5 (Admixtures)

5 (Admixtures)1. 53101102262. 53101100483. 5310110267 ( Admixtures )

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: http://www.cpacacademy.com/index.php?tpid=0141

: http://www.cpacacademy.com/index.php?tpid=01411. Air-Entraining Agent (ASTM C 260)

2. Chemical Admixture (ASTM C 494)

3. Mineral Admixture (ASTM C 618)

4. 3

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( Air-Entraining Agent ) 60

(Entrained air) 0.05 . ( Cold storage) ( Air-Entraining Agent ) () 3 - 6% 3 - 4% 1% w/c ratio ( Air-Entraining Agent ) () ( Surface Active Agent ) ( Air-Entraining Agent ) () 5 20 50 20 30

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2.- - 3. -

Chemical Admixture ( ASTM C 494)Chemical Admixture ( ASTM C 494) 7 1. Type A Water Reducing Admixtures2. Type B Retarding Admixtures3. Type C Accelerating Admixtures 4. Type D Water-Reducing and Retarding Admixtures 5. Type E Water Reducing and Accelerating Admixtures 6. Type F High Range Water Reducing Admixtures7. Type G High Range Water Reducing and Retarding Admixtures

1. Type A Water Reducing Admixtures Chemical Admixture ( ASTM C 494) 3 1. w/c ratio2. 3. - Hydration

Type A Water Reducing Admixtures 5% - 15% 10% - 20% Lignosulphonic (LSN) Hydroxylated carboxylic acid (HCA) Type A Water Reducing Admixtures (plasticizer) 3 1. Lignosulphonate 2. Hydroxycarboxylic Acid 3. Polymer Hydroxycarboxylic Lignosulphonic

(plasticizer) 5 7 ? 3 1. Hydration2. 3. 28% 1% 0.28 0.01 0.35 1. 2. 3. 4. 5.

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Hydration 1. 2. 3. 4. 2. Type B Retarding Admixtures ( )

2. Type B Retarding Admixtures ( ) B ASTM C494 4 1. 2. 3. Hydroxycaboxylic Acid 4. Lignosulphoic Acid Hydration 1.2.3. Hydration

3. Type C Accelerating Admixtures ( ) 3. Type C Accelerating Admixtures ( ) () 3. Type C Accelerating Admixtures ( ) () .. 3. Type C Accelerating Admixtures ( ) () ( Set Accelerating Admixture ) 2 3 Shotcrete (Accelerators) Calcium Chloride Calcium Formate Calcium Nitrate 2

(Accelerators) ( Catalyst ) (Accelerators) Hydration LSN HCA

Hydration 4.Type D Water-Reducing and Retarding Admixtures5.Type E Water Reducing and Accelerating Admixtures

~ 15% - 30% ~ 20% - 40% (30 - 60 )

Type F Hydration naphthalene sulphonate

6.Type F High Range Water Reducing Admixtures7.Type G High Range Water Reducing and Retarding Admixtures (Mineral Admixture) ASTM C 618 1.

2. Pozzolana Pozzolana Calcium Silicate-Hydrate Pozzolana 28

: http://www.thaicivil.tht.in/pagetemplateHTM24.html (Waterproofing) (Pumping Aids) (Grouting Material) (Alkali Aggregate Reducing) (Corrosion Inhibitor) (Gas Formers) (Bonding Agents)

- (Waterproofing) -

- (Alkali Aggregate Reducing) Calcium Sulpho-Aluminate - (Corrosion Inhibitor) - (Bonding Agents) Polymer Latex

()- (Grouting Material) Stabilize Bonding - (Pumping Aids)

() 1. . 733-2530 PH

2. 3. 4.

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