Permit for the procurement of chemicals used for various laboratory testing can be secured from, BFAD, NAPOLCOM, NBI, PDEA, The purpose of capping the concrete cylinders prior to testing for compression is to:, Protect the ends of the cylinder from premature breaking resulting from improper application of load, Provide smooth, flat ends that are perpendicular to the axis of the sample, Prevent cylinder from tilting, To maintain the verticality of the cylinder, Tensile strength, yield strength and elongation are the common required test to determine the quality of:, Aluminum guardrails, Galvanized steel sheets and coils, Reinforcing steel bars, Steel pipes, The test conducted on fully cured Carbon Fiber Sheet (CFS) application to determine the adhesion to the substrate is called:, Compressive Strength Test, Flexural Strength Test, Pull-Off test, Bonding test, A soil compacted dry will reach a certain dry density. If compacted again with same compacted effort but this time with water in the soil, the dry density will be higher because:, The water lubricates the grains and allow them to slide in a denser structure, Air is forced out of the soil, More space is left for the soil solids, All of the above, The aggregate component contributes internal friction to shear strength and stability of the bituminous mixture. The desirable shape and surface texture of aggregate particles are:, Round and smooth aggregate particles, Angular and smooth aggregate particles, Round and rough-textured particles, Angular and rough-textured particles, Consolidation test is usually performed in ______ samples?, Disturbed, Undisturbed, Consolidated, Compacted, (For shotcrete) In how many hours should concrete core samples be submerged in water before the subjecting them to compression test?, At least 30, At least 35, At least 40, At least 48, What is the weight of Class A Riprap stones?, 20 kgs to a maximum of 35 kgs with at least 50% weighing 30 kgs, 15 kgs to a maximum of 25 kgs with at least 50% weighing 20 kgs, 15 kgs to a maximum of 30 kgs with at least 50% weighing 25 kgs, 10 kgs to a maximum of 25 kgs with at least 50% weighing 20 kgs, Testing of concrete samples may be done at an earlier age for purpose of:, Payment of completed pavement, Determining the trend of its strength development, Designing the concrete mixture, Decongesting the curing tank with samples, Which of the following is not a type of volume change of concrete?, Air content, Temperature changes, Shrinkage, Creep, Slurry System for road surface treatment of Item 304A is a type of:, Cold Asphalt mixture, Hot mix Asphalt mixture, Warm mix Asphalt mixture, Porous Asphalt, This is a test criterion for reinforced concrete pipe tested in a three-edge bearing test, 0.3 mm crack, 0.4 mm crack, 0.5 mm crack, 0.6 mm crack, This is the solvent used for rapid curing cut-back asphalt:, Kerosene, Gasoline, Diesel Fuel, None of the Above, The apparent omission of a detailed description or definition concerning the quality of materials from the plans and specifications shall be regarded to mean that:, Any material can be used, Materials of first class quality are to be used, Materials that are recommended by the contractor can be used, None of the Above, What is the significance of the loss of ignition of cement?, It is a measure of the heat generated when cement is mixed in water, It signifies pre-hydration of moisture uptake of cement while it is shelved, It is a measure of the resistance of cement when exposed to fire, None of the Above, The following properties of an asphalt mix can be determined in a core sample except for:, Index of retained strength, Asphalt cement, Grading, Specific Gravity, In the construction of a 2-storey, 6-classroom school building, an estimated 18,800 units of 4” CHB will be used, how many quality tests are you going to perform?, 4 QT, 3 QT, 2 QT, None of the Above, The spot test on asphalt is used to determine:, Overheating during manufacturing, Overheating during construction, The amount of spots per unit volume, The amount of spots per unit area, Portland Cement is called because:, It mainly comes from Portland, Oregon, USA, It was originally registered as a trade name in the Island of Portland, It resembled cement obtained by grinding natural rocks found in the Isle of Portland, It was mainly the idea of Mr. Joseph Aspdin, the inventor, Unconfined compressive strength test is usually performed on:, Sandy soils, Silty soils, Organic soils, Clayey soils, What is used to measure pavement surface irregularity?, Falling weight Deflectometer equipment, Pendulum Apparatus, Dynamic Cone Penetrometer Apparatus, 3-meter straight edge, What is the function of emulsifier in Liquid asphalt?, To increase mixing ability with aggregates, To retain water in asphalts for longer periods, To prevent asphalt from hardening, To enable asphalt and water to mix, Where do we take additional cores when the measurement of any core taken from the pavement is deficient in thickness by more than 25mm?, At no less than 20 meter intervals parallel to the centerline in each direction from the affected location, At no less than 15 meter intervals parallel to the centerline in each direction from the affected location, At no less than 10 meter intervals parallel to the centerline in each direction from the affected location, At no less than 5 meter intervals parallel to the