The workability of a bituminous mix is dependent on the:, Gradation of aggregates, Temperature of mix, Asphalt content, Shape and Texture of aggregates, Soil properties can be improved by:, Adequate compaction, Addition of binder, Maximizing water content, Stabilization, Why are undisturbed samples used primarily for determining the properties of foundation materials?, To retain the structure of materials, Because it is easier to obtain undisturbed sample than disturbed samples, Because it is easier to test undisturbed sample than disturbed samples, Because it represents the relative strength of the soil strata when subjected to compression test., Too wet mix, over-sanded mix and overworking of concrete during placing usually result in ____ of concrete pavement., Cracking, Ravelling, Settlement, Scaling, What penetration grade of asphaltic material is appropriate for sealing of PCCP joints?, 85 -100, 120 – 150, 150 – 200, Not exceeding 90, Under what climate condition/s do we use the lower penetration grade or hard asphalts?, Cold climate, Hot climate, Both cold and hot climate, Rainy weather, Which is NOT a type of PCCP distress:, Scaling, Crazing, Ravelling, Pockmark, Undersized reinforcing steel bars that satisfy the tensile and elongation requirements may be accepted provided that its underweight does not exceed:, 3%, 5%, 6%, 10%, In Portland cement, the amount of water in the preparation of mortar cubes can be determined using what/cement ratio?, 0.485, 0.458, 0.585, None of the Above, Embankment materials are classified as unsuitable materials if:, The natural moisture content is 50%, The liquid limit is 40%, The plasticity index is 60, The natural density is 1,200 kg/m3, The spot test on asphalt is used to determine:, Overheating during manufacture, Overheating during construction, The amount of spot per unit volume, The amount of spot per unit area, If one of the measurement of a core specimen taken from the concrete pavement is 28.7 cm, what is the corrected measurement to be used in calculating the average thickness of the pavement if the design thickness is 28 cm?, 28.7 cm, 28.0 cm, 28.5 cm, 29.0 cm, Which of the following bituminous material is best recommended for sealing weakened plane joints?, Asphalt cement, Emulsified Asphalt, Cutback Asphalt, Joint filler asphalt, What test is conducted to classify reinforcing steel bar grade?, Tensile strength, Yield strength, Elongation, All of the Above, Quality of factory-produced reinforced concrete pipes may be best established through:, Engineer’s Certificate, Inspection Report, Test of concrete cylinder samples, Test of concrete pipe samples, Specimens for compressive or flexural strengths tests shall be removed from the molds at the end of ____ hours and stored in a moist condition until the time of test., 12, 24, 36, 48, The specification calls for a 1:2:4 concrete mix. In a one-bagger mixer, which of the following amount of water is most likely required for the mix?, 20 liters, 5 liters, 10 liters, 35 liters, What is the frequency of core sampling required on a completed bituminous pavement?, Every 100 linear meters per lane, Every 200 linear meters per lane, Every 300 linear meters per lane, Every 400 linear meters per lane, The test which combines a load-deformation test performed in the laboratory with an empirical design chart to determine the thickness of pavement base and other layers is known as:, Plate bearing test, Moisture-Density Determination, California Bearing Ratio, Standard Penetration Test, As a material engineer, when is the right time to start the sampling and testing of aggregate base course material?, Once the material is delivered and stockpiled, As construction work progresses, Once the source is identified, After the material was incorporated into the work, The selection by standard method of a representative portion of a material for the purpose of ascertaining its characteristic is called:, Batching, Quarrying, Sampling, Quartering, How many samples should be taken for an asphalt mix for 1 full day operation?, One set sample consisting of 3 cores, One set sample but not exceeding 3 core samples, One set sample of three samples but not to exceed 6 cores, None of the Above, Specimens for compressive or flexural strength test shall be removed from the molds at the end of 24 hours and be stored in a moist condition at a temperature range of ____ until the time of test., 24 to 28 °C, 21 to 25 °C, 22 to 26 °C, 18 to 22 °C, In how many equal layers should a concrete beam sample be molded?, 2, 3, 4, 5, Bituminous mixture shall have a minimum dry compressive strength of, 100 psi, 200 psi, 300 psi, 400 psi, When the top surface of a concrete specimen is rough and not truly plane, stress concentrations are introduced and the strength of the concrete is reduced by, 1/2, 1/3, 1/4, 1/5, Generally, acceptance of concrete pavement is based upon:, Cores, Beam sample, Both a and b, Either a or b, A set of three (3) beam samples representing a particular section of a concrete pavement failed to meet the flexural strength requirements. As a materials engineer, what would you recommend?, Monitor the pavement section with strength deficiency, Adjust the payment corresponding to the strength deficiency of the beam samples, Conduct core test for strength determination on section represented by the failed samples to determine the actual strength of the in-placed concrete, Submit new beam samples for testing, Test pitting conducted on a prepared base showed that the thickness of Item 201 – Aggregate base course was deficient by 5 cm. As a materials engineer, what will you recommend?, Reject the prepared