Test 26 - Aggregate Specific Gravity, Absorption, Moisture and Bulking

Question 1 ప్రశ్న 1

Which combination of aggregate properties is principally covered by IS 2386 (Part 3)?

A Specific gravity, density, voids, water absorption and bulking B Impact value, crushing value and abrasion only C Particle-size distribution and flakiness only D Soundness and alkali-aggregate reactivity only

Question 2 ప్రశ్న 2

Which description correctly represents the saturated surface-dry (SSD) condition of an aggregate?

A Permeable pores are filled with water, but no free water film remains on the particle surface. B All internal pores and the external surface are completely dry. C The aggregate contains surface water but its permeable pores are empty. D The aggregate is completely submerged in water during weighing.

Question 3 ప్రశ్న 3

Which expression correctly gives aggregate water absorption as a percentage of oven-dry mass when WSSD is the saturated surface-dry mass and WOD is the oven-dry mass?

A 100(WSSD − WOD)/WOD B 100(WSSD − WOD)/WSSD C 100WOD/WSSD D 100(WSSD + WOD)/WOD

Question 4 ప్రశ్న 4

An aggregate sample weighs 2000 g in the oven-dry condition and 2040 g in the saturated surface-dry condition. What is its water absorption?

A 1.0 percent B 2.0 percent C 4.0 percent D 40 percent

Question 5 ప్రశ్న 5

Which statement correctly distinguishes water absorption from surface moisture of aggregate?

A Absorption is water held in permeable particle pores up to SSD condition, while surface moisture is free water present outside the particles above SSD condition. B Absorption and surface moisture are two names for exactly the same water. C Surface moisture exists only inside aggregate pores. D Absorption occurs only after the aggregate becomes wetter than SSD.

Question 6 ప్రశ్న 6

One kilogram of oven-dry sand has an absorption capacity of 2 percent. Its actual wet mass at batching is 1.050 kg. Assuming the pores are fully saturated, how much of the 50 g total water is free surface water?

A 20 g B 30 g C 50 g D 70 g

Question 7 ప్రశ్న 7

An aggregate has an absorption capacity of 2 percent but enters the concrete mixer with an actual moisture content of only 1 percent, both percentages being based on oven-dry mass. What is the most appropriate interpretation?

A It is wetter than SSD and contributes 1 percent free water. B It is below SSD and may absorb approximately 1 percent of its oven-dry mass from the mixing water. C It is exactly in SSD condition. D Its moisture condition cannot influence effective water content.

Question 8 ప్రశ్న 8

A concrete mix requires 800 kg of fine aggregate in SSD condition. The available sand contains 3 percent free surface moisture by mass of SSD aggregate. What wet mass of sand should be batched, and by how much should the externally added mixing water be reduced?

A 800 kg sand and 24 kg additional water B 824 kg sand and 24 kg less added water C 824 kg sand and 24 kg additional water D 776 kg sand and no water correction

Question 9 ప్రశ్న 9

Which statement correctly distinguishes bulk specific gravity based on oven-dry aggregate from apparent specific gravity?

A Bulk specific gravity accounts for the aggregate bulk particle volume including permeable pores, whereas apparent specific gravity excludes the volume of permeable pores. B Apparent specific gravity includes all inter-particle voids in a stockpile. C Bulk specific gravity is always greater than apparent specific gravity. D The two values are defined solely from loose bulk density.

Question 10 ప్రశ్న 10

In a coarse-aggregate specific-gravity test, the saturated aggregate weighs 1250 g while suspended in water, 2000 g in SSD condition in air, and 1960 g after oven drying. Using Gdry = WOD/(WSSD − Wsubmerged), what is the approximate oven-dry bulk specific gravity?

A 2.00 B 2.45 C 2.61 D 2.76

Question 11 ప్రశ్న 11

Using the same test data—1250 g submerged mass, 2000 g SSD mass and 1960 g oven-dry mass—which set of approximate values is correct for SSD specific gravity, apparent specific gravity and water absorption respectively?

A 2.67, 2.76 and 2.04 percent B 2.61, 2.00 and 4.00 percent C 2.76, 2.61 and 0.80 percent D 2.00, 2.67 and 20.4 percent

Question 12 ప్రశ్న 12

Why is apparent specific gravity generally greater than oven-dry bulk specific gravity for an absorptive aggregate?

A Apparent specific gravity excludes permeable pore volume from the effective aggregate volume used in its calculation. B Apparent specific gravity includes stockpile voids while bulk specific gravity does not. C Apparent specific gravity uses the loose bulk density as its numerator. D Water absorption automatically reduces the mass of SSD aggregate.

Question 13 ప్రశ్న 13

Which statement correctly describes aggregate bulk density?

A It is the mass of aggregate occupying a given bulk volume, including the inter-particle voids present under the specified packing condition. B It is the same property as particle specific gravity. C It excludes all void spaces between aggregate particles. D It is independent of compaction and moisture condition.

Question 14 ప్రశ్న 14

A 15-litre cylindrical measure contains 24.0 kg of aggregate after the specified filling procedure. What is its bulk density?

A 0.625 kg/L B 1.60 kg/L C 15.0 kg/L D 16000 kg/m³

Question 15 ప్రశ్న 15

For the same aggregate and moisture condition, why is rodded bulk density normally greater than loose bulk density?

