Cementitious materials Study guides, Class notes & Summaries

Describe passivation - ANSWER-Passivation is the formation of a protective oxide Film on the surface reducing its chemical activity and its ability to corrode Describe the following factors and how they affect corrosion - ANSWER-Oxygen: oxygen increases the rate of corrosion temperature Temperature: corrosion usually accelerated with increasing temperature Chemical salts: increase the rate of corrosion by increasing the efficiency of the electrolyte humidity: the wetter the environment,...

RCDD TEST QUESTIONS (TOPIC 8 - TOPIC 14) WITH VERIFIED ANSWERS 2024/2025 Firestop ________, in conjunction with steel wedging plates, go in a steel cable tray. A. Bag B. Block C. Intumescent sheet D. Silicone foams - answerA. Bag Which of the following is a nonmechanical firestop system? A. Cable transit system B. Firestop blocks C. Fire rated pathway device D. Factory fabricated sleeve system - answerB. Firestop blocks What type of material does NOT support combustion even under ac...

P2 BTECH EXAM QUESTIONS & ANSWERS 2024/2025 Cavity wall - ANSWERSA masonry wall that includes a continuous airspace between its outermos twythe and the remainder of the wall. Rubble - ANSWERSUnsquared stones Mortar - ANSWERSA substance used to join masonry units, consisting of cementitious materials, fine aggregate, and water. Rowlock - ANSWERSIt is a brick laid horizontally on the longer edge with the shorter end exposed Tilt-up construction - ANSWERSA method of constructing co...

How are Natural Asphalts formed? - When crude petroleum oils rose to the earths surface and formed pools, The action of the sun and wind drove off the lighter oils and gases, leaving a heavy residue. What are the differences in asphalt and tar? - Asphalt- a dark brown black cementitious material, solid or semisolid in consistency, in which the predominating constituents are bitumens which occur in nature such as or are obtained as residue in refining petroleum. Tar-brown or black bituminou...

How are Natural Asphalts formed? - When crude petroleum oils rose to the earths surface and formed pools, The action of the sun and wind drove off the lighter oils and gases, leaving a heavy residue. What are the differences in asphalt and tar? - Asphalt- a dark brown black cementitious material, solid or semisolid in consistency, in which the predominating constituents are bitumens which occur in nature such as or are obtained as residue in refining petroleum. Tar-brown or black bituminou...

unconfined aquifer correct answers The bottom flow boundary is defined by the aquiclude, but upper flow boundary (The groundwater table) is free to reach its own natural level. secondary consolidation correct answers Continuing settlement even after all pore pressures have dissipated Mohrs Circle correct answers Graphical representation of the relationship between normal stress and shear stress (transformation equations for plane stress) Quick Clay correct answers A water-saturated clay...

Describe air turns - eliminates air stratification. 1-2 Turns is sufficient Below what RH does corrosion virtually cease? - 40% 2 ways to reduce RH of boundary layer- - increase surface temp & dehumidification 2 types of dehumidification equipment: - refrigerant & desiccant Benefits of dehumidification - dries air, lowers dew point, holds surface during coating application, holds blast with dry air, permits blasting the entire surface. Electronic Hydrometers - test RH, air temp, dew point...

Definitions The water/cement ratio (w/c) is the weight of water divided by the weight of cement. When supplementary cementitious materials (SCM’s) are used, the w/c is referred to as the water/cementitious materials ratio (w/cm) and is the weight of water divided by the weight of cement and SCM’s. These terms are sometimes used interchangeably.

How are Natural Asphalts formed? - When crude petroleum oils rose to the earths surface and formed pools, The action of the sun and wind drove off the lighter oils and gases, leaving a heavy residue. What are the differences in asphalt and tar? - Asphalt- a dark brown black cementitious material, solid or semisolid in consistency, in which the predominating constituents are bitumens which occur in nature such as or are obtained as residue in refining petroleum. Tar-brown or black bituminou...

RCDD TEST QUESTIONS (TOPIC 8 - TOPIC 14) ANSWERED CORRECTLY!! Firestop ________, in conjunction with steel wedging plates, go in a steel cable tray. A. Bag B. Block C. Intumescent sheet D. Silicone foams A. Bag Which of the following is a nonmechanical firestop system? A. Cable transit system B. Firestop blocks C. Fire rated pathway device D. Factory fabricated sleeve system B. Firestop blocks What type of material does NOT support combustion even under accelerated conditions?...