section, Rework the section, Accept the section at an adjusted price due to thickness deficiency, Provide sand cushion to attain the thickness requirement, This is the type of paint intended for concrete and other masonry surface., Enamel paint, Latex paint, Polyurethane paint, None of the Above, It is a single test procedure to determine the suitability of an asphaltic concrete mix., Penetration, Extraction, Marshall Stability, Immersion-Compression, The optimum moisture content of soil is determined during, Laboratory compaction, Compaction of a trial section, Field compaction test, Any of the Above, Suppose you have a sack of aggregate sample weighing 20 kg but you only need 5 kg for a certain test. In the absence of sample splitter, what will be the best way to get a 5 kg sample?, Get a 5 kg sample from the middle of the sack, Remove the aggregate from the sack and lay it a pile on a clean floor then get the 5 kg sample from the middle of the sack, Perform quartering procedure, Get a 5 kg sample direct from the sack, What is the function of emulsifiers in liquid asphalt?, To increase mixing ability with aggregates, To retain water in asphalt for longer periods, To prevent asphalt from hardening, To enable asphalt and water to mix, Asphalt increases in Marshall Stability Test, the air voids:, Increases, Decreases, Remains constant, Either b or a, An admixture that tends to reduce incidence of thermal cracking and to maintain concrete workability during large pours or long ready-mix hauls is a/an:, Water-reducing admixture, Retarding water-reducing admixture, Air-entraining admixture, Accelerating admixture, A concrete core specimen for thickness determination shall have a diameter of at least:, 75 mm, 100 mm, 125 mm, 150 mm, How many pipes should be tested for strength, absorption, and dimension in 300 pcs of reinforced culvert pipe?, 1, 2, 4, 6, Which of the following is the frequency of sampling of concrete beams required by DPWH specification?, At least one set of 3 concrete beams every 50 m^3 or fraction thereof, At least one set of 3 concrete beams every 500 m^3 or fraction thereof, At least one set of 3 concrete beams every 75 m^3 or fraction thereof, At least one set of 3 concrete beams every 750 m^3 or fraction thereof, Samples of aggregate base course material when tested for quality passed the requirements except grading. What will you recommend as a materials engineer?, Reject the material, Replace the material, at an adjusted price, Reprocess the material by blending, During asphalt compaction, the rolling speed, whether being used in the vibratory or static mode, should not exceed ____ km/hr., 4 – 7, 5 – 8, 6 – 9, 7 – 10, Two concrete cylinder A and B are tested in uniaxial compression, and if cylinder A is completely saturated while B is dry, which of the following is true?, Both cylinders will yield the same compressive strength provided that all of the factors are the same, Whether cylinder A will yield a higher compressive strength over cylinder B (or otherwise) is unpredictable, Cylinder A will yield higher compressive strength, Cylinder B will yield higher compressive strength, When the strength test results of concrete beam samples are not acceptable, how many representative core/s shall be taken from each member or area of concrete in place considered deficient in the newly completed concrete pavement?, At least 4 cores, At least 3 cores, At least 2 cores, Only 1 core, The sieving process (grain size) does NOT provide information on, Shape of soil grains, Distribution of grain sizes, Soil classification, Both b and c, DPWH D.O. No. 47, Series of 2015 requires an International Roughness Index (IRI) values of not more than ____ for both asphalt and pavement for National Primary Roads., 2.00 m/km, 2.50 m/km, 3.00 m/km, 3.50 m/km, The required strength of a concrete beam sample is at least ___ when tested by mid-point method., 550 psi, 650 psi, 3,000 psi, 3,500 psi, What is the phosphorus content requirement for rebars?, 0.06 min, 0.06 max, 0.60 max, None of the above, A mixture of asphalt cement and water with catalytic agent is called:, Joint filler, Emulsified asphalt, Cutback asphalt, Asphalt cement, Materials suitable for embankment shall have a plasticity index of not more than, 12, 10, 8, 6, What will be possibly the result of using different brands of cement in concrete paving?, Different Strength, Different Texture, Different color after it hardened, No effect, Concrete samples must be shipped to the laboratory at least ___ hours prior to testing., 12, 24, 36, 48, Which of the following is the thinnest and most fluid of medium curing cutback asphalt?, MC-30, MC-70, MC-250, MC-800, ASTM C150 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%. What will be the 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 the consistent results., What is the required length of pipe specimen in the determination of zinc coating of galvanized pipe?, 6 in, 4 in, 2 in, None of the Above, Quality control testing in a DPWH project is the responsibility of, DPWH, Contractor, DPWH and Contractor, Construction Supervision Consultant, The test to indicate the temperature wherein asphalt can be heated without catching fire is called:, Loss on heating, Spot test, Flash point, Penetration test, Cutback asphalt or emulsified asphalt is usually for:, Prime coating, Tack coating, Seal coating, Either b or a, For RCPC, the laying length used in calculating the strength values of the barrel pipe is the:, Outside length, Inside length, Standard length, None of the Above, For efficient compaction, the embankment materials should at the time of rolling be:, Dry, Wet, At Optimum