Considering Portland cement to be $90/ton and gypsum to be $30/ton Kimball and Jewell 2016 a one cubic meter of mixture with the density of gr/cm3 with 8% Portland cement 112 kg or 100% of the total binder content would cost $ while a mixture of 2% gypsum 28 kg or 25% of the total binder content and 6% Portland cement 84
·Lowering the calcination temperature and lengthening the residence duration may help to reduce this effect The reactivity of calcined clay is also determined by the kaolinite content and blending of the calcined materials with clinker and gypsum to form the final cement product Researchers have already identified some ways to optimize
Effect of sodium silicate on Portland cement/calcium aluminate cement/gypsum rich water system strength and microstructure Zhiming Wang ab Yuning Sun ab Shuo Zhang a and Yonglong Wang a a School of Energy Science and Engineering Henan Polytechnic University Jiaozuo 454002 China E mail sunyn639 b State and Local Joint Engineering Laboratory
·The impacts of Ca langbeinite on cement hydration and hardening properties were studied compared with gypsum The effects of alkali sulfates on cement properties would also much depend on other factors associated with cement such as the content of C 3 A and fineness and curing conditions Related research works have been carried out continually
·The result shows that the FGD gypsum by thermal treatment which is mixed into slag cement can improve the cement strength and adjust the setting times effectively without any negative effect
·All groups achieved approximately 80 % hydration within one day testing indicating that gypsum content had minimal effect on C 4 A 3 $ s degree of hydration Q phase The Q phase dissolved quickly Contribution to low carbon cement studies effects of silica fume fly ash sugarcane bagasse ash and acai stone ash incorporation in
·It counteracts the tendency of some cement compounds to cause excessive expansion and cracking promoting dimensional stability in the hardened concrete Effects of Gypsum on Cement Improved Workability Gypsum enhances the flowability and plasticity of cement making it easier to pour mould and shape
·The mix ratio of paste is shown in Table 2 firstly % K 2 Cr 2 O 7 was added into cement clinker and then the ball mill was used to mix evenly; under the condition that the mass fraction of cement mixed with SO 3 3% is unchanged ferrous sulfate replaces gypsum in cement by mass ratio 0% 25% 50% 75% 100%; the water binder ratio of the paste was ;
·However the effect of additional gypsum blending on hydration kinetics of ye elimite containing sufficient calcium sulfate could not be distinguished [12] A reduction in cumulative heat of hydration upon gypsum addition has been reported due to dilution effect [13] In presence of gypsum lower amount of amorphous content is formed
·Sulfate attack is a significant durability concern for cement based materials that threatens many concrete structures Although this is not a new issue in the last couple of decades a myriad of structural members including dams concrete pavement bridge piers concrete piles buried concrete foundations highway or railway tunnels and floor slabs have
·There is an increasing demand to ultra high strength cement based materials in the Middle East despite finding fine aggregates with a normal SO 3 level is a major challenge This study was conducted to investigate the effect of increasing gypsum content of natural river sand on the properties of water and steam cured ultra high strength concretes UHSCs and
·As the curing period increased the addition of cement content led to a proportional increase in UCS strength but 28 day UCS showed very slight variation in strength between 20 % and 25 % or a marginal improvement from times to times initial strength when the cement content was raised from 20 % to 25 %
·Calcium sulfoaluminate cement CSAB is an environmentally friendly alternative to Portland cement PC Chaunsali and Vaishnav 2020; Gartner 2004; Gartner and Sui 2018 The amount of carbon dioxide CO 2 released in the manufacturing of CSAB cement is about 30% lower than that for PC Hanein et al 2018; Zhou et al 2006 The principal clinker
·Semantic Scholar extracted view of "Optimization of the SO3 content of an Algerian Portland cement Study on the effect of various amounts of gypsum on cement properties" by Siline Mohammed et al In this study we examined the effects of cement fineness SO3 content an accelerating agent
·The Portland cement used in this work was P Ⅱ according to Chinese standard GB175 2007 [14] with a Blaine fineness of 320 m 2 /kg and specific gravity of 3110 kg/m F fly ash conforming to ASTM C618 [15] was blended as mineral admixture the Blaine fineness and density of which were 345 m 2 /kg and 2450 kg/m 3 gypsum
·Analytically pure KOH and K 2 SO 4 were added into ground cement clinkers to adjust the alkali content and the amount of gypsum added into the ground cement clinkers was adjusted to maintain a constant SO 3 content of % in the cement The mix proportions of the cement pastes are listed in Table 3 The water/cement ratio of the pastes is
·To mitigate such effect the construction industry developed new formulations of alkali free accelerators which contain sulfate ions in their composition to balance the C 3 A/SO 3 ratio However mixes with these accelerators may still behave as undersulfated [3 6 10] so that extra doses of sulfate are required to control C 3 A and C 4 AF proper addition of
·Gypsum is an indispensable component of ordinary Portland cement The main function of gypsum is to regulate the setting time of cement Gypsum has a great influence on water consumption of standard consistence and strength simultaneously In this article three cementitious systems are prepared by three main mixed materials limestone fly ash and slag
The setting times and early strength of shotcrete are greatly affected by the gypsum content of the cement used In this work the setting times compressive strength and microscopic analysis X ray diffraction quantitative analysis thermogravimetric analysis and scanning electron microscopy were used to determine the effects of changes in gypsum content on the hydration
·Effect of Desulfurization Ash with Different Gypsum Content on Rheology Characteristic Hydration Structure and Rebar Protection of Cement Based Materials Xiaodong Wen1 Yong Yi1 Guosong Li1 and Zhinan Gao2 1Ningbo University of Technology Ningbo Key Laboratory of Concrete structure Durability 315016 China
Semantic Scholar extracted view of "Gypsum in Cement" by G Frigione Semantic Scholar extracted view of "Gypsum in Cement" by G Frigione Effect of sulphate content of cement upon heat evolution and slump loss of concretes containing high range water reducers superplasticizers S M Khalil M Ward
·To better understand both the effect of gypsum on cement hydration and the morphology of the hydration products studies on C3S hydration in the presence of gypsum were incorporated into a mechanistic study of cement hydration As the hydration progresses the gypsum content detectable by DTA decreases until at approximately i0 hours no
·The introduction of the European Union s climate change legislation and the intended use of renewable energy sources instead of fossil fuels will significantly reduce the production of flue gas desulfurization FGD gypsum used as the raw material for gypsum mortar plasters production This has forced mortar producers to look for alternative materials
·To mitigate such effect the construction industry developed new formulations of alkali free accelerators which contain sulfate ions in their composition to balance the C 3 A/SO 3 ratio However mixes with these accelerators may still behave as undersulfated [3 6 10] so that extra doses of sulfate are required to control C 3 A and C 4 AF proper addition of
