ME Practical Problems PDF

What is not required in conducting nuclear density test? -The operator must be licensed -Radiation exposure limits must be specified *The operator must wear thick clothes -Units must be delivered in approved cases Which of the following is not the responsibility of a materials engineer? -Get...

What is not required in conducting nuclear density test? -The operator must be licensed -Radiation exposure limits must be specified *The operator must wear thick clothes -Units must be delivered in approved cases Which of the following is not the responsibility of a materials engineer? -Getting samples for testing -Analyzing test results *Setting schedule for delivery of materials -Recording the concreting activity in the materials logbook Where should the contractor’s Materials Engineer directly report? -DPWH Project Engineer -DPWH Materials Engineer *Contractors Project Engineer -All of the above Which of the following documents is prepared by a Materials Engineer? *Materials Logbook -Quality Control Program -Program of Works -Minimum Testing Requirements It is found that the compaction of embankment is 80%. It is below the required 100% compaction. As a materials engineer, what should you do? -Accept the embankment -Adjust the water content -Accept the embankment but at adjusted price *Use rollers with higher compactive efforts Which of the following is not a job of a materials engineer? -Submits samples for testing -Prepares design mix -Checks job mix formula *Surveys and measures line and grade at site During construction of a road project, if all the materials to be used are tested for quality, inspection is no longer required. -True *False Sample should be taken and sent to the regional offices or any private testing laboratories accredited by DPWH for testing, with a ________. -Laboratory result *Sample Card -Laboratory Testing card -Identification card As a Materials Engineer, what will you do with major honey-combed area that is considered as defective work? -Plaster -Payment of the concrete will be made at adjusted price *Removed and replaced at the expensed of the contractor -Accept the work If the strength of control specimen does not meet the requirements and not feasible to obtain cores due to structural consideration, as a Materials Engineer what will be your decision? -Removed and replaced -Area will not be paid *Payment will be made at an adjusted price -Request for materials certificate before acceptance A program of quality control works to be complied by the contractor which is prepared by DPWH: *Quality Control Program -Logbook -Minimum Testing Requirements -Sample Card Prescribed in each project based on the estimated quantities. The requirements specify the kind and number of tests for each item of work: -Materials Logbook -Monthly Materials Report *Minimum Testing Requirements -Program of Works In the construction of bridge projects, what is the method used to determine the casting length of the regular piles? -Test pitting *Test piling -Steel testing -All of the above What is the basis of acceptance or rejection of any construction materials? -Inspection report *Materials test report -Quality control assurance report -Mill Certificate The monthly materials status report is submitted to DPWH on or before: -7th day of the month -15th day of the month -5th day of the month *25th day of the month In a material engineers’ point of view, subgrade preparation is: -Compaction of soil topping of cut fills -Compaction of materials in embankment -Determination and treatment of unsuitable materials *All of the above In concrete acceptance, core will be considered adequate if the average strength of the cores is equal to what? -80% of f’c & if no single core is less than 75% of specified f’c -90% of f’c & if no single core is less than 80% of specified f’c *85% of f’c & if no single core is less than 75% of specified f’c -100% of f’c & if no single core is less than 85% of specified f’c The contractor shall submit in writing a job-mix formula for the mixture supported by laboratory test data along with samples of resources of components and viscosity – temperature relationships to the Engineer for testing and approval at least _____. -Two weeks -One week *Three weeks -Four weeks When a completed asphalt pavement exhibits too much voids, it is usually caused by the following except _______. -Rolling the mixture below the temperature requirements -Too much course aggregates -Too little binder *Too much fine aggregates In identifying project location intended for asphalt pavement, which of the following criteria is not appropriate to recommend? -Drainage facilities is well-maintained. -Location is not a typhoon built area. -Existing base course is stable *Flood – prone section When the value of G.I. is negative, what will be the soil performance? -Poor subgrade *Very good subgrade -Good subgrade -None of the above If the strength of Item 311 control specimens does not meet the requirements for acceptance of concrete and it is not feasible to obtain cores from the structure due to structural consideration, as a materials engineer, what will you recommend? -The strength of in-place concrete will be determined by rebound hammer *Pavement of concrete will be made at an adjusted price -No payment will be made on the concrete represented by failed specimens. -The contractor will be required to remove and replace the concrete represented by the failed specimens at his own expense. Scaling of newly constructed concrete pavement is an evidence of inadequate quality control. This is caused by high ____. -Fineness Modulus -Slump -Fine aggregates content *Bleed water If the splitter is not available, the proper way of sampling aggregate base course in the laboratory. -Scoop the samples in the middle of the sack. -Spread the samples on the ground and take the samples in the middle *Spread the samples on the ground and divide the samples into four take two opposite parts from it -Scoop for samples at the side of the sack. Quality determination of concrete course aggregate sample requires: -Abrasion test -Sieve analysis -Stability *Both A and B The used of manufactured fine aggregates will generally require more: *Mixing water -Fine aggregate -Course aggregate -Both a and b Requirement of PCCP Construction: *Opening to traffic after 14 days the concrete was placed -Opening to traffic after 28 days the concrete was placed -A compressive strength of 25.08 Mpa or more -None of the above In asphalt pavement construction, after spreading bituminous mix, compaction will follow where rolling shall begin at the sides and proceed longitudinally parallel towards the road centerline, each