A Rodding improves particle packing and reduces inter-particle void volume within the measure. B Rodding increases the specific gravity of the aggregate minerals. C Loose aggregate contains no inter-particle voids. D Rodding chemically increases the mass of each particle.

Question 16 ప్రశ్న 16

An oven-dry aggregate has a specific gravity of 2.65 and a bulk density of 1.59 kg/L. Using Voids (%) = (1 − Bulk density/Specific gravity) × 100, what is the approximate void content?

A 20 percent B 30 percent C 40 percent D 60 percent

Question 17 ప్రశ్న 17

An aggregate of specific gravity 2.65 has a loose bulk density of 1.45 kg/L and a rodded bulk density of 1.65 kg/L. Which statement is correct?

A The loose condition has about 45 percent voids and the rodded condition about 38 percent voids. B The loose condition has about 38 percent voids and the rodded condition about 45 percent voids. C Both conditions necessarily contain zero voids. D Rodding changes the aggregate specific gravity from 2.65 to 1.65.

Question 18 ప్రశ్న 18

What is the fundamental cause of bulking of moist fine aggregate?

A Thin moisture films and surface-tension effects separate sand particles, increasing their apparent loose volume. B Water chemically increases the mineral specific gravity of every sand particle. C Moisture causes the individual sand grains to permanently increase in solid volume. D Bulking occurs because cement hydration begins inside the sand.

Question 19 ప్రశ్న 19

Which statement about the relationship between moisture content and bulking of sand is generally correct?

A Bulking develops at relatively low moisture contents, may reach a maximum at an intermediate moisture content, and largely disappears when the sand becomes fully inundated. B Bulking increases indefinitely as more water is added. C Completely dry sand always has the maximum possible bulking. D Submerged sand necessarily has greater bulking than damp sand.

Question 20 ప్రశ్న 20

Why does fine sand generally show greater bulking than coarse sand for comparable moisture conditions?

A Finer sand has greater surface area per unit mass, so moisture-film effects influence a larger particle surface. B Fine sand always has a higher mineral specific gravity. C Coarse sand cannot contain any surface moisture. D Bulking depends only on cement content and not on aggregate size.

Question 21 ప్రశ్న 21

In a field bulking test, damp sand occupies a depth of 30 cm in a uniform container. After the sand is completely inundated and consolidated, its depth is 24 cm. What is the percentage bulking?

A 20 percent B 25 percent C 30 percent D 80 percent

Question 22 ప్రశ్న 22

In a measuring-cylinder field test, damp sand initially occupies 200 mL. After sufficient water is added and the sand is stirred and inundated, it occupies 160 mL. What is the percentage bulking of the damp sand?

A 20 percent B 25 percent C 40 percent D 80 percent

Question 23 ప్రశ్న 23

A nominal volumetric concrete proportion requires 0.50 m³ of dry-equivalent sand. Field testing shows that the damp sand has 25 percent bulking. What loose volume of the damp sand should be measured to supply approximately the intended quantity?

A 0.40 m³ B 0.50 m³ C 0.625 m³ D 0.75 m³

Question 24 ప్రశ్న 24

If strongly bulked damp sand is measured by volume but no bulking correction is applied, what is the principal consequence for a nominal volumetric concrete mix?

A Less actual sand is batched than intended, so the resulting mixture becomes richer in cement paste relative to fine aggregate. B More dry sand is automatically batched than intended. C The specific gravity of cement decreases. D The coarse aggregate changes into fine aggregate.

Question 25 ప్రశ్న 25

Why is bulking primarily a practical concern with fine aggregate rather than normal coarse aggregate?

A Fine aggregate has much greater surface area per unit volume, making moisture-film separation effects substantially more important. B Coarse aggregate is incapable of absorbing any water. C Fine aggregate alone possesses specific gravity. D Coarse aggregate always remains oven dry at construction sites.

Question 26 ప్రశ్న 26

A manufactured aggregate covered by the normal IS 383:2016 manufactured-aggregate requirement has a measured water absorption of 6 percent and does not qualify for the recycled-aggregate relaxation. If the normal maximum is 5 percent, what is the correct conclusion?

A It satisfies the requirement because any value below 10 percent is universally permitted. B It does not satisfy the stated normal 5 percent water-absorption limit. C It automatically becomes natural aggregate. D Water absorption has no relevance to aggregate specification.

Question 27 ప్రశ్న 27

Consider the following statements about aggregate moisture and volume properties:
1. SSD aggregate has its permeable pores filled but has no free surface water.
2. Aggregate wetter than SSD can contribute free water to the concrete mixture.
3. Aggregate drier than SSD may absorb part of the added mixing water.
4. Bulk density and particle specific gravity are necessarily numerically identical because both involve mass and volume.

Which statements are correct?

A 1 and 2 only B 1, 2 and 3 only C 2, 3 and 4 only D 1, 2, 3 and 4

Answer Key || సమాధానాల పట్టిక

Related Quizzes || సంబంధిత క్విజ్‌లు

Civil HMWSSB, Unit 1 - Building Materials and Construction Quiz

TGPSC HMWSSB Quiz

Answer Key సమాధానాల పట్టిక

Related Quizzes సంబంధిత క్విజ్‌లు