Portland                                    Masonry

500 gr. cement                         480 gr. N, 510 gr. S, 540 M Masonry

1375 gr. graded sand              810 gr. graded sand

242 gr. water                             810 gr. 20-30 sand

                                                   Previous water% x (480 N), (510 S), (540 M)

0:30 mix slow 30 sec

1:00 add sand 30 sec

1:30 mix medium 30 sec

1:45 scrape down bowl 15 sec

3:00 cover and stand 1:15

4:00 mix medium 60 sec

Portland                                                          Masonry

5:00 stand without cover 1:15                      make flow 25 drops 110 ± 5 (trowel)

5:15 scrape down bowl last 15 sec              air determination - cup (straight edge)

5:30 mix medium 15 sec                                 recover

Make cubes                                                   mix medium 15 sec

                                                                        Make cubes

Masonry (N)                                                          Masonry HS (S or M)

420 gr. masonry                                                     450 gr. masonry

720 gr. graded sand

720 gr. 20-30 sand

ml water see previous days % x 420 (about 200)

:30 mix slow 30 sec

1:00 add sand 30 sec

1:30 mix medium 30 sec

1:45 scrape down 15 sec

3:00 cover and stand 1:15

4:00 mix medium 1:00

5:00 make flow 25 drops 110 ± 5

Recover

:15 mix medium 15 sec

Fill dish, tamp 15, smooth w/ straight 1 smooth raised 2 saw motion from center

1:00 apply vacuum 60 sec

Remove droplets

:15 plow and mix 15 sec

Make flow 25 drops 110 ± 5 (trowel)

Calculate: water retention = (flow after/flow before) x 100

1005 gr. graded sand

1005 gr. 20-30 sand

300 ml water

670 gr. masonry

Room humidity > 50% (always)

1:00 add water and sand mix 1:00

1:30 add masonry 30 sec

2:30 mix for 1:00

2:45 scrape bowl 15 sec

5:45 mix add enough water the first 3 min is needed.

6:45 continue mix 1:00

Make flow 15 drops 119 ± 1 (trowel)

Recover

:15 mix medium 15 sec

Make pie

30 min from start make flow 15 drops 119 ± 1

60 min from start make flow 15 drops 119 ± 1

90 min from start make flow 15 drops 119 ± 1

650 gr. cement                                                 500 gr. masonry

ml water see previous days                           ml water see previous days

:30 absorb 30 sec

1:00 mix slow 30 sec

1:15 scrape down 15 sec

2:15 mix medium 1:00

2:45 shape ball, toss 6 times

3:15 test 10mm ± 1 mm after 30 sec

Make autoclave bar

Do time of setting - Vicat

Initial Setting - after 30 min in moist cabinet determine penetration every 15 min until <25 mm pen

Final Setting – when needle doesn’t visible sink

Do time of setting - Gillmore

Initial Setting - when needle doesn’t visible sink (appreciable indentation)

Final Setting – when needle doesn’t visible sink

1400 gr. 20-30 sand

350 gr. cement

ml water see previous days

:30 mix slow 30 sec

1:00 add sand 30 sec

1:30 mix medium 30 sec

1:45 scrape 15 sec

3:00 stand covered 1:15

4:00 mix medium 1:00

5:00 make flow 10 drops 87 ½ ± 7 ½ (straight edge)

6:30 fill 400 ml measure, three equal layers, tamping each 20 times, 5 taps (straight edge) 1:30

500 gr. cement

ml water see previous days

:30 absorb 30 sec

1:00 mix slow 30 sec

1:15 scrape down 15 sec

3:45 mix medium 2 ½ min

Ball, set up on vicat

4:05 release rod on vicat, 32 ± 4 mm (initial)

4:35 let rod settle for 30 sec

8:45 release rod on vicat record reading (final)

If final is > ½ of initial calculate

If final is < ½ of initial

1:00 recover and mix medium for 1:00

Ball, set up on vicat

1:20 release rod on vicat

1:50 let rod settle for 30 sec record remix reading

The Cement Chemists' Society has been serving the Cement Chemists' community since 1997. We specialize in organizing educational seminars in which the Cement Chemist can interact with Expert Consultants, Vendors, and other Cement Chemists.