Construction Chemicals for Concrete

Transcription

1 Construction Chemicals for Concrete Evonik s Additive Management Systems for Concrete / PCS Construction 1

2 Our expertise Interfacial phenomena within the construction industry Our five management systems address the specific requirements of the construction industry, such as: Performance Durability Lifecycle management Appearance Resource efficiency Cost efficiency Eco-friendliness Our brands: SITREN SITREN AirVoid TEGO Antifoam 2 TEGOSIVIN

3 1. AirVoid Management Control air with our defoamers and air entrainers The production of concrete requires intensive mixing with water. The shear forces introduced during mixing, in combination with surface-active components in the concrete formulation, result in the distribution and stabilization of uncontrolled air in fresh concrete. Defoamers are used for the prevention and removal of this undesired air. Air entrainers, in contrast, are used to introduce controlled air voids for specific concrete applications and performance requirements. Thanks to our in-depth knowledge in the field of interfacial technology, we can influence the interplay between air entrainers and defoamers in a targeted way when both additive technologies are used in combination. Air in concrete has a direct impact on: Workability Mechanical properties Durability Aesthetics Slump properties Density Defoaming Air void size control Air entrainment Air stabilization Air void distribution 3

4 1. AirVoid Management Optimum quality with our air entrainment additives Air entrainers are required to create stable and homogeneously distributed air voids. Depending on the requirements, air stabilizing additives can optimize the size, content and distribution of the air voids. SITREN AirVoid 601 is based on synthetically produced surfactant technology and is characterized by a strong, predictable relationship between dosage and quantity of entrained air. SITREN AirVoid 601 serves as a highly efficient air entrainer in concrete; delivering improved workability, durability and cost savings. AIR ENTRAINER AIR ENTRAINERS AT A GLANCE Product Dosage* Applications Foaming capacity Product Properties Air Stabilization Workability SITREN AirVoid % Air entrained concrete, freeze / thaw resistance etc XXX XXX XXX * Referred to binder material X = suitable XX = recommended XXX = highly recommended 4

5 1. AirVoid Management Optimum quality with our defoamer additives Our AirVoid defoamers reduce concrete air content resulting in higher flexural, tensile and compressive strengths and improved abrasion resistance. The selection of the correct defoamer chemistry ensures that neither cement hydration nor the concrete s early strength are adversely affected. Our new liquid defoamer additives portfolio offers an extensive range of surfactant chemistries and combines the expertise and the chemical know-how of two well established partners* in the concrete industry. DEFOAMERS AT A GLANCE DEFOAMER Product Chemistry Dosage by weight of superplasticizer Recommended Application* Product Properties Defoaming strength Defoamer compatibility SITREN AirVoid 305 Polyether % Ligno / Ligno- PCE blends XXXXX xx SITREN AirVoid 307 Organomodified % Ligno / Lignosiloxane emulsion PCE blends XX XX SITREN AirVoid 312 Polyether % PCE / Ligno XXX XXXX SITREN AirVoid 320 Acetylenic % PCE XXX XXXX SITREN AirVoid 321 Acetylenic % PCE XXX XXXX SITREN AirVoid 325 Acetylenic % PCE / Ligno XXXXX xx *Advice for SNF and SMF available upon request. X = suitable XXX = recommended XXXXX = highly recommended 5 * Evonik and Air Products Specialty Additives. Further grades available on request

6 2. Protection Management - No room for water / moisture with our water repellents Water repellents are used to provide concrete with durable protection against water and moisture. Our TEGOSIVIN CA / HE water repellents are designed to minimize the infiltration of water and dissolved pollutants without compromising water vapor permeability. TEGOSIVIN water repellents also contribute to the reduction of primary and secondary efflorescence. WATER REPELLENTS Product Chemistry Dosage* Tegosivin CA 880 Tegosivin HE 328 Emulsion of alkoxy-functional silanes Emulsion of organomodified siloxanes/silanes Product Properties Water Repellency Efflorescence Control % xx x % xxx xx *Referred to cement x: suitable xx: recommended xxx: highly recommended > 90 Wetting angle of a water droplet on a hydrophobic surface 6

7 3. Curing Management - Ensuring stability with our shrinkage reducing agents Shrinkage reducing agents are used to limit the crack formation and deformation of concrete. Our new SITREN SRA products are liquid shrinkage reducing agents based on a novel technology. In addition to their environmental friendly, low VOC characteristics, they have no significant impact on concrete setting and compressive strength. SITREN SRA L 210 is the first of our new liquid product line and significantly reduces both plastic and drying shrinkage at an attractive price / performance ratio. SHRINKAGE REDUCING AGENT Product Chemistry Dosage* Applications Product Properties Shrinkage Low Emission reduction SITREN SRA L 210 Nonionic surfactant % Standard precast and readymix concrete. Screeds, semi-dry, wetcast and high performance concrete * Referred to cement X = suitable XX = recommended XXX = highly recommended XXX XXX 7 Further SITREN SRA grades will be launched in Q2/2018

8 4. Release Management - Mold release agents The demolding process and the associated use of mold release agents is becoming increasingly important due to the aesthetic demands on concrete structures. Smooth, defect-free and thus visually attractive concrete surfaces are seen today as hallmarks of quality in manufactured building components. SITREN MR 870 and 871 are biodegradable, non-hazardous mold release agents which not only deliver outstanding release performance, they also prevent concrete discoloration, surface residues and corrosion of metal molds. MOULD RELEASE AGENTS RELEASE AGENTS AT A GLANCE Product Properties Product Chemistry Dosage* Release Properties Metal Corrosion Protection Readily Biodegradable SITREN MR 870 vegetable oil emulsion 10 to 18 ml /m² XXX XX XXX SITREN MR 871 vegetable oil emulsion 10 to 18 ml /m² XXX XXX XXX X = suitable XX = recommended XXX = highly recommended 8

9 5) Formulation Management - Innovative, tailor-made, solution oriented products WETTING AGENTS / DISPERSING AGENTS / PROCESS DEFOAMERS AT A GLANCE EVONIK s extensive chemical toolbox Process and performance additives that: Increase efficiency and compatibility of compounding Optimize mixing and processing procedures Improve adhesion properties Increased storage stability 9

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