Podcast
Questions and Answers
What is the usual liquid used in determining the specific gravity of cement?
What is the usual liquid used in determining the specific gravity of cement?
- Gasoline
- Vinegar
- Water
- Kerosene (correct)
Fineness of cement affects which of the following? (Select all that apply)
Fineness of cement affects which of the following? (Select all that apply)
- Rate of hydration (correct)
- Gypsum requirement (correct)
- Amount of clinker produced
- Cost of heating
List one of the four ingredients of cement.
List one of the four ingredients of cement.
Silicon, Calcium, Aluminum, or Iron
What do we call the ability of cement not to undergo large change in volume during hydration?
What do we call the ability of cement not to undergo large change in volume during hydration?
What is the basis of the strength of cement?
What is the basis of the strength of cement?
What is the standard specific gravity of cement?
What is the standard specific gravity of cement?
The term hydration refers to the chemical reaction between cement, water, and aggregates.
The term hydration refers to the chemical reaction between cement, water, and aggregates.
Which are the physical properties of aggregates? (Select all that apply)
Which are the physical properties of aggregates? (Select all that apply)
Which one is the ideal texture of aggregates for a concreting job?
Which one is the ideal texture of aggregates for a concreting job?
What is considered the best shape of coarse aggregates for a concreting job?
What is considered the best shape of coarse aggregates for a concreting job?
If the percentage absorption of aggregate is 5%, what is its specific gravity at oven dried condition if the specific gravity at SSD condition is 2.35?
If the percentage absorption of aggregate is 5%, what is its specific gravity at oven dried condition if the specific gravity at SSD condition is 2.35?
What compound prevents flash setting?
What compound prevents flash setting?
Which one is the desired grain size distribution or grading of aggregates to produce good concrete?
Which one is the desired grain size distribution or grading of aggregates to produce good concrete?
Among the choices, which are the mechanical properties of aggregates?
Among the choices, which are the mechanical properties of aggregates?
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Study Notes
Cement Composition and Properties
- Specific gravity of cement is typically determined using water.
- Fineness of cement impacts multiple aspects: cost of heating, rate of hydration, and amount of clinker produced.
- Key ingredients of cement include: Silicon, Calcium, Aluminum, Iron.
- Cement's ability to maintain a stable volume during hydration is referred to as shrinkage resistance.
- The strength of cement is primarily based on standards like ASTM C348 and ASTM C109.
- Standard specific gravity for cement is 3.15.
- Hydration involves a reaction among cement, water, and aggregates.
Pozzolans and Their Characteristics
- Pozzolans are materials that react with calcium hydroxide and contribute to cement's strength and durability.
Aggregates and Their Properties
- Maximum size of aggregates is based on the dimension of concrete members and spacing of rebars.
- Specific gravity at oven-dried condition can be calculated from SSD condition and percentage absorption.
- Inert materials occupying a considerable volume of concrete are termed aggregates.
- Key physical properties of aggregates include absorption, grading, soundness, and specific gravity.
- Ideal texture for aggregates in concrete work is rough.
- Best shape for coarse aggregates is angular for optimal performance.
Concrete Characteristics Influenced by Aggregates
- Aggregates significantly affect concrete workability, strength, void content, bond area, and durability.
Grading and Mechanical Properties of Aggregates
- Desired grain size distribution for good concrete mix is well-graded.
- Mechanical properties of aggregates include bond, strength, toughness, and durability.
Compounds and Additives in Cement
- Gypsum prevents flash setting in cement, facilitating smoother application and hydration control.
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