Moisture Content, At Maximum Moisture Content, Which of the following provisions is not included in the job-mix formula?, Mixing time, Grading of aggregates, Asphalt cement, Temperature at delivery, The smaller the value of the fineness modulus, the:, Coarser the material, Finer the material, The lighter the material, The drier the material, , Maybe accepted, subject to price adjustment, Considered adequate, Considered inadequate, May be record at the initiative of DPWH, Under D.O. 98, series of 2016, Revised Guidelines on the Accreditation of Contractors’ and Consultants’ Materials Engineers, which is NOT true in the Limits of Assignment of Accredited Materials Engineer, Non-accredited Materials Engineer – Three (3) projects with an aggregate cost of not more than P15M, Materials Engineer I – Two (2) projects with an aggregate cost of not more than P200M, Materials Engineer II – Two (2) projects with an aggregate cost of not more than P300M, Materials Engineer II – Three (3) projects with an aggregate cost of not more than P250M, The best way to determine the temperature of the delivered asphalt mix is with a dial and armored stem thermometer. The stem should be inserted sufficiently into the mixture to a depth of at least:, 2 in, 4 in, 6 in, 8 in, Which of the following gauge number of G.I. sheets will give the lower thickness?, Gauge # 32, Gauge # 31, Gauge # 26, Gauge # 18, The measurement of the thickness of an asphalt core using a caliper is based on:, 4 sides, 5 sides, 6 sides, 9 sides, The purpose of conducting laboratory CBR test on the fill materials for embankment is to check:, Permeability of the compacted subgrade material, Swelling characteristics of the subgrade material, Bearing capacity of subgrade material, All of the Above, What is the significance of the loss of ignition test of cement?, It is a measure of the heat generated when cement is mixed with water, It signifies pre-hydration or 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, Blended hydraulic cement type IP requires a compressive strength requirement of _____., 25 MPa min, 25 MPa max, 28 MPa min, None of the Above, A transit mixer for road construction was found to have a 6” slump of fresh concrete instead of the required 3”. What will you recommend if you are the 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 index of retained strength of the compacted bituminous mixtures is the ratio of the compressive strength of immersed and dry bituminous mixture. What is the minimum index of retained strength required for bituminous mixture?, 40%, 50%, 60%, 70%, Where do we take additional cores when the measurement of any core taken from the pavement is deficient in thickness by more than 25 mm?, 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, The main problem associated with wrong practice of conveying concrete is called:, Honeycomb, Laitance, Segregation, Cracking, What is the minimum soaked CBR value required for base materials obtained at the maximum dry density determined by AASHTO T180 Method D?, 25, 50, 75, 80, The asphalt material that is usually classified by its penetration grade is, Joint filler, Emulsified asphalt, Cutback asphalt, Asphalt cement, The moisture-density curve is different for each soil. Which of the following statements is/are true?, Granular, well-graded soils generally have fairly high maximum densities at low optimum moisture content, Clay soils have lower densities at optimum moisture content than granular, well-graded soils, Granular, well-graded soils have higher densities than uniform soils at OMC, All of the Above, Retarders are more useful during:, Cold weather, Hot weather, Freezing weather, Warm weather, Slump test is the measure of workability of concrete mixture. Which is NOT the type of concrete slump?, Shear slump, Collapse slump, True slump, False slump, In slip-form construction, what is the slump of concrete used?, Not more than 3 inches, 3 – 4 inches, Almost 0, Any of the Above, When taking three or more samples of aggregates to be combined for one materials sample:, The small samples must be packed in separate samples bags, The small samples must be obtained from different lots, The small samples should of approximately equal size, None of the Above, The actual strength concrete in-place in an area presented by failed beam samples can be determined by means of:, Slump test, Core test, Stability test, Extraction test, What chemical admixture is needed to produce a concrete mix with improved slump without additional water?, Set accelerating admixture, Set retarding admixture, Water reducing admixture, Fly ash, 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, Cement stiffening without strength development is called _____., False set, Flash set, Premature set, None of the Above, Penetration test for asphalt cement is a measure of:, Consistency, Solubility, Ductility, Fluidity, Which is not included in the three phases of rolling operations in asphalt pavement?, Breakdown rolling, Primary rolling, Intermediate rolling, Final rolling, The mortar proportion of stone masonry shall be, One-part cement, two-parts sand, One-part cement, three-parts sand, One-part cement, four-parts sand, One-part cement, one-part sand, Which schedule No. of G.I. Pipe will give a high wall thickness?, Schedule 80, Schedule 40, Schedule 20, None of the Above, From materials point of view, subgrade preparation construction consists mainly of, Identification and treatment of unsuitable materials, Compaction of the top layer of cuts, Compaction of the whole depth of material in embankments, All of the Above.

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