Lec 2

Question 1

Pozzolana

Answer 1

The volcanic tuff : finely crushed burnt brick has the same effect
The pantheon dome

Question 2

Hydraulic limes history

Answer 2

14th century: high-quality mortar
18th : the nature of cementing materials
1756 : the best limestone for use in mortar with high proportion of clayey material is found

Question 3

Portland cement development

Answer 3

1796 : patent on hydraulic cement (james parker)
1824 : patent on Portland cement (joseph aspdin)
1900 : basic s were standardized

Question 4

Limestone (from Portland) + …….. —— …. Released —— ….

Answer 4

Finely divided clay, CO2, cement

Question 5

Cement material

Answer 5

Limestone + clay + gypsum

Question 6

Process of cement making

Answer 6

Raw material mining -> raw material grinding -> clinker burner -> cement grinding

Question 7

Lec 2 page 12

Answer 7

Vertical well of raw material transportation
Hualien quarry

Question 8

Lec 12 page 13-15

Answer 8

Vertical well of raw material transportation until crushed raw materials

Question 9

Vertical well and tunnel system

Answer 9

Underground transportation to minimize heavy pollution environmental impact

Question 10

Raw material

Answer 10

Properly blending materials and finely grind to powder

Question 11

https://ibb.co/X5hn91T

Answer 11

Dehydration zone, calcination zone, clinkering zone, cooling zone, clay decompose, limestone decompose, initial formation of C2S, formation of C3S

Question 12

Page 23

Answer 12

Gambar clinker

Question 13

Fineness (m^2/kg)

Answer 13

The last step of cement (grinding of clinker and gypsum). It has wffect on the later hydration process.

Question 14

The higher the fineness

Answer 14

The higher the hydration
The lower amount of bleeding (water required for better)
The lower concrete durability
The higher rate of heat evolution
The higher amount of gypsum for proper set control

Question 15

Normal Portland cement size
Finely-ground cements size

Answer 15

45 niu meter (no 325 sieve) average: 15 niu meter
Less than 10 niu meter, 50% less than 5 niu meter

Question 16

Advantages of the down-step mining method

Answer 16

1. Reduce landscape impact: reduce visual exposure on ground
2. Giving the functions of soil and water conservation and flood prevention:
   When rainstorms occur, rainwater can be collected and stored to prevent rainwater from washing down directly and slow down rainwater erosion.

Question 17

Page 36-38

Answer 17

About mining area near taroko

Question 18

Recessed mining in down-step mining

Answer 18

Keep the outer green belt temporarily untrimmed, gradually reduce mining with the inner stage.

Question 19

Mining simulation

Answer 19

Set up final drainage facilities according to the mine water conservation plan
Final: 22 hectares of flat will be finally set aside for secondary land use (like greening).