centerline in each direction from the affected location, What is the minimum test requirement for riprap boulders?, Stone size and specific gravity, Stone size and weight test and inspection report on the assessment of stone soundness, Stone size or weight test and abrasion test, Abrasion test only, The shape of compaction curve in laboratory compaction test of soil is a ______., hyperbolic, parabolic, semi-circle, straight line, The laboratory density of a bituminous mix is 97%. If the density of a newly complete asphalt pavement is as 95%, what is the degree of compaction?, 95%, 97%, 98%, 102%, In concrete pouring, large variation in the concrete cylinder results were observed. This shall be remedied by, Taking the average test result and ensure it is above the specification requirement, Checking the calibration of the compression machine, Reviewing the mix design, material quality, and aggregate condition in the batching process, All of the Above, The rate of loading of the machine will somehow affect the strength of the materials being test. The rate of loading that must be observed when testing concrete cylinder specimens is:, 20 to 50 psi/sec, 30 to 60 psi/sec, 40 to 70 psi/sec, 50 to 80 psi/sec, In concrete acceptance, core will be considered adequate if the average strength of the cores is equal to:, 80% of specified strength & if no single core is less than 75% of specified strength, 90% of specified strength & if no single core is less than 80% of specified strength, 85% of specified strength & if no single core is less than 75% of specified strength, 95% of specified strength & if no single core is less than 75% of specified strength, The improper compaction of an embankment material will ____, except:, Minimize compressibility, Decrease soil permeability, Increase shear strength soil stability, All of the Above, What is the minimum compaction requirement for an embankment?, 80%, 90%, 95%, 100%, The most widely used concrete chemical admixture for Ready-Mixed Concrete Application which has water-reducing, high range, and retarding properties is classified by ASTM C 494 as:, Type A, Type B, Type F, Type G, Accreditation of Contractor’s/Consultant’s Materials Engineer is provided under Department Order No:, D.O. No. 26 Series of 1990, D.O. No. 38 Series of 1996, D.O. No. 141 Series of 1999, D.O. No. 253 Series of 2003, ASTM C-150 requires that the 28-day strength of mortar made from Type I Portland Cement be at least 27.6 MPa. Three specimens were tested: Two passed but one failed by more than 20%. As a materials engineer, what will be your conclusion?, Discard the failed result and conclude that the particular cement passed the specification, Perform a re-test since the data is inconclusive, Get the average of the three and if the average is more than 27.6 MPa, conclude that the particular cement passed the specification, Conclude that the cement does not pass the specifications since it failed to give consistent result., The amounts of materials passing No. 50 and No. 100 sieves are important to concrete aggregates because:, The minimum amounts of these fine-sand sizes are required to ensure that the surface can be finished easily to an acceptable degree of smoothness, The maximum amounts of these fine-sand sizes are required to ensure that the cement paste is sufficient to cover each particle, An excessive quantity of fine-sand sizes would result in an uneconomical mix, All of the Above, The following test can be performed on disturbed samples taken from soil exploration except:, Grading test, Unit weight and quality of organic matter, Consolidation test, Liquid and Plastic Limit test, Which of the following is not authorized to test materials for use in DPWH projects?, Any DPWH accredited private testing laboratory, Any testing laboratory of a local government unit, Any DPWH Implementing Office Laboratory, DOST Testing Laboratory, Peat and muck are considered as, Suitable soils, Highly Organic soils, Highly Plastic soils, Colloids, In Item 514 Shotcrete, the sample frequency of the mix for compressive strength is:, 1 set per 75 m3 but not less than 1 per day of operation, 1 set per 25 m3 but not less than 1 per day of operation, 1 set per 45 m3 but not less than 1 per day of operation, 1 set per 35 m3 but not less than 1 per day of operation, What test determines the resistance of deformation of a compacted asphalt concrete mix?, Hardness test, Marshall Stability test, Ductility test, Durability test, Concrete curing refers to:, Procedures done to repair damages in concrete surfaces, Procedures done to promote cement hydration, Procedure done to maximize concrete strength, Procedures done to minimize concrete cracking, The measurement of the thickness of an asphalt core using a caliper is based on:, 4 sides, 5 sides, 6 sides, 9 sides, It is the class of concrete used for bedding and after each layer of stone in rubble concrete?, Class A, Class B, Class C, Class D, The temperature of a 7 cu. m Bituminous mix delivered at the project site is 20 degrees centigrade lower than the required compaction temperature required by the Job-Mix formula. As materials Engineer of the Project, what should you recommend?, Allow the use of the delivered materials, Advice the contractor to spread the mixture in one layer only, Reject the delivered material, Adjust the Job-Mix Formula, The rate of application of