Builderz Focus

  CHEMICAL ADMIXTURES IN CONCRETE   A material other than water, aggregates, or cement that is used as an ingredient of concrete or mortar to control setting and early hardening, workability, or to provide additional cementing properties. Mostly of people are having some contradiction on considering additives as admixtures although both alter some properties, but they are put on different substances since additives are put during cement production while admixtures are put during concrete mixing. Reasons for using admixtures To suitable concrete of certain properties for complex structures. For economic purposes For maintaining quality of concrete during all stages of concrete work Admixtures can be divided into two categories as follows Mineral admixtures Chemical admixtures In this post will talk more about chemical admixtures as used in modifying properties of fresh and hardened concrete. Chemical admixtures these are water soluble compounds that are added to conc

  PRINCPLE PROPERTIES OF FLUIDS         Fluids is the substance that deform continuously under shearing force, also these are substances    that can flow include liquid and gas. Fluid mechanics is the study which deals with fluids, their properties and forces on them. Fluids have three major properties which are Density Viscosity Surface tension These are very important properties to be discussed so as to know how fluids behave in different situations. Density This is the quantity of substance present in it per unit volume, density of substances can be expressed in different ways as follows                  1.  Mass density This is the mass of the substance per unit volume; mass density is expressed in kilogram per cubic meter as kg/m3.         2.   Unit weight of specific weight                                   This is quantity of substance in Newton per unit volume; unit weight is expressed                                       in Newton per cubic meter.