·The industrial by product gypsum with dihydrate gypsum hemihydrate gypsum or anhydrite as the main phase composition is the key material to catalyse the formation of ettringite crystals which plays an important role in the hydration hardening and strength development of cementitious materials [19]
a type hemihydrate gypsum strength ratio after hardening Home < a type hemihydrate gypsum strength ratio after hardening; Hydration reaction and microstructural characteristics of hemihydrate Calcium sulfate hemihydrate β CaSO 4 · 2 O is the most widely used gypsum building material [16] However the commertial hemihydrate phosphogypsum that
·Calcium sulfate hemihydrate β CaSO 4 · 2 O is the most widely used gypsum building material [16] However the commertial hemihydrate phosphogypsum that is heated at 100 180℃ directly is not as popular as desulfurization gypsum due to its lower performance [3] The commercial hemihydrate phosphogypsum contains impurities such as
·When compared with the PPSS the SPMS had a lower water content and a higher dry density at the same water/gypsum ratios When the water/gypsum ratio was low the SPMS exhibited more
·The strength of calcined gypsum is illustrated in Fig 6 In Fig 6 it reveals a negative correlation between strength variation and composite ratio when the composite dosage is % As the composite ratio increases from 1 10 10 1 samples E1∼E5 2 h flexural strength decreases from MPa to MPa and 2 h compressive strength
·The hydration and hardening of α hemihydrate phosphogypsum HH prepared in the absence and presence of L Aspartic acid L Asp were investigated by thermodynamic analysis measurements of ion concentrations and crystal water content and morphology observation In addition computed tomography CT scanning was proposed to analyze the
·This study combined inorganic α hemihydrate gypsum α HHG with organic polyacrylamide PAM hydrogel to create a novel α HHG/PAM composite material Through this facile composite strategy this fabricated material exhibited a significantly longer initial setting time and higher mechanical strength compared to α HHG The effects of the addition amount and
·An industrially feasible process was proposed to produce α calcium sulfate hemihydrate α HH from FGD gypsum without any additives In this process an AlCl3 solution was used to promote the conversion of calcium sulfate dihydrate DH to hexagonal prismatic α HH with high strength at atmospheric pressure The phase transition kinetics of FGD gypsum
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