emulsified asphalt used as tack coat should be within, 0.2 to 0.5 liter/ sq. m, 0.2 to 0.7 liter/ sq. m, 0.15 to 0.7 liter/ sq. m, 1.0 to 2.0 liter/ sq. m, The following factors does not affect the strength of concrete cores drilled from the structure, except, Diameter of the core, Length to diameter ratio, Manner of drilling, Thickness of the core, The minimum penetration of piles shall be ____:, 4 m, 5 m, 6 m, Embedded length ≥ exposed length, The following are generally true in the production of high strength concrete except:, Course aggregate should be obtained from crushed rock to give the best cement/particle bond, Smaller size aggregates are preferred as more area is available for cement bonding, Admixture include accelerators and retarders, Bigger size aggregates are preferred as more voids are available for cement bonding, Unconfined compressive strength test is usually performed on _____?, Sandy soils, Salty soils, Organic soils, Clayey soils, If the minimum compressive strength for concrete class A is 20.7 MPa, what is the minimum compressive strength for concrete class C?, 16.5 MPa, 20.7 MPa, 28.5 MPa, 37.7 MPa, In Item 311-PCCP, the dividing line between coarse and fine aggregates is ____ mm sieve., 2.36 mm sieve, 4.75 mm sieve, 9.50 mm sieve, 12.50 mm sieve, In the process of the compaction of Item 200 (Aggregate Subbase) which contain sandy material only 80% density was attained. What is your recommendation in order to comply with the 100% minimum degree of compaction?, Adjust the water content, Place the material in thin layer, Provide additional binder, Use the roller with greater compactive effort, If beam samples taken from a newly paved section failed to meet the strength requirement and it is not advisable to obtain cores from the structure due to structural consideration, as Materials Engineer what will you do if the deficiency in strength of the concrete specimen is 15%?, Reject the section represented by the failed specimen, Rework the section represent by the failed specimen, Accept the section at an adjusted price due to strength deficiency, Modify the concrete design mix, Expansion joint materials to be used in Structural Concrete shall be:, Preformed Sponge Rubber and Cork, Hot-Poured elastic type, Preformed Filler, All of the Above, Stability of an asphalt pavement is its ability to resist shoving and rutting under traffic loads. In general, higher stability of the mix can be attained by using:, More medium size sand, Angular and rough aggregates, More asphalt, b and c, In hot climate, under sustained loading, asphalt cement behaves like:, Viscous liquid, Viscous solid, Elastic solid, Soft solid, It is the limit were further loss of water due to evaporation will not result in further reduction of volume of a soil mass:, Plastic Limit, Liquid Limit, Shrinkage Limit, Plasticity Index, All aggregates shall be taken stockpiled or binned for draining for at least ____ hours prior to concrete batching:, 4 hours, 8 hours, 10 hours, 12 hours, What is not the most commonly accepted measure of the hardness of aggregates?, Soundness test, Los Angeles Abrasion Test, Petrographic Test, Fractured Face Test, The accuracy of the Portland Cement weight during concrete batching shall be within plus (+) or minus (–) _____ mass percent., 1, 2, 3, 4, For Item 201, Aggregate Base Course, which statement is true?, The fraction passing No. 40 sieve shall have a liquid limit not greater than 35 and plasticity index not greater than 12, The fraction passing No. 40 sieve shall have a liquid limit not greater than 35 and plasticity index not greater than 6, The fraction passing No. 40 sieve shall have a liquid limit not greater than 25 and plasticity index not greater than 6, None of the Above, An asphalt pavement was assessed to have an International Index Roughness Value of 3.51 m/km. In accordance with DPWH Department Order No. 137 Series of 2016, the Contractor:, Is entitled to receive 100% payment of the item cost, Is entitled to receive 50% payment of the item cost, Is entitled to receive 30% payment of the item cost, Will receive no payment, Stone Mastic Asphalt shall be placed at a temperature not less than, 108°C, 115°C, 125°C, 135°C, A transit mixer for road construction was found to have a 6” slump fresh concrete instead of the required 3”. What will you recommend if you are assigned Materials Engineer?, Add Portland cement to attain the required 3” slump, Add Portland cement and fine aggregate to attain the required 3” slump, Reject the concrete mixture, Let the concrete mix diverted for pouring on a prepared column for retaining wall of the same project., The sand used in the field density test in determining the volume of hole using sand cone method must be clean, dry and passing sieve number:, 30, 40, 200, 10, These are materials installed to prevent water seepage at the expansion and construction joints of concrete structures:, Expansion joint covers, Elastomeric Sealants, Backer Rods, Waterstops, What test determines the resistance to deformation of a compacted asphalt concrete mix?, Hardness test, Marshall stability test, Ductility test, Durability test, During testing of concrete cylinders in uniaxial compression, what will happen to the result of the test if the rate of loading is rapid (i.e. way above the prescribed rate of loading)?, Nothing – rate of loading has no bearing on the result of