    • C. 

      Air-entraining agents

    • D. 

      Colored pigments

  • 68. 
    Utilizes bauxite, the ore from which aluminum is made, as the major raw material. It is called aquick-setting cement and its advantage is that after setting for 24 hours, alumina cementattains a compressive strength equal to the strength developed in ordinary cement only at anage of 28 days. The quick hardening produces considerable heat advantageous in coldweather construction.
    • A. 

      Masonry cements

    • B. 

      Alumina cement

    • C. 

      Natural cements

    • D. 

      Pozzolanic cement

  • 69. 
    When a large aggregate of more than 6mm (¼”) in size is added to cement,water and fine aggregate, the product is 
    • A. 

      Concrete

    • B. 

      Mortar, stucco or cement plaster

    • C. 

      Clay

    • D. 

      Grouts

  • 70. 
    When cement is mixed with water and a fine aggregate or less than 6mm (¼“), it is known as
    • A. 

      Putik

    • B. 

      Mortar, stucco or cement plaster

    • C. 

      Clay

    • D. 

      Grouts

  • 71. 
    When one or more courses or layers of asphalt an asphaltleveling course made of an asphalt and aggregate mixture of variable thickness tocorrect the contour of existing surface, are placed on existing pavement.
    • A. 

      ASPHALT OVERLAY

    • B. 

      HOT MIX ASPHALT or ASPHALTIC CONCRETE

    • C. 

      COLD MIX ASPHALT OR ASPHALTIC CONCRETE

  • 72. 
    Which of the following are added to concrete to improve workability
    • A. 

      Colored pigments

    • B. 

      Hydrated lime

    • C. 

      Accelerators

    • D. 

      Waterproofing compounds

  • 73. 
    Which of the following is a addmixture that will accelerate setting or hardening
    • A. 

      KAOLINE

    • B. 

      Calcium chloride

    • C. 

      CELITE

    • D. 

      COLORCON

  • 74. 
    Which of the following is a addmixture that will impart color
    • A. 

      METALICHROME.

    • B. 

      CELITE

    • C. 

      KAOLINE

    • D. 

      Calcium chloride,

  • 75. 
    Which of the following is a addmixture that will impart water-repellant or water-proofing qualities
    • A. 

      Calcium chloride

    • B. 

      Kaoline

    • C. 

      Metali chrome

  • 76. 
    \Concrete strengthened by having steel embedded in its called _________concrete. 
    • A. 

      Reinforced

    • B. 

      Light weight

    • C. 

      Mass concrete

    • D. 

      Aerated

  • 77. 
    _______ are substances added to cements, mortars, concrete for the purpose of improving or imparting particular properties
    • A. 

      Plasticizer

    • B. 

      Addmixture

    • C. 

      Retarder

  • 78. 
    ________ cement is obtained by finely pulverizing clinker produced by calcining to incipient fusion an intimate and proportioned mixture of argillaceous (silica, alumina) and calcareous (lime) materials with iron oxide and small amounts of other ingredients. Gypsum is added in the final grinding process to regulate the setting time of the cement.
    • A. 

      Portland

    • B. 

      Pozollana

    • C. 

      Lime

    • D. 

      Gypsum

  • 79. 
    ___________ sands are the best, though sands from any durable rock are good. A good sand is well graded from fine to coarse has a minimum of voids, and has a relatively coarseappearance.
    • A. 

      Alumina quartz

    • B. 

      Siliceous quartz

    • C. 

      Alumina silicate sands

    • D. 

      Fine silver sand

  • 80. 
    ___________rock is ground fine and heated (calcined) to between 325 °F. to 340 °F. when it loses about three-fourths of its combined water. The remaining product is Plaster of Paris, if pure gypsum is used, or hard wall plaster if 39.5 % impurities are present.
    • A. 

      Gypsum rock

    • B. 

      Igneous rock

    • C. 

      Metamorphic rock

    • D. 

      Marble rock

  • 81. 
    _____________ and ________ cements are not used except in unexposed structures where mass and weight rather than strength are essential features.
    • A. 

      Alumina and Natural

    • B. 

      Natural and slag

    • C. 

      Pozzolanic and slag

    • D. 

      Alumina and Pozzolanic

  • 82. 
     (also called stainless cement because it is free of iron impurities which stain porous marbles, some granites and limestone and other light-colored stones)
    • A. 

      Brown cement

    • B. 

      White cement

    • C. 

      Grey cement

    • D. 

      Aluminum cement

  • 83. 
     (an aggregate smaller than ¼” in size) consists of sand, stonescreenings or other inert materials of similar characteristics.
    • A. 

      Fine aggregates

    • B. 

      Course Aggregates

    • C. 

      Silica made Aggregates

    • D. 

      Alumina Aggregates