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% …
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, …
Heat evolution of high-volume fly ash concrete. The evolution of heat in high volume fly ash concrete is calculated by observing the rise in temperature in concrete under adiabatic curing conditions. For this experiment, a thermocouple is used. The concrete sample prepared was placed inside a control box which was insulated.
Influence of class F fly ash on the abrasion–erosion resistance of high-strength concrete Tsong Yen a, Tsao-Hua Hsu b,*, Yu-Wen Liu c, Shin-Ho Chen b a Department of Civil Engineering, National Chung-Hsing University, Taiwan, ROC b Concrete Test and Research Center of Taipower Company, 250 Kuo Kuang Road, Taichung 40227, …
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 ...
The dispersion of fly ash in water results in an alkaline pH from 10 to 13. At high pH, the fly ash becomes negatively charged allowing the removal of heavy metal ions by precipitation and electrostatic adsorption from water (Cho et al., 2005). Fly ash can be modified or transformed into new materials for heavy metal ions adsorption.
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 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 ...
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 …
June 2 3rd International Conference on Bio-Based Building Materials 6 th- 28 2019 Belfast, UK 1 INFLUENCE OF FLY ASH ON THE COMPRESSIVE STRENGTH AND YOUNG'S MODULUS OF CONCRETE P. R. Lustosa1, M ...
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 ...
recycled cement and fly ash improves the mechanical performance of mortars relative to those with recycled cement only or fly ash only. Keywords: ternary binders; recycled …
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 utilization of class F fly ash (F-FA) is limited to 15–30% as a substitution for cement. The study intends to tap into the potential of high-volume F-FA as a pozzolan and micro filler by ...
- Physical-durable performance of concrete incorporating high loss on ignition-fly ash Trong-Phuoc Huynh, Si-Huy Ngo and Chao-Lung Hwang - Mechanical properties of steel/kenaf (hybrid) fibers added into concrete mixtures A O Baarimah and S M Syed Mohsin - Assessment of high performance concrete containing fly ash and calcium …
Ultrafine admixtures (UA) [Blast Furnace Slag (BFS), Silica Fume (SF), Fly Ash (FA), Limestone (LS)]-Decrease: Yield stress and viscosity.-The effect of ultra-fine slag is more obvious when the UA content is more than 15%.-Spherical shape of fly ash particles is found to reduce the viscosity and the yield stress of fresh cement pastes. …
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 …
Chen H, Shih N, Wu C (2019) Effects of the loss on ignition of fly ash on the properties of high-volume fly ash concrete. Google Scholar Chindaprasirt P, Jaturapitakkul C, Sinsiri T (2005) Effect of fly ash fineness on compressive strength and pore size of blended cement paste. Cem Concr Compos 27(4):425–428.
Driven by the insatiable demand for construction materials, excessive quarrying for natural aggregates and the demand for raw materials for cement production pose significant environmental challenges, including habitat loss and resource depletion. To address these concerns, this study investigates the use of fibre-reinforced self …
The study focuses on a high-volume fly ash cement mortar hybrid containing nano-silica ftabledioxide and steel fibers. • The addition of NS and SF significantly enhanced the flexural and compressive strength of high-volume fly ash mortar. • Adding 1.0 vol% SF and 2.0 wt% NS increased flexural and compressive …
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%.
Taking all this into consideration, fly ash is a high-value reliable mineral component. Handling/Quality control of Fly Ash Handling. For the handling of fly ash, the same equipment as that for cement can be used but with some modifications. Fly ash has a higher dust emission, is highly compactable, and is less sticky than cement.
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 ...
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 …
Fly ash makes concrete workable; increasing its levels may reduce water demand and superplasticizer needs. • Fly ash can improve mechanical and durability …
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] …
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 …
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 …
The results indicate that the slump loss of the recycled aggregate concrete with fly ash was reduced to lower than that of the recycled aggregate concrete without fly ash when the fineness of the fly ash was increased, which increased the slump loss of the fresh concrete. Fly ash can be used to increase the compressive strength of recycled ...
The mix proportions of HVFA-cement mortars are shown in Table 2.The mix proportions of HVFA-cement mortars were selected based on ISO 679-2009 [], in which a batch of mortar specimens consists of 450 g cement, 1350 g sand, and 225 g water.In particular, the FA contents of HVFA-cement mortar or HVFA concrete is in the range of …
The hydration processes of high-volume fly ash cement paste were investigated by examining the non-evaporable water content, the CH content, the pH of pore solution and the fraction of reacted fly ash, curing at either 20°C or elevated temperatures after an initial curing at 20°C. ... and S6(A), 3% of Na 2 SO 4 was added to …
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 …
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, …
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 …