Mechanical properties prediction of metakaolin and fly ash
The clay was collected from the local area of Jamshedpur and heated in muffle furnace at 900 °C to convert it into metakaolin. The fly ash was collected from the TATA steel plant Jamshedpur. The photograph of the fly ash and metakaolin is shown in Fig. 1. Table 1 shows the chemical composition of the metakaolin and fly ash. The …
Mechanical and bond behaviour of high volume Ultrafine-slag blended fly
Preparation and tests for workability, compressive and bond strength of ultra-fine slag based geopolymer as concrete repairing agent. Constr. Build. Mater., 154 (2017), pp. 176-190. ... Effect of sand, fly ash, and coarse aggregate gradation on preplaced aggregate concrete studied through factorial design. Constr. Build. Mater., 93 ...
Performance of high volume fly ash concrete
Coarse aggregate/sand ratio = 1.8: 160 ... For high-volume ultra-fine fly ash mortars modified with silica fume, the addition of HL improved 7 day and 28 day strengths by 42.9 and 117.6%. However, the NS modified mortars were negatively affected by the addition of HL where the 7 day and 28 day compressive strengths were reduced by 19.6 …
Air classifiers
Efficient, ecological and economical separation. Air classifiers separate and recover ultrafine, fine and coarse materials in mining, aggregates production, sand manufacturing and other industrial processes. Dry classifying is often more environmental and economical alternative to wet classifying as no water is used. Highly accurate separation.
Rice husk (RH) as additive in fly ash based geopolymer …
ratio of solid/liquid (S/L), Na2SiO3/NaOH and sand/fly ash were fixed at 2.0, 2.5 and 0.3 [10-11]. The RH was added in the range of 0% to 20% by weight of the binder. A mechanical mixer was used ...
Multicriteria optimization of the composition, …
Multicriteria optimization results for fly-ash as an additive on metakaolin-based geopolymer composites show that the optimal composition of the geopolymer matrix within the selected variation ...
Ultrafine grinding of fly ash with grinding aids: Impact on …
Introduction. Fly ash is a pozzolanic materials containing aluminosilicate glass formed after the burning of pulverized coal [1]. It is rich in SiO 2, Al 2 O 3 in chemical composition, accounting for about 80% of the total mass. Moreover, mineral phase of fly ash is mainly composed of spherulitic glass phase which accounts for more than 50% of …
Effect of Ultrafine Fly Ash and Water Glass Content on the …
It was found that fly ash activity is directly related to their particle size [23,24,25]. In this paper, based on the wet-grinding process developed by our team, ultra-high activity, wet-grinding ultrafine fly ash (WUFA) was prepared [26,27,28]. The alkali-activated WUFA-PS-based geopolymer was prepared by using phosphorus slag and wet-grinding ...
Numerical and experimental investigation on mechanical …
The roles of ultra-fine fly ash and its minute physics in guarantying the strength of mortar have been explored to a larger extent. ... Effect of waste-based micro cellulose fiber as pore maker on characteristics of fired clay bricks. Construction and Building Materials, Volume 300, 2021, Article 124298 ... Ertugrul Erdogmus. …
(PDF) Strength and Permeability Characteristics of
Unconfined compressive strength values of grouted sand with high volume fly ash ranged between 410 and 1107 kPa. Morover, cohesion values were comparable to microfine cement grouting ranging from ...
Preparation of Ultrafine -Al2O3 Powder from Fly Ash by
Preparation of Ultrafine -Al2O3 Powder from Fly Ash by Ammonium Sulfate Roasting Technology. April 2020. DEStech Transactions on Environment Energy and Earth Science. DOI: 10.12783/dteees ...
Research on properties evolution of ultrafine fly ash and …
For ultrafine fly ash (UFA), the specific surface area may reach 600–700 m 2 /kg, which is about two times higher than that of FA [6]. The hydration of UFA and cement composite (UFAC) is significantly different from FAC [6], [7]. UFA, due to its finer grains has higher reactivity and will react more with calcium hydroxide (CH) to form calcium ...
The relevance of ultrafine fly ash properties and mechanical …
The two kinds of fly ash were ultrafine grinded by ultrafine grinder (TLB-4008), as shown in Fig. 1.The grinding process followed a procedure as, 1) confirming the tight close of the grinding chamber, starting the grinder and adjusting its rotation speed to 30 Hz, and 2) loading raw fly ashes slowly into the rotating grinding chamber from the …
Effects of Ultrafine Fly Ash on Setting, Strength, and …
The workability had a decreasing trend due to the addition of OPC or GGBS as high calcium powder to fly-ash based AAB [110, 120, 127]. Quartz sand with a particle size of up to 50 µm improves the ...
