·The history of magnesium oxysulfate MOS cement began with a patent granted in 1891 to Enricht for artificial stone or cement MOS cement is an air dried magnesia based material produced by the reaction of magnesium oxide magnesium sulfate and water [1] [2] [3] The system components of MgO MgSO 4 H 2 O are similar to those of magnesium
·A high calcium fly ash FH 23% total CaO 5% free CaO with high SO3 content % was studied as additive in mortar replacing part of the volume either of Portland cement or aggregate
·High calcium fly ash HCFA is a variant of the fly ash HCFA features a high content of Ca 2 and reactive crystalline phases such as lime CaSO 4 calcium aluminates sulphoaluminate and calcium aluminum ferrite [10] [11] This composition allows HCFA with pozzolanic activity as well as hydraulic hardness [8] [12] In cementitious materials HCFA
·Title Simulation of Low Calcium Fly Ash Blended Cement Hydration Author s Xiao Yong Wang Han Seung Lee and Ki Bong Park Publication Materials Journal Volume 106 Issue 2 Appears on pages s 167 175 Keywords cement hydration; fly ash; pozzolanic reaction; simulation DOI /56464 Date 3/1/2009 Abstract Low calcium fly ash FL has been
·The Afşin Elbistan AE thermal power plant in Turkey produces more than 3 million tons per year of a high calcium fly ash that can not be blended with cement due mainly to its high sulfur oxide and free lime contents and low sum of SiO 2 Al 2 O 3 Fe 2 O 3 [12] This greatly limits the use of AE fly ash which represents 15 20% of all the fly ash in the country
·This study presents an investigation into the durability of geopolymer concrete prepared using high calcium fly ash along with alkaline activators when exposed to 2% solution of sulfuric acid and 5% magnesium sulphate for up to 45 days The durability was also assessed by measuring water absorption and sorptivity
·Geopolymer is synthesized by mixing material rich in alumina and silica such as fly ash with a highly alkaline solution to form a hardened matrix However when using high calcium fly ash as a precursor a flash set frequently occurs the mixture hardens very rapidly before casting can be completed The use of borax as an additive has been reported due to its
·According to the difference in calcium content fly ash is divided into high calcium fly ash C class FA abbreviated to HFA and low calcium fly ash F class FA abbreviated to LFA during actual engineering practice Du et al 2022 In general HFA possessed higher reactivity than LFA in the hydration process of cement which was widely
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