Cement, concrete & the circular economy, Cement is a fine, soft, powdery-type substance, mainly used to bind sand and aggregates together to make concrete. Cement is a glue, acting as a hydraulic binder, i.e. it hardens when water is added. Everyone knows the word cement, but it is often confusedShree Dugra stone crusher, Portland Pozzolana cement is ordinary Portland cement intimately blended or interground with pozzolanic materials such as fly ash, calcined clay, rice husk ash etc. Portland cement clinker is either interground or intimately blended with specified quantities of gypsum and pozzolanic materials to produce Portland Pozzolana cement.Fly ash, Fly ash can replace either the Portland cement or fine aggregate (in most cases, river sand) as a filler material. High fly ash content mixes contain nearly all fly ash, with a small percentage of Portland cement and enough water to make the mix flowable.(PDF) Influence of crusher dust on the properties of concrete, The main objective of the work is to find out the effectiveness of fly ash and bentonite collectively on the concrete strength. In this work it was proposed that the cement is replaced with (5%, 7 ...Changing the Environment An Alternative Green Concrete Produced without Portland Cement, A material that resembles Portland cement both chemically and physically is fly ash, which is a byproduct of the combustion of coal to generate electricity at coal -fired power plants. Nationwide, 71 million tons of this material are produced annually..