A review on the utilization of fly ash

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Properties Of Concrete

Humidity measurement is one of the most significant issues in various areas of applications such as instrumentation, automated systems, agriculture, climatology and GIS. Numerous sorts of humidity sensors fabricated and developed for industrial and laboratory applications are reviewed and presented in this article. The survey frequently concentrates on the RH sensors based upon their organic and inorganic functional materials, e.g., porous ceramics (semiconductors), polymers, ceramic/polymer and electrolytes, as well as conduction mechanism and fabrication technologies. A significant aim of this review is to provide a distinct categorization pursuant to state of the art humidity sensor types, principles of work, sensing substances, transduction mechanisms, and production technologies. Furthermore, performance characteristics of the different humidity sensors such as electrical and statistical data will be detailed and gives an added value to the report. By comparison of overall prospects of the sensors it was revealed that there are still drawbacks as to efficiency of sensing elements and conduction values. The flexibility offered by thick film and thin film processes either in the preparation of materials or in the choice of shape and size of the sensor structure provides advantages over other technologies. These ceramic sensors show faster response than other types.

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Humidity Sensors Principle, Mechanism, and Fabrication Technologies: A Comprehensive Review

Properties and composition of recycled aggregates from construction and demolition waste suitable for concrete production

Ash-related issues during biomass combustion: Alkali-induced slagging, silicate melt-induced slagging (ash fusion), agglomeration, corrosion, ash utilization, and related countermeasures

This paper presents part of the results of an ongoing laboratory study carried out to design a structural lightweight high strength concrete (SLWHSC) made with and without ternary mixtures of cement-fly ash-silica fume. In the mixtures, lightweight basaltic-pumice (scoria) aggregate was used. A concrete mixture made with lightweight scoria, and another lightweight scoria concrete mixture incorporating 20% fly ash and 10% silica fume as a cement replacement, were prepared. Two normal weight concretes were also prepared for comparison purposes. The 28 day compressive strength and air dry unit weight of structural lightweight concrete (SLWC) varied from 28 to 37 MPa and 1800 to 1860 kg/m3, respectively. Laboratory test results showed that structural lightweight concrete SLWC of 30 MPa at 28 days can be produced by the use of scoria. However, the use of mineral additives seems to be mandatory for the production of SLWHSC of 35 MPa or higher grade.

https://journals.tubitak.gov.tr/engineering/issues/muh-04-28-2/muh-28-2-2-0304-5.pdf

High Strength Lightweight Concrete Made with Ternary Mixtures of Cement-Fly Ash-Silica Fume and Scoria as Aggregate

Fresh, Mechanical, Transport, and Durability Properties of Self-Consolidating Rubberized Concrete

Effect of different storage methods on thermal and mechanical properties of mortar containing aerogel, fly ash and nano-silica

The demand for cement usage increases in the world, currently. It is known that using industrial waste materials in concrete as cement or aggregate replacement as part of waste management as well as conserving natural resources is getting wider. Due to these facts, in this work, an investigation was carried out on the utilization of waste marble powders as cement replacement mineral materials. In this context, marble powder replaced cement at 5%, 10%, 15% and 20% in mass basis, and mortars were produced. In mortar mixtures, water-binder ratio was chosen as 0.5, and sand-binder ratio was taken as 3. Workability of fresh mortar was measured. Unit weight, water absorption, and porosity, compressive and flexural strengths, abrasion, carbonation and drying shrinkage measurements testing were carried out on hardened mortar specimens. Influence of elevated temperature on hardened mortar mixture was also investigated. As a result of laboratory study, it is concluded that replacing marble powder with cement result with a favourable contribution to workability of fresh mortar, as well as resistance to elevated temperature. It also reduced drying shrinkage of mortar in comparison to reference mortar made without marble powder. However, it influenced water absorption, abrasion, and carbonation resistance of mortar, unfavourably. For short term curing duration, replacement of marble powder with cement reduced compressive strength insignificantly for 5% and 10% marble powder replacement, but, reduced it significantly for 15% and 20%. However, at long term curing at 90 days, the difference between strength of reference mortar and marble containing mortar was diminished, particularly for mortar containing 5% and 10% marble powde

/pdf/influence-of-waste-marble-powder-as-a-replacement-of-cement-w40e8c5ia1.pdf

Influence of waste marble powder as a replacement of cement on the properties of mortar

In this study, some durability properties of alkali-activated slag (geopolymer) mortars were investigated. In determining these durability properties, a series of test procedures such as high temperature, abrasion, rapid chloride permeability and wetting and drying cycles were performed. For the slag activation, sodium metasilicate was used at three sodium concentrations, 4%, 8% and 12% by mass of slag. Prismatic specimens with 40 × 40 × 160 mm dimensions were prepared from geopolymer mortars for the tests. After 24 h, the specimens were demolded and cured in three different ways until the test time: curing in an oven at 75 °C for 1 day, curing in air for 28 days and curing in water at 22 ± 1 °C. The results obtained from the tests were compared with the control mortar made with ordinary Portland cement (OPC).The findings revealed that the resistance of alkali-activated slag mortars under aggressive media investigated within the scope of this work was higher than that of OPC mortar.

Cengiz Duran Atiş

Papers

High Strength Lightweight Concrete Made with Ternary Mixtures of Cement-Fly Ash-Silica Fume and Scoria as Aggregate

Fresh, Mechanical, Transport, and Durability Properties of Self-Consolidating Rubberized Concrete

Effect of different storage methods on thermal and mechanical properties of mortar containing aerogel, fly ash and nano-silica

Influence of waste marble powder as a replacement of cement on the properties of mortar

Durability Properties of Geopolymer Mortars Containing Slag