Overall, the designed strength is achieved with 65% fly ash, requiring 59% less energy, reducing 54% CO 2 footprint, 56% GWP 100, 80% HTP inf, 46% ODP inf, …
Because the high-quality fly ash with smooth surface will be uniformly filled between the cement particles to play the role of dense packing and micro-aggregate, …
To understand the mechanism of fly ash in a novel magnesia phosphate cement (MPC), the microstructure and properties were investigated in the present study. Reference specimens without the incorporation of fly ash were also investigated for comparison purposes. The effect of fly ash content on the properties of MPC was …
Currently, more than 50% of the concrete placed in the U.S. contains fly ash. Dosage rates vary depending on the type of fly ash and its reactivity level. Typically, Class F fly ash is used at dosages of 15% to 25% by mass of cementitious material and Class C fly ash at 15% to 40%.
The blended cement contains about 20 % by mass fly ash substitution for cement. Water loss/gain under various curing conditions is monitored both globally by bulk mass (loss) measurements and ...
The influence of fly ash content on ITZ microstructure of coal gangue concrete ... [26], the fine aggregate is medium sand in Zone II, and its quality meets the specification requirements. The coarse aggregate is crushed stone with a particle size of 5–20 mm. The coal gangue is produced in the Daliuta Coal Mine, Shenmu City, Shaanxi …
In Fig. 11 is clearly shown that, a compressive strength of concrete at 0% fly ash replacement or control mix is greater than 7th and 14th days samples replacing cement by fly ash at different percentage, while 28th age control mix was less than the rest samples replacing cement by fly ash at different percentage with the incorporation of …
The durability of backfills is a crucial factor in maintaining the long-term stability of the mine backfill area. Partial replacement of cement by biomass fly ash (BFA) is a cost-effective and sustainable way for viscosity control of self-consolidating cement-tailings grouts (CTG), however, the unfavorable changes of pore structure may affect the durability during the …
A locally available ing agent was diluted with potable water in a ratio of 1:3 by weight, where after was produced by aerating to a density of 50 kg/m 3.Fifty three grade Ordinary Portland Cement [14], coarse river sand (specific gravity = 2.66), pulverized river sand finer than 300 μm (specific gravity = 2.52) and class F fly ash …
A higher fly ash replacement (20%) in normal (27.6 MPa) and high-strength (41.4 MPa) concrete leads to a greater reduction in damages across all endpoint groups, …
Substituting high volumes of cement with fly ash in concrete can provide high quality concrete and a relief in the environment without compromising the quality of concrete. ... susceptible to the effects of weathering and loss of strength and durability [5]. Fly ash reacts with lime to create more calcium-silicate hydrate (CSH) produced during ...
DOI: 10.1016/0008-8846(93)90045-B Corpus ID: 137541944; Influence of different sized fractions of a fly ash on workability of mortars @article{Mora1993InfluenceOD, title={Influence of different sized fractions of a fly ash on workability of mortars}, author={Eduardo P{'e}ris Mora and Jordi Pay{'a} and Jos{'e} Mar{'i}a Monz{'o}}, …
This paper presents a review on fly ash as prime materials used for geopolymer. Due to its advantages of abundant resources, less in cost, great workability and high physical properties, fly ash leads to achieving high mechanical properties. Fly ash is considered as one of the largest generated industrial solid wastes or so-called …
It is found that concrete made with 30% fly ash and 0.75% protein by weight of cement gives higher strength than conventional concrete. The increase in compressive strength is 38.78%, flexure ...
The use of high percentages of recycled aggregates in concrete would usually worsen the concrete properties. This paper tries to address the deficiency of the use of recycled aggregates by systematically presenting results on the influence of incorporating Class F fly ash on concrete properties. In this study, two series of …
The base sand used is washed high silica sand, which are in round to sub-angular, and the AFS grain fineness number is 40–60. To prepare the sand mix, the silica sand (base sand) along with fly ash, and binder as molasses, was thoroughly mixed individually mulled for 2 minutes similarly, cement and binder as molasses mulled the …
This study investigates the effects of replacing 50% of the cement content with fly ash. High-volume fly ash (HVFA) concrete, defined as having 50% or more fly …
To resolve the limited large-scale methods of disposal of low calcium fly ash with poor activity, based on the double excitation principle, clinker and desulfurized gypsum are used as alkali/salt activators to activate fly ash and slag, avoiding the inconvenience of strong alkali activating fly ash in industry. Firstly, the strength test of a filling body with …
To reduce the filling cost of high-water backfilling material (HWBM) in mining backfill and improve the recycling utilization of the industrial waste such as the coal fly ash. The ultra-fine fly ...
was 10% SP. The knowledge on the strength and permeability of concrete containing silica fume, fly ash, super pozz and high slag cement could be beneficial in the utilization of these waste materials in concrete work, especially on the topic of durability. KEYWORDS: Permeability, Strength of concrete, Silica fume (SF), Fly ash (FA), Super pozz ...
In this study the influence of crack width, cover depth and concrete quality on corrosion of steel in high performance concrete was investigated. Three mixtures, one control and two more containing corrosion inhibiting admixtures, Calcium Nitrite and Disodium Tetrapropenyl Succinate, in combination with 20% fly ash replacement with …
Though the existing literature focuses abundantly on high volume fly ash concrete, the present work aimed to explore the intricate hydration process thorough a systematic experimental program. ... Yan P (2018) The influence of ground fly ash on cement hydration and mechanical property of mortar. Adv Civ Eng 2018: 4023178. [7] …
At such a replacement level, fly ash could not only improve the workability and cost economy of cementitious composites but could also improve the resistance to …
There has been an increasing attempt for fly ash utilization in different sectors. Loya and Rawani [5] identified top areas for the quantity of fly ash utilization as 44.19% in cement and concrete sectors, 15.25% of ash in roads, embankments and ash dyke raising, followed by 12.49% in reclamation of low lying areas and land filling, 8.84% …
This study used high fineness of fly ash as a cement replacement to improve recycled aggregate concrete properties. The mixture proportions of recycled aggregate concretes were first prepared using recycled coarse aggregate, and then river sand was replaced with recycled fine aggregate at 0, 50, and by weight of …
1.2.7 Chemical Composition. Chemical composition of fly ashes include silica (SiO 2), alumina (Al 2 O 3), and oxides of calcium (CaO), iron (Fe 2 O 3), magnesium (MgO), titanium (TiO 2), sulfur (SO 3), sodium (Na 2 O), and potassium (K 2 O), and unburned carbon (LOI). Amongst these SiO 2 and Al 2 O 3 together make up about …
Test results indicate that the concretes made with high-LOI (8%) fly ash can be successfully produced for structural concrete, which contains fly ash of up to 60% of …
Many concrete ready-mix plants now have multiple silos for storing and dispatching a range of cements and additives, including fly ash. Photo: National Ready Mixed Concrete Association Two and a half …