Ternary Systems Case Study

Better Essays
Ternary systems MgO-SF-QF
3.4.1. Effect of crushed quartz filler on water reduction
The idea of adding crushed quartz filler to M-S-H binder is derived from a study of Portland cement replacement with quartz filler to improve the rheology [25] due to the less water absorption and smooth texture of finely ground quartz particles.
Fig. 9, 10 described water reduction effect of adding crushed quartz filler to maintain a fixed flow of MgO-SF-QF ternary systems (Series 3, 4, 5). The replacement of cementitous materials by crushed quartz filler improves rheology considerably, expressed by the consistent reduction of water content while maintaining a minimum flow of 120-125 mm for workability. The amount of reduced water is proportional to the increase
…show more content…
13 shows dependence of compressive strength on water content of ternary systems. As w/s decreases, total water content in the mix decreases and results in increased strength, except two mixes in series 4 (S4.30 and S4.40). These two mixes include very high filler content at 30-40% in which the decrease of water content might not compensate the strength loss due to the reduction of cementitious materials (MgO + SF). From this figure, the effective range of w/s to achieve the highest strength is found in each series. To achieve the optimal compressive strength of over 80 MPa, the mortar mixtures required low SF content (MgO/SiO2 = 60/40) in combination with low water content of w/s = 0.21-0.27 (equivalent to w/cm = 0.30-0.35 (Table …show more content…
High SF content binder might contain unreacted silica fume particles in low water content mixtures, results in poor particle packing and reduces strength. As testing both binary and ternary systems, the optimal binder composition for strength was observed with mixture of 60/40 MgO/SF ratio instead of 40/60 MgO/SF ratio as required by stoichiometry for chemical reactions to form M-S-H gel. The optimal binder composition, therefore, is dependent not only on the MgO/SiO2 ratio for maximum formation of M-S-H gel, but also the MgO/SiO2 ratio for maximum packing density characterized by particle size and shape of each constituent in the binder. By adding crushed quartz filler from 10-40% binder, the compressive strength and workability improves considerably. Compressive strengths of Q20 and Q30 samples indicate the effective crushed quartz filler content of between

Related Documents

  • Decent Essays

    3.4. Ternary systems MgO-SF-QF (MgO-SiO2-Quartz fillers) 3.4.1. Effect of crushed quartz filler on water reduction The idea of adding crushed quartz filler to M-S-H binder is inherited from replacement of Portland cement with quartz filler to improve the rheology of cement paste [25] due to the less water absorption and smooth texture of finely ground quartz particles. Fig. 9 described water reduction effect as adding crushed quartz filler (QF) to MgO-SiO2 binary system to maintain a fixed flow of MgO-SF-QF ternary system (Series 3, 4, 5).…

    • 1558 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    Copper Gta Welding

    • 1640 Words
    • 7 Pages

    The increase in ductility is related to the microstructure of the welds at a temperature below 1058 °C. In this temperature range, the amount of liquids among the α-Cu grains is minute, and the composition of the liquids resembles the eutectic of (Cu+Cu2O). Solidification of Cu+Cu2O eutectics at the tip of cracking hinders the propagation of crack between adjacent α-Cu grains, and in some degree leads to the increase of strength. Thus, the strength of the welds increases from 10.3 Mpa at 1058 °C to 12.2 Mpa at 1053 °C. At 1020 °C, which is close to the lower limit of the welds’ S-L range, the ductility of the welds increases to 0.00493, which is very close to the Δε (0.00508) during welding.…

    • 1640 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    Conclusions This study reports the partial replacement of MK by non-calcined WTS in the production of geopolymer with sodium silicate from RHA. The results showed that the properties of geopolymers binders are highly dependent on the WTS content in the mixture. The binder with WTS increased the setting times, kinetics of temperature test showed low rates of geopolymerization reactions. The workability and the mechanical properties of the geopolymer mortars decreased as the WTS content in the binder increased. The compressive strengths in all curing ages were higher than the minimum required for several types of building components.…

    • 759 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    Metakaolin Case Study

    • 2230 Words
    • 9 Pages

    The incorporation of both Metakaolin and Silica fume in concrete was found to reduce the free drying shrinkage and restrained shrinkage cracking width. It is also reported that the incorporation of Metakaolin or Silica fume in concrete can reduce the chloride diffusion rate significantly. The performance of Silica fume was found to be better…

    • 2230 Words
    • 9 Pages
    Decent Essays
  • Decent Essays

    It is because more acid adds to the milk; it will decrease the pH of casein more, and less neutral casein will precipitate as more casein will precipitate and dissolve again. [1] [2] For 25% acetic acid, least casein will be precipitated, as the concentration of pH is highest, the pH of milk will be lower than pH 4.6 from pH 6.6. It is because more acid adds to the milk; it will decrease the pH of casein more, and less neutral casein will precipitate as most of the casein will precipitate and dissolve again. [1]…

    • 1545 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    The Thin layer chromatography plate shown in Figure 3 is used to identify compounds as well as determine their purity [9]. The crude product spot moved the same distance as the 2-NBB spot. The 4-NBB spot did not appear on the plate, indicating a low concentration of the substance. 4-NBB should diffuse farther up the TLC plate than 2-NBB due to the difference in polarity.…

    • 1570 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    2.1. C. tomentosum extract characterization C. tomentosum extract proximal composition is shown in Table 1. The relatively higher ash proportion in seaweed extract (SE) (aprox. 74%) could largely be accounted for by the lower moisture content, and probably due to a hygroscopic nature of the SE (Blanco-Pascual, Montero, & Gómez-Guillén, 2014). The values of TPC and DPPH radical-scavenging activity are consistent with literature (Andrade et al., 2013; Valentão et al., 2010) (Table 1).…

    • 1376 Words
    • 6 Pages
    Decent Essays
  • Decent Essays

    In case of no filler materials it has low matrix continuity between matrix and fibre with low capacity of absorption, which results in micro crack initiation which leads to failure so value was less, Then material D with 2% silicon carbide and activated charcoal shows 0.110 Kgm because silicon carbide has high hardness and excellent thermal shock resistance, but activated charcoal reacted with that lead to decrease its impact strength and its value is less than material E. The Test results shows that by adding mica to the material we can get better impact strength. From this we came to a conclusion that we should not add silicon carbide and activated charcoal. By adding mica to the material we can increase the impact…

    • 1024 Words
    • 5 Pages
    Decent Essays
  • Decent Essays

    These organic acids include oxalic acids, maleic acids, muconic acids and so on[18, 20, 21]. Because of the selective nature of ozone with regard to formed by-products, whereby acidic conditions produce a low TOC removal rate, direct ozonation rarely yields complete mineralization. [22]. Alternatively, strong alkaline conditions provide an important improvement in the oxidation power of ozonation process, which can be attributed to the prevalent indirect process that incorporates the production of OH radicals by ozone decomposition in aqueous solution, especially that which is catalyzed by OH− (i.e. higher pH) shown below in the following…

    • 860 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    The slump decreased as the Sawdust Ash content increased indicating that concrete becomes less workable as the Sawdust Ash content increased. The compressive strength decreased with increasing Sawdust Ash as replacement. The compressive strength of concrete with Sawdust Ash was lower at early stages but improves significantly…

    • 1226 Words
    • 5 Pages
    Decent Essays