PPT-ADMIXTURES FOR CONCRETE

Concrete is essentially made from five materials 1 Air 2 Water 3 Cement 123paste 4 Fine aggregate 1234grout or mortar 5 Course aggregate 12345concrete Definition An admixture is a material added to the batch of concrete before or during its mixing to modify its freshly mixed setting or hardened properties . 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 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. Concrete- composite construction material . Cement Coarse Aggregate Fine Aggregate . . Water Chemical Admixtures. In its simplest form, concrete is a mixture of paste and aggregates. . . The word concrete comes from the Latin word ". 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%). CONCRETE. Prof. . Dr. Özgür EREN. Department of Civil Engineering. Eastern Mediterranean University-Gazimağusa-N.Cyprus. 2017. 1. CHAPTER 1. AN INTRODCUTION TO, AND A CLASSIFICATION OF, CEMENT ADMIXTURES. 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). of . Concrete. . Presented by. Chuck Curry. ABCs of Concrete. What is concrete?. Where does it come from?. How is it used?. Is it all the same?. . www.concrete-pipe.org. www.concrete-pipe.org. Early History . 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 Pipe Concrete of Today A modern wetcast concrete is more than a mixture of cement, aggregate and water ADMIXTURES and Supplementary Cementitious Materials (SCM) are becoming as ESSENTIAL as PORTLAND CEMENT when making modern concrete Concrete for Box Culverts – Wet Cast Concrete Joseph A. Daczko, FACI – BASF Construction Chemicals Presentation Outline Many Performance Demands on a Concrete Mixture Wet Cast Box Culverts Specifications and Production Requirements 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