Low carbon cementitious materials: Sodium sulfate activated ultra-fine
Blast furnace slag (slag) is a by-product of the extraction of iron from ore, and it is available in most countries (Limbachiya et al., 2016).Slag and fly ash (FA) were used as the alkali-activated precursor, and the activator was sodium sulfate (Na 2 SO 4, NS).The chemical compositions of slag and FA are listed in Table 1.It was seen that the CaO …
Agro-industrial-based wastes as supplementary cementitious …
An attempt to shed light on the use of agro-industrial-based wastes as supplementary cementitious material (SCM) or as alkali-activated binder (AAB) material is mainly focused in this review paper. The SCM or AAB acts as a suitable replacement for cement, as the cement manufacturing tends to contribute to 8–10% of global CO2 …
Research on mechanical properties and hydration
An alternative method of obtaining ultrafine fly ash is by producing fly ash microspheres ... Natural river sand with a fineness modulus of 1.8 was also utilized in preparing UHPC mortars. Additionally, copper-coated straight steel fibers with dimensions of 13 mm in length, 0.2 mm in diameter, and a length-to-diameter ratio of 65 were utilized ...
Mechanical behavior and microstructure evolution of slag-fly ash …
The dissolution of active substances in fly ash and slag consolidated water glass, and the unreacted particles of fly ash and slag are wrapped and tightly bonded [30]. According to Fig. 9 (a), it can be explained that the quantity of polymer particles in the composite activator specimens (B-S19, C-S23, and D-S26) is more. Therefore, the early ...
Optimization of Magnesium Potassium Phosphate Cements Using Ultrafine
Abstract. The effect of ultrafine fly ash (UFA) and fly ash (FA) on the physical properties, phase assemblage, and microstructure of magnesium potassium phosphate cement (MKPC) was investigated. This study revealed that the UFA addition does not affect the calorimetry hydration peak associated with MKPC formation when …
Effects of ultrafine fly ash on the properties of high …
Ultrafine fly ash was added in the concrete mixtures in two different replacement ratios: 20 and 35 % in comparison with the control group. The water–to-binder ratio was 0.28. Standard curing and temperature matching curing methods were applied. Results showed that ultrafine fly ash decreased the adiabatic temperature rise of …
Preparation of ultrafine fly ash by wet grinding and its …
In this study, to promote the chloride binding capacity of coal fired fly ash (RFA) in cementitious materials, wet grinding was employed and ultrafine fly ash (UFA) with D50 = 2.1 μm was prepared ...
Effects of Ultrafine Fly Ash on Setting, Strength, and …
This paper presents the effects of ultrafine fly ash on setting, strength and porosity of geopolymer paste specimens cured at 20°C. Addition of ultrafine fly ash reduced setting time and improved compressive strength of geopolymers based on fly ash only or fly ash blended with 15% ground granulated blast-furnace slag (GGBFS) or 10% …
Optimization of Magnesium Potassium Phosphate Cements Using Ultrafine
The ultrafine grinding of fly ash releases the smaller microspheres contained in the larger/hollow fly ash particles. 24 At present, UFA is widely used as a mineral admixture in high-performance concrete. 25,26 UFA is an ideal material to utilize due to its smaller particles, which when mixed with Portland cement can lead to the formation of ...
Dynamic experiments on flocculation and sedimentation of …
Several harmful byproducts can be produced in the stainless-steel industries, such as fly ash and ultrafine particle, which can easily bioaccumulate leak and snuff, and pose a critical menace to ...
Effect of ultra-fine fly ash on concrete performance and durability
The impact of ultra-fine fly ash on material properties was investigated following an upscaling as an approach considering paste, mortar and concrete properties. Two types of cement, Portland ...
Some factors affecting early compressive strength of …
The use of ultrafine fly ash (UFA) in high-performance concrete has many results [1], [2], [3], but there is little study on steam curing of UFA concrete. This is due to the fact that compressive strength and other mechanical properties of UFA concrete depend on the content of UFA, water–binder ratio, and curing conditions. ... The sand came ...
PVA fiber-reinforced ultrafine fly ash concrete: Engineering …
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 … Expand
Ultra Fine Fly Ash
Supperpozz P500 (Ultra Fine Fly Ash) Our 27+ years of experience in the processing and distribution of Fly Ash keeps us at the spearhead of the industry. SUPPERPOZZ P500. ASHTECH's product research team have developed an Ultra Fine Fly Ash used in production of high performance concrete. This innovative new age formulation …
Strength and Leaching Patterns of Heavy Metals from Ash …
Solidified flowable fill comprising of Type I portland cement, Class F fly ash, fine sand and water, is a porous monolith. In the case of excavatable fill, material mix proportions in the ash must be such that adequate but inexcessive strength is developed. For non-excavatable fill, maximization of fill strength is the primary objective.
Drying shrinkage prediction of paste containing meta …
A Type III portland cement meeting ASTM C150 specification was used for the experimental study [29].The Blaine's surface area of the cement was 540 m 2 /kg. Three types of SCM were used for study, which were class F ultrafine FA with an average particle size of 3 μm, high reactive MK with an average particle size of 1.4 μm, and a low carbon …