Aggregates Flashcards
1
Q
nominal maximum agg size
A
immediate smaller than the smallest sieve which all agg passed
2
Q
Agg grading characteristics
A
; maximum agg size
; packing efficiency: how dense the agg will be
3
Q
Fuller Eqn
A
; max density
; minimize voids
4
Q
Fuller curve
A
; max density
; minimize voids
5
Q
round agg
A
+ easy to compact, packing efficiency good
+ lower interlocking work ability
6
Q
smooth agg
A
+ lower inter particle friction, workability
- lower strength and lower bond to cement
7
Q
air dry
A
; porosity is partially filled
8
Q
SSD
A
; saturated surface dry
; pores filled with water
9
Q
Absorption Capacity
A
From oven dry to SSD
10
Q
Absorption Capacity
A
From oven dry to SSD
11
Q
Effective Absorption
A
From air dry to SSD
12
Q
Moisture content
A
= Absorption Capacity - Effective Absorption
13
Q
porosity
A
; generally low porosity is desirable
14
Q
As porosity increase
A
- strength decreases
- permeability increases
- durability decreases
- abrasion resistance decreases
15
Q
Organic impurities
A
- delay setting time and reduce strength