trip overlapping ____ of the roller width, gradually progressing to the crown of the road. *1⁄2 -1 -1 1⁄2 -2 For small project where quantity of steel bars is 10,000 kg or less, what is the basis for acceptance of the material/ -Test result *Mill certificate -P.E. certificate -None of the above Immediately after the finishing operations have been completed and the concrete sufficiently set, the surface of the newly – placed concrete shall be cured for a period of ___ hours. -48 -24 *72 -96 If concrete cylinder sample for RCPC is not available for compressive test, one (1) whole piece RCPC for every 50 pieces RCPC will be submitted for quality test. -True *False -Maybe -None of the above What is the average deficiency in thickness of core specimen per lot where no payment is recommended on the project? -More than 20mm *More than 25mm -More than 15mm -More than 5mm The recommended type of Portland Cement to be used in concreting unless otherwise provided for in the special provision. -Type I-P *Type I -Type II & V -Type IV When the average thickness per lot is deficient by 7mm, which of the following is true? *Payment for the lot shall be adjusted -Accept the lot without price adjustment -Remove and replace at the expense of contractor -Get core sample to re-check the thickness of the pavement The higher the value of PI of the soil, the weaker the performance of the soil will be. *True -False -It depends -None of the above As construction work progresses, you noticed that the delivered materials are different from the on tested passed. If you are in doubt, what will you do? *Conduct immediate re-testing -Accept the materials -Accept at an adjusted price -Reject the materials When is the right time the compaction must be performed in order to attain the required density? -When the equipment is ready -It depends on the contractor *When the mixture is still hot and workable -As soon as the materials are ready Test conducted for building three stories and above: -Test pitting -Soil exploration *Boring test -None of the above Refers to the process of mixing before determining the degree of compliance of delivered or constructed materials with the specifications: -Materials testing *Sampling -Inspection report -None of the above Tests conducted in the field for road construction: -Field density test -Slump test *All of the above -None of the above Required boring in large buildings: -1 hole at each corner only -5 holes at random *1 hole at each corner and 1 at the center -Any of the above Consist of work elements carried out which contribute to the quality control: -Materials Testing -Quality Assurance work -Monthly materials report *Quality Control work Summary of all field control tests submitted monthly by the contractor. -Materials Testing -Quality Assurance work *Monthly materials report -Quality control work Which of the following is not the responsibility of the Materials Engineer? -Sampling of material -Design of concrete mix *Scheduling of delivery of materials -Analysis of test result of material The curing of the pavement is done by means of: -Covering the concrete with mats saturated with water -Thoroughly wetting the pavement -applying curing compound immediately after finishing of the surface *All of the above A program of quality control works to be complied by the contractor which is prepared by DPWH: *Quality Control program -Logbook -Minimum Testing requirements -All of the above As a Materials Engineer, how can you determine that the sample placed in the oven is already oven – dried? *If the sample reaches its constant weight -If there are no more vapors coming out from the sample -If 105 deg C temperature was reached -All of the above In a stockpile of soil aggregates, where is the proper location of sampling? *Bottom, Middle & Top -Bottom only -Bottom and Top only -Middle part In delivering samples of concrete cylinders to Laboratory for testing, which of the following is a correct? -Bring the samples with bare hand -Bring the samples inside steel-plate container *Put the samples inside container with saw dust or palay -All of the above Preparation of slump test for concrete is performed by: *prepared in 3 layers, each layer is rodded 25 times. -prepared in 3 layers, each layer comprises 1/3 of the height of the slump cone. -All of the above -None of the above What is the sample used for building projects? -beam sample -cube sample *cylinder sample -pipe sample Who will bring the sample for testing to DPWH accredited laboratory for materials testing? -DPWH Materials Engineer *Contractor’s Materials Engineer -DPWH & Contractor’s Materials Engineers -All of the above As Materials Engineer, when is the right time to start sampling and testing fine And course aggregates? *Once the source is identified -Prior to billing -Once testing equipment is ready -At the end of the trial mix The best test to evaluate the quality of manufactured RCPC is: -Engineer’s Certificate -Inspection Report -Test of concrete cylinder *Test of concrete pipe. If the temperature of the ordered asphalt is 20 deg Celsius lower than the job mix temperature, as a Materials Engineer what will you do? -Adjust job mix formula *Do not accept the asphalt -Accept the asphalt -Advice the contractor to lay asphalt in one-layer only What to do if the result of concrete testing is observed to be deficient by 15%? -Accept the pavement without adjustment in price -Reject the pavement *Payment of the concrete will be made at an adjustment price -Remove & replaced the pavement represented by failed samples ASTM 150 requires 27.6 MPA for 28th day compressive strength of mortar made of type 1 Portland Cement. Three specimen were tested, 2 passed but 1 failed by more than 20%. As Materials Engineer what will be your conclusion? -Accept the cement -Do not accept since the result is inconclusive *Get the average of 3 specimens and if the average exceeds 27.6 Mpa the cement pass the specifications. -The cement does not pass the specifications since the result is inconsistent Why we add emulsifying agent in emulsified asphalt? -To create emulsion -To improve the resistance of the asphalt to common defects -To ensure bond between asphalt materials and binding aggregates *To make water and asphalt combine What is the purpose of concrete curing? -To smooth the surface of concrete -To maximize concrete strength *To extend the development of strength -To minimize cracking Sample of aggregates base course materials when tested for quality passed the requirements except grading. What will you recommend as Materials Engineer? -Reject the material -Replace the material -Accept the material at an adjusted price *Reprocess the material by blending