the test, The computed compressive strength will be lower, The computed compressive strength will be higher, The result will depend on the age of the specimen, In a plastic limit test, what is the diameter of thread soils samples to be rolled by hand?, 3.2 mm, 4.75 mm, 6.4 mm, 9.6 mm, Samples of aggregate base course material when tested for quality passed the requirements except grading. What will you recommend as Material Engineer?, Reject the material, Replace the material, Accept the material at an adjusted price, Reprocess the material by blending, The following can be used to help stabilize earth slope except:, Vetiver Grass Hedgerow, Legumes, Grass Cover, Coconut Tree, The maximum percentage abrasion loss allowed for paving concrete coarse aggregate is, 30 %, 40 %, 50 %, 60 %, Under what climatic condition(s) do we use the higher penetration grade or soft asphalts:, Cold climate, Hot climate, Both cold and hot climate, Rainy weather, Sampling of soil aggregates in a big stockpile shall be done by:, Taking sample from the bottom, middle and top of the stockpile, Shoveling-off the surface at the bottom of the stockpile and taking full sample thereat, Shoveling-off the surface at the middle of the stockpile and taking full sample thereat, Shoveling-off the surface at the top of the stockpile and taking full sample thereat, Before concrete paving, the base of a road way should be kept in moist condition and saturated with water for at least _____., 2 hours, 4 hours, 6 hours, 8 hours, In the thickness measurement of zinc (hot dip galvanized) coatings on Iron and Steel products using Magnetic Thickness Measurement Method, the average coating thickness of articles whose area is greater than 100,000 mm2 (160 in2) is the average of ____ specimen coating thickness., Two (2), Three (3), Four (4), Five (5, When the top surface of a concrete specimen is rough and not truly place, stress concentrations are introduced and the strength of the concrete is reduced by about?, 1/2, 1/3, 1/4, 1/5, In which DPWH items asphalt cement can be used?, Item 303 Bituminous Seal Coat, Item 304 Bituminous Surface Treatment, Item 310 Bituminous Concrete Surface, All of the Above, The following are not purpose of driving test piles except:, To determine the required pile length, To determine the cross-sectional area of the pile, To determine the actual number of piles needed, To determine the spacing of piles, How do you obtain the density of soil in the field?, By weighing the disturbed soil removed and obtaining the volume of hole with sand or with other means, By conducting in-situ CBR in the field, By weighing the remaining soil in the laboratory, By underacting triaxial test in the field, The following are NOT true regarding the rebound the (Schmidt) hammer test for concrete except:, The test is used to determine the consistency at fresh concrete, Can be used as a substitute to direct methods of compressive strength determination such as test on cored samples, It is a simple and versatile test method which can be used even on rough concrete surfaces, The test is used to determine the composition of aggregates, In bituminous plant mix surface course the temperature of the mix shall have an allowable tolerance of:, ± 5°C, ± 10°C, ± 15°C, ± 20°C, Under Item 406, Pre-stressed Concrete Structures of the DPWH Specifications, post-tensioning of the pre-stressing reinforcement shall not commence until test on concrete cylinders indicate that the concrete has attained a compressive strength of at least:, 25 MPa, 30 MPa, 20 MPa, 28 MPa, The minimum cement content per cubic meter of Class P Structural Concrete is:, 11 bags (440 kg), 9.1 bags (364 kg), 8 bags (320 kg), 9.5 bags (380 kg), The workability of a bituminous mix is dependent on the:, Gradation of Aggregates, Temperature of mix, Asphalt content, Shape and Texture of Aggregates, As construction work progresses, you noticed that the materials delivered at the project site are different from the ones tested and that passed the requirements. As a materials engineer, what would you do?, Authorized the use of the materials, Conduct immediate re-testing of the materials for verification, Reject the materials, Replace the materials, What are the different test required for soil classification?, Natural moisture content, Gradation, and Atterberg’s Limit, Gradation and Atterberg’s Limit, Gradation and Specific Gravity, Gradation, Atterberg’s Limit and Specific Gravity, In Carbon Fiber application works, the Contractor shall prepare a quality control program that includes the following except:, Inspection of all materials to ensure conformity with contract requirements, and that all materials are new and undamaged, Inspection of all surface preparation is carried out prior to CFS application, Inspection of work in progress to ensure work is being done in accordance with DPWH Standard Specification and approved manufacturer’s instruction, Procedure for the reuse of partially cured CFS, When using a nuclear density gauge, which of the following is not a requirement?, Operator must be licensed, Radiation expose limit must be specified, Operator must wear thick clothes, Unit must be transported in approved cases, What is the permitted variation from design thickness of a layer of aggregate subbase course?, ± 20 mm, ± 10 mm, ± 15 mm, ± 30 mm.

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