EVONIK Air Void Agents Launch of SITREN AirVoid 8.11.2011 Scheuermann / Reinschmidt
Next Generation of Powder Antifoams - Sitren AirVoid 353 Sitren AirVoid 354 Ralph Scheuermann Anke Reinschmidt October 2011
The Influence of Air The preparation of mortar and concrete always requires mixing. These shear forces naturally lead to dispersion of air. The presence of air in cementitious systems is inevitable Small air voids are desirable (easy flow, isolation, uptake of stress) Too much air or large air voids are unwanted (loss of strength, surface defects) Air voids homogenously distributed Use defoamers to control amount of air Air voids inhomogenously distributed Next Generation of Powder Antifoams Page 3
Evolution of Evonik s Defoamers First generation of antifoams from Evonik: TEGO AF P 205 for mortar and all other cementitious systems TEGO AF P 210 designed especially for selfleveling underlayments (SLUs) Second generation of antifoams was developed to: increase performance improve cost efficiency achieve additional benefits SITREN AirVoid 353 and SITREN AirVoid 354 Next Generation of Powder Antifoams Page 4
Test Formulation for stiff Mortar Systems Dosage [g] Raw material Supplier 900 OPC CEM I 42.5 R Milke Cement 2700 Silica sand (acc. EN 196-1) e.g. Normensand, Beckum 9 PCE superplasticizer MC Bauchemie 9 SITREN AirVoid 353 or market product Evonik Industries Water demand: 25 % on total dry mix 1. Add all dry components to the Hobart mixer 2. Mix for two minutes at level 1 3. Slowly add water (and liquid components) 4. Keep mixing for one more minute 5. Change level at Hobart to 2 and mix for two additional minutes to entrain air Next Generation of Powder Antifoams Page 5
SITREN AirVoid 353 outperforms existing Antifoams Flow and air content according DIN 18555-2 Air Flow 12 10 8 6 4 2 0 250 200 150 100 50 0 Air [%] Flow [mm] Pressure gauge method Blank Market Product A Market Product B SITREN AirVoid 351 SITREN AirVoid 352 SITREN AirVoid 353 Flow table Next Generation of Powder Antifoams Page 6
Guide Formulation Self Leveling Underlayment Dosage [%] Raw material Supplier 18.50 OPC CEM I 42.5 R Phoenix 11.50 High alumina cement Kerneos 6.50 Calcium sulfate hemihydrate Knauf 40.67 Silica sand < 2.0 mm Schlenkhoff 19.40 Grained limestone (0.04 0.08 µm) Fels Werke GmbH 2.00 Vinnapas 5023 L Wacker Polymers 0.10 Lithium carbonate (accelerator) Fluka 0.17 Citric acid (retarder) Fluka 0.15 SITREN AirVoid 354 Evonik Industries 0.65 SITREN PSR 100 Evonik Industries 0.25 Melflux 2651 F (plasticizer) BASF 0.11 100.00 Starvis 3003 F (stabilizer) BASF water demand: 21.4 % Next Generation of Powder Antifoams Page 7
SITREN AirVoid 354: The Three-In- One Solution for SLU Formulations Flow and air content according DIN 18555-2 SITREN AirVoid 354: Air [%] 8 7 6 5 4 3 2 1 0 Blank Air Flow after 60 s Flow after 90 s Market Product A Market Product B Market Product C SITREN AirVoid 352 SITREN AirVoid 354 150 145 140 135 130 125 120 Flow [mm] Reduces the air content by 30 %* Pronounced plasticizing effect allows reduction of superplasticizer Highly suitable for fast-setting mortars *depending on the formula Next Generation of Powder Antifoams Page 8
SITREN AirVoid 353 and 354 to be blended for optimum Performance Blending SITREN AirVoid 353 and 354 at various ratios Air Flow after 60 s Flow after 90 s SITREN AirVoid 353 / 354 blends*: Air [% ] 18 16 14 12 10 8 6 4 2 0 140 138 136 134 132 130 128 126 124 Flow [m m ] Efficiently reduce air content Pronounced plasticizing effect Provide smooth and defect-free surfaces Blank Sitren AirVoid 353 9,5 : 0,5 9 : 1 8,5 : 1,5 8 : 2 7 : 3 5 : 5 Poor surface (many pinholes) Average surface (some pinholes) Excellent surface (no pinholes) *depending on the formula Next Generation of Powder Antifoams Page 9
SITREN AirVoid 354 creates smooth Surfaces High surface hardness No pinholes or fisheyes Blank SITREN AirVoid 354 1 cm Next Generation of Powder Antifoams Page 10
SITREN AirVoid 354 has no impact on initial set time Vicat measurement acc. EN 196-3 Depth [mm] 45 40 35 30 25 20 15 10 5 0 60 120 180 240 300 Time [min] Blank Sitren AirVoid 354 Vicat Needle Apparatus ToniSET Expert (picture from Toni Technik Baustoffprüfsysteme GmbH) Next Generation of Powder Antifoams Page 11
SITREN AirVoid 353 and 354 to be recommended in various Applications SITREN AirVoid 353 Tile adhesives Tile grout mortars Repair mortars EIFS (exterior insulation and finishing system) Joint mortars Powder paints Gypsum based applications Waterproofing membranes Stucco / Renders SITREN AirVoid 354 Self leveling underlayment (SLU) Floor screed Flowable grout Next Generation of Powder Antifoams Page 12
SITREN AirVoid 353 at a Glance Appearance Tap density Moisture content (Karl Fischer) Chemistry Recommended dosage Registration status Storage stability Packaging Grey powder 700 1000 g/l < 4 % Polyethersiloxanes on inorganic carrier 0.1 % 0.3 % on total weight EINECS, TSCA, DSL, ENCS, AICS, ECL, PICCS, China, NZIOC Min. 12 months Pallet à 200 kg (10 x 20 kg paper bags) Next Generation of Powder Antifoams Page 13
SITREN AirVoid 354 at a Glance Appearance Tap density Moisture content (Karl Fischer) Chemistry Recommended dosage Registration status Storage stability Packaging Grey powder 700 1000 g/l < 4 % Polyethersiloxanes and surfactants on inorganic carrier 0.1 % 0.3 % on total weight EINECS, TSCA, DSL, ENCS, AICS, China, NZIOC Min. 12 months Pallet à 200 kg (10 x 20 kg paper bags) Next Generation of Powder Antifoams Page 14
New Powder Antifoams Results in a Nutshell Benefits of SITREN AirVoid 353: Reduction of air Sustain desired flow Benefits of SITREN AirVoid 354: Reduction of air Plasticizing effect (reduction of plasticizer) Smooth surface SITREN AirVoid 353 and Sitren AirVoid 354 can be blended at any ratio! Ideal performance can be adjusted depending on raw materials! Next Generation of Powder Antifoams Page 15