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·Pre drying a first uses the fly ash by mixing it immediately with the dissolved NaOH solution for 90 s to take paste form adding 30 s of rest and then adding Na 2 SiO 3 by stirring for another 90 s method b uses the fly ash while the NaOH and Na 2 SiO 3 solutions are put together in a bowl mixing them together for 90 s
·With the increase in the percentage replacement of fly ash and slag in concrete its carbonation resistance decreased due to lack of CH resulting from pozzolanic reaction In this study cement was replaced by fly ash at 20% and 35% levels and by slag at 20% 65% and 90% levels The 35% fly ash and 90% slag replacement level resulted in
·Fly ash acquired from power stations causes removal challenges and environmental concerns Disposal concerns can be solved by employing these waste materials as a raw source to improve soil stability
·The lower the fly ash proportion the better the performance of the cementitious material in terms of quantity and connection generated by the hydration reaction Specimen X12 has the largest proportion of large particle size gangue and it is evident that its micro pores and structural defects such as micro cracks are significantly inferior
·The optimal ratio scheme of large content fly ash slurry is as follows the proportions of fly ash ordinary Portland cement loess accelerating agent expansion agent bentonite water reducing
·Bentonite was mixed in the fly ash in a proportion of 0 2 4 6 8 10 and 12% by weight to investigate the effect of Bentonite content on geotechnical properties of fly ash A small percentage
·Fly ash content had an inverse relationship with compressive strength Superplasticizer was found to improve the flowability and strength of CGBM Multi objective optimization determined the optimal proportion of CGBM to be 80% fly ash content 54% water cement ratio 79% mass concentration and 3% superplasticizer dosage The research
The mixing proportion of 50% fly ash to 50% clay produced a brick with the desired properties high compressive strength 12 MPa low water absorption % and low thermal conductivity
·To explore the mechanism of the microstructural change in salinized soil under freeze thaw cycles and the strength characteristics of subgrade salinized soil improved by fly ash an unconfined compressive test a triaxial shear test and a scanning electron microscopy test were carried out using salinized soil samples with different fly ash contents along the Suihua to
·The effect of mix proportion of geopolymer concrete on compressive strength has been studied in detail in many previous studies but there is a lack of a proposed mix design method Fly ash from different sources will have different extents of geopolymerization with alkaline activators The differences in fly ash characteristics are in the
·Using coal gangue and fly ash as cemented paste backfill materials is a viable solution to address the aforementioned environmental problems [11] [12] Backfill mining can offer support to the overlying strata limit surface subsidence and promote solid waste utilization thereby enhancing the recovery rate [13] Cemented paste backfill with coarse aggregate CPB
·Semantic Scholar extracted view of "The mechanism of limited inhibition by fly ash on expansion due to alkali silica reaction at the pessimum proportion" by Y Kawabata et al Skip to search form Skip to main content Skip to account menu Semantic Scholar s Logo Search 219 913 989 papers from all fields of science
·First complete the design of the proportion of cement fly ash aeolian sand and gravel was completed by orthogonal testing Second based on mechanical property tests compressive strength and splitting strength of each mix proportion were investigated at the maintenance ages of 7 d and 28 d The resistance to sulfate erosion and water
·Fly ash is a by product produced by coal fired thermal power plants and it can as an SCM to replace the cement due to potential The steel fibers content was fixed at 2% by volume The different proportions of HFA/LFA incorporated in cement were 0 20 30 40 50 and 60 wt% and named Ref HFA20/LFA20 HFA30/LFA30 HFA40/LFA40 HFA50/LFA50
· Solution to fly ash ratio The strength of the solution Na2SiO3 NaOH to fly ash ratio rises More than a solution to fly ash proportion of however the rate of strength gain is insignificant Similarly as the ratios increased the mix became more viscous and the unit cost increased as well
·To promote the application of green geopolymer materials the effects and mechanism of commercial superplasticizers on the fresh properties of one part geopolymers prepared from fly ash FA slag powder Slag and anhydrous sodium silicate powder were studied including flowability rheological properties and particles packing properties
·Table 2 presents the mix proportions of MKPC pastes Accordingly two different substitution levels of MKPC with fly ash or metakaolin were used namely 30 wt% and 50 wt% A water to binder ratio of was used Fly ash and metakaolin have both physical and chemical effects on the reaction of MKPC system From the physical effect
·Fly ash is the supplementary cementitious material most widely used ton for ton Taking OPC and alkali activated fly ash AAFA as the two extremes on a spectrum blended cements containing fly ash pozzolanic cements would represent the mi ddle ground The ceiling fly ash dry mass content in pozzolanic binders is usually set at 20% to 55% [11]
·The influence of slag fly ash limestone etc on compressive strength of concrete is of interest to engineers worldwide Moreover there is a lack of clarity on the optimum proportion of
·Fly ash FA is the principal industrial waste byproduct from the burning of solid fuels FA is a powdery solid that is constituted mostly of unburned carbon UC metal oxides Si Fe Ca and Al and other inorganic substances Comparison of ASTM C311 strength activity index testing versus testing based on constant volumetric proportions
·Therefore the proportion of the amorphous phase can be calculated by the following equation 1 P a = 1 P r / P r ′ / 1 P r where P r is the actual proportion of the reference sample P r is the proportion of the reference sample calculated by the Rietveld analysis and P a is the proportion of the amorphous phase in the fly ash sample
·The use of Geopolymer Concrete GPC has been promoted by recent research as a sustainable solution [11] Geopolymers are alkali activated aluminosilicate precursors derived from industrial by products or raw materials such as silica fume SF ground granulated blast slag GGBS fly ash FA which can be used as supplementary cementitious materials SCMs
