(3) (405) 7

(3)

Calcium Silicates Part 3. Microscopic Observation of Hydration Processes

By Seiji Kondo and Toshiyoshi YamauchiAbstract

The processes which take place in the hydration of pure calcium silicates when they are

gauged with 1, 3, 6 and 9 times of water have thoroughly been traced up to three months under a microscope. The samples of the silicates were prepared at following temperatures

as reported in Part 1: 3CaOSiO2 1700C, and 1800, 2CaOSiO2 1700, 3CaO2SiO2 1450

and 1475, and CaOSiO2 1500.

(1) The hydration of 3CaOSiO2 and 2CaOSiO2 has occurred quicker than that hitherto

reported by others. 3CaOSiO2 begn to hydrate in about 4 hours. produced crystals of Ca(OH)2

in columns and hexagonal plates in 4 to 5 hours, and began to form silicic acid gel in

droplets after 40 hours. 2CaOSiO2 hydrated after about 40 hours producing silicic acid gel;

However no crystals of Ca(OH)2 were found.

(2) No difference has been observed between the action of water and that of lime water used in gauging.

(3) Any decrease in the amount of water has encouraged the formation of crystal nuclei and increased number of the crystals as well as quantity of the gel.

(4) No change has been observable with the preparations of 3CaO2SiO2 and CaOSiO2

within three months.

Michaelis (1899), Le Chatelier (1904) ,

8 (406)

Klein & Phillips (1914), Bates & Klein (1917), Thorvaldson & Vigfusson, Kuebl & Klasse (1928)

(2)

Cabolet (1908), Kuehl & Wang Tao (1932)

(1934) (19311933)

2

1 3CaOSiO217001800, 2CaOSiO21700,

3CaO2SiO214501475, CaOSiO21500

1, 3, 69 ,

Keisermann

, ,

Grueber

, (40, 212,

7) , , ,

10hr510min, 312hr, 75hr, 11 3

69 10

20 25 20

3

(a) 3CaOSiO2

4hr 45hr

(1:1, 3:1) 45hr, (6:1, 9:1) 6hr

(1)

,

,

D=1.575, D=1.551 ()

Ca(OH)2

(23), 40hr

(45)

2 3

(68),

(3) (407) 9

3 , 6

623 5CaO3Al2O3

,

7 , 20Ca(OH)212

Ca(OH)2

3 Ca(OH)2

3 20 (

9)

Ca(OH)2 (10)

3:1 (40, 222)

(b) 2CaOSiO2

40hr 40hr (1:1, ) 1 Ca(OH)2

14 ,

5

6 1:1, 3:1 12 Ca(OH)2

(, )

7 3 (11)

, 6

Ca(OH)2

(c) 3CaO2SiO2 (d) CaOSiO2

3

4

1 3CaOSiO2 , 45hrCa(OH)2 , 40hr

7

2CaOSiO240hr 7 , Ca(OH)2

2 , 3CaOSiO2Ca(OH)2

2CaOSiO26Ca(OH)2

3 ,

10 (408)

5

1 1 3CaOSiO2 (17001800), 2CaOSiO2 (1700),

3CaO2SiO2 (14501475) CaOSiO2 (1500) 1, 3, 69 ,

3

2 3CaOSiO22CaOSiO2 , 4hr 4

5hrCa(OH)2 40hr 2GaOSiO2

40hr , Ca(OH)2

3

4

( 92 )

3 CaOSiO2 (1-10)

1

* (3:1) (5)150

2

(3:1) (30)150

*

(3) (409) 11

3

(6:1) (30)150

4

(3:1) (2)150

5

(6:1) (2)150

6

(3:1) (3)150

12 (410)

7

(6:1) (3)150

8

(9:1) (3)150

9

(3:1) (3)150

10

(9:1) (3)150

(411) 13

2CaOSiO2

11

(3:1) (3) 150