Question 2: Quality of lime is determined by factors as:

Question 3: Major raw material to produce hydraulic lime is ….in which clay content is ...…%

Question 4: In Asphalt, redundant porous is a total ……of fine pores presenting in bitumen layer which covers aggregates of an asphalt mixture ........being compacted. The unit of the redundant porous is % by volume of asphalt mixture.

Question 5: the finess of cement is …..

Question 6: Steel bar used in construction is ……..carbon steel, carbon content is not over.........

Calculate bulk density of Asphalt as we know that bitumen specific density is 1.05g/cm³, mineral aggregate has bulk density of 1.85kg/lit and porous degree of 18.6% by volume. We assume that redundant porous degree of Asphalt is 4.5% by volume and bitume only fills voids arranging among mineral aggregate particles.

Question 8: Construction gypsum is a binder hardening in ….., and chemical formulation is:…….

Question 9: With Portland cement, major mineral compound determining compressive strength of hardened cement is:

Question 10: Basing on rock origin, natural rocks are classified as:

Question 11: With burned clay, major compound is:

Question 12: The mineral compound of clinker having lowest hydration heat (Cal/gam) is

Question 13: The role of gypsum rock added to clinker grinding process is:

Question 14: Dust and clay presenting on aggregate surface is …., these agents cover aggregate and ..….. adhesion between cement paste and aggregate, and ….. concrete compressive strength.

Question 15: With the same slump value, fresh concrete using crushed stone has ….. mixing water content when compared to those of the fresh concrete using gravel.

Question 16: The finess modulus of sand increasing makes concrete…….…..

Question 17: Concrete compressive strength depends on:

Question 18: Concrete is classified basing on:

Question 19: Property of Asphalt depends on........:

Question 20: Yield strength of steel is tensile stress at which the redundant strain is .........                    

Question 21: We have concrete mix proportion as:

                  Cement (C) = 360kg                                     Water (W) =190 lít

                  Sand (S) = 680kg                                          Coarse aggregate (CA) = 1150kg

Specific heats of C, S, CA are 0.24 kcal/kg.⁰C, and specific heat of water is 1 kcal/kg.⁰C.

Let’s calculate heat capacity Q (kcal) which is used to increase temperature of fresh concrete from 30⁰C up to 80⁰C.

Question 22: What is the thickness of glass board used to replace wood board with a thickness of =150mm?

We know:  - Temperatures on 2 faces of the board are 120⁰C and 22⁰C.

                 - Wood boar has = 0,07 kcal/m.h.⁰C.

                 - Glass board has = 0,03 kcal/m.h.⁰C.

                 - Thermal constant is = 0,002.

Question 23: The dried rock specimen has weight of 100g when balanced in air. After fully covered by 1.08g Parafin, the weight of the specimen 59.88g when balanced in water. Let’s calculate bulk density of the rock specimen. The specific density of parafin is 0.9g/cm³.

Question 24: The wet bulk density of a material at moisture of 5% is 2.25kg/dm³ and that is 2.32kg/dm³ at water saturated condition. The specific density of this material is 2.72kg/dm³. Let’s calculate water saturated factor of this material as the volume of the material does not change with changing moisture ?               

Question 25: There is a material having specific density of 2.74 g/cm³ and porous degree of 22%. Let’s determine bulk density of this material at moisture W = 6%? We know that volume of this material increases 0.12% with increasing 1% moisture.

Question 26: Let’s determine thermal conductive factor (kcal/m.h.⁰C) at temperature of 0⁰C of a material having square section with size of 0.8m? This material has thickness = 2.6cm. The outside temperature is t₁ =90⁰C and inside temperature is t₂ =25⁰C. Heat capacity is 350kcal, thermal factor is =0.002, thermal conductive period is 1 hour.

Question 27: In a concrete mix proportion, cement content is 300kg, water to cement ratio (N/X) is 0.6. Chemical bound water content is 20% by cement weight. Let’s determine porous degree (r,%) of concrete due to free water after finishing concrete hardening?

Question 28: How many bricks with size of 9x9x19cm can be produced from 10 Tons of clay? We know that bulk density of the brick is 980kg/m³, the clay has moisture of 12%, and ignition loss is 8%.

Question 29: Let’s determine quality factor of a brick ? We know that bulk density of the brick is 1750kg/m³ when the moisture is 5%, and compression strength is 70kG/cm².

Question 30: How much gypsum stone is used to produce 12 Tons of construction gypsum ? We know that the gypsum stone has 85% CaSO₄.2H₂O and moisture of 2%.

Question 31: A dried sand sample has weight G = 1000g. After finishing sieve analysis, the accumulated retaining content is shown in the table below. Let’s determine finess modulus of this sand (M_đl) ?

Question 32: A dried stone sample has weight G = 10000g. After finishing sieve analysis, the individual retaining content is shown in the table below. Let’s determine D_max of this stone?

Question 33: A dried stone sample has weight G = 10000g. After finishing sieve analysis, the individual retaining content is shown in the table below. Let’s determine D_min of this stone?

Question 34: A concrete mix proportion has N/X = 0.5 then compression strength is 40MPa. Let’s determine the compression strength of this concrete when N/X is 0.6. The Bolomey – Skramtaev formulation is used to design concrete mix proportion.

Question 35: Let’s calculate PCB40 cement content (kg) used in the concrete mix proportion? The designed concrete compression strength is 30MPa. We know that initial water content is chosen as 190 lit and the concrete mix proportion is designed by Bolomey – Skramtaev formulation (Aggregate quality is moderate).

Question 36: The concrete mix proportion is as: X=340kg, N=200lit, C=700kg, Đ=1150kg. Let’s calculate yield factor of this concrete mixture as the bulk densities of cement, sand and crushed stone are 1.05kg/l, 1.35kg/l and 1.45kg/l respectively.

Question 37: Aggregate has good quality. Cement has compression strength of R_x = 450daN/cm². Let’s calculate concrete compression strength with N/X = 0.52. The Bolomey – Skramtaev formulation is used.

Question 38: A steel bar has diameter of 12.8mm being fractured under tensile stress of 460MPa. Let’s determine the real tensile stress in the steel bar as the diameter of the steel bar is 10.7mm at break.

Question 39: Let’s calculate bitumen content used in a Asphalt ? We know that bitumen has specific density of 1.05g/cm³, mineral aggregate has bulk density of 1.8kg/lit and porous degree of 16.6% by volume. Assume that redundant porous degree of Asphalt is 4.3% by volume and bitume only fills voids arranging among mineral aggregate particles.

Question 40: Concrete grade is ….. strength of cubic specimen with size of …. , casted and cured in standard condition, and tested at …. days age.