PPT-Admixtures

Admixtures are material added to concrete mix in order to modify its properties Usually it is not more than 5 by mass of cement and should always follow the manufacturer recommendations Additives. Admixtures should never be regarded as a substitute for good mix design good workmanship or use of good materials 1 uses of admixtures The most common reasons for using admixtures in concrete are To increase workability without changing water conten Chapter 2. Chapter Topics. Portland cements. Supplementary cementitious materials. Blended cements. Aggregates. Maximum size of aggregate. Aggregate grading. Harmful substances in aggregate. Mixing water. Admixtures are introduced through the High and Low Flow Admix Systems. These systems are governed through adjustable valves with visual flow indicators. The accuracy of these flow meters is guarant Chapter 2. Chapter Topics. Portland cements. Supplementary cementitious materials. Blended cements. Aggregates. Maximum size of aggregate. Aggregate grading. Harmful substances in aggregate. Mixing water. 1. EFFECTS OF AIR ENTRAINMENT. Durability. The main usage of air entrainment is to enhance the durability of concrete. . against cycles of climatic freezing and thawing and against the effects of de-icing salts (. 2. What is Concrete?. A mixture of various components which chemically react to form a strong construction material. Unit Weight – normal 2400 kg/m. 3 . or semi 1900 kg/m. 3. Component Ratios:. Cement (10 to 15%). Charles . Nmai. , Ph.D., P.E., FACI. BASF Corporation (Admixture Systems). Beachwood, OH 44122. Code and Standard Specification Provisions for Discharge of Concrete. ASTM C94/C94M. ACI 318-14; ACI 301-10. for. CONCRETE. 1. TYPES OF WATER-REDUCING ADMIXTURES. Normal water-reducing. Accelerating/water-reducing. Retarding/water-reducing. Following functions can be performed with these admixtures:. Increase in workability (slump, compacting factor, VeBe). and Bridge Rehabilitation Program. Anthony Mizumori, . PE, SE. DeWayne Wilson, . PE. Washington State Department of Transportation. Center for Environmentally Sustainable Transportation in Cold Climates. Scott Muzenski. Ismael Flores-Vivian. Konstantin Sobolev. 2014 Alask. a Concrete Summit. November 25, . 2014. Outline. Superhydrophobicity. Surface Hydrophobization. Internal Hydrophobization. Flexible SECC. Admixtures for Concrete Pipe Jason D. Wimberly, PE, MCE GCP Applied Technologies January 16, 2018 Concrete of Today A modern wetcast concrete is more than a mixture of cement, aggregate and water Chemical Admixtures for Concrete Pipe Ver 1.1 Ed Mansky Grace Construction Products Febuary 11, 2014 Concrete Admixtures Learning Objectives Provide an introduction of chemical admixtures for use in concrete ADMIXTURES FOR CONCRETE Concrete is essentially made from five materials. 1. Air 2. Water 3. Cement 1+2+3=paste 4. Fine aggregate 1+2+3+4=grout or mortar 5. Course aggregate 1+2+3+4+5=concrete Concrete materials, mixture proportioning, and control tests Chapter 2 Chapter Topics Portland cements Supplementary cementitious materials Blended cements Aggregates Maximum size of aggregate Aggregate grading