آخرین محصولات
Durability of fly ash based geopolymer concrete in the presence …
In this context, considering the low cost, low CO 2 emission and low energy usage in the production of fly ash-based geopolymer, fly ash-based geopolymer cement and concrete are regarded as possible alternative green materials to OPC (Zhuang et al., 2016). These materials are still at the beginning stages of development and hence need …
Mining & Quarrying
Spread across various regions of Oman such as Duqm, Salalah, Nizwa, Sohar and other mineral rich regions. Division mission to expand footprints in mining and exports of …
Guide for the Use of Silica Fume in Concrete
7.5—Specifying silica-fume concrete Chapter 8—Proportioning silica-fume concrete mixtures, p. 234R-41 8.1—General 8.2—Cement and silica fume content 8.3—Water content 8.4—Aggregate 8.5—Chemical admixtures 8.6—Proportioning 8.7—Ternary mixtures Chapter 9—Working with silica fume in field concrete, p. 234R-45
Fly ash for sustainable construction: A review of fly ash concrete …
Fly ash for use in concrete: 2015: United Kingdom: BS EN 450-1: Fly ash for concrete. Definition, specifications and conformity criteria: 2012: BS EN 450-2: Fly ash for concrete. Conformity evaluation: 2005: PD CEN/TR 15840: Evaluation of conformity of fly ash for concrete. Guidelines for the application of EN 450-2: 2009: USA: ASTM C618
(PDF) Study on Strength Development of High Strength Concrete …
Study on Strength Development of High Strength Concrete Containing Fly ash and Silica fume. April 2011; ... Oman) for one year. Four mixes namely, control mix ( cement), two binary blended ...
Fresh, mechanical, sorptivity and rapid chloride permeability
The effects of the use of silica fume (SF) and fly ash (FA) on the fresh, mechanical and durability properties of self-compacting concrete (SCC) were experimentally examined. Combinations of F-class FA ranging from 15 to 45% and SF ranging from 5 to 15% were replaced for Ordinary Portland. The effects of FA and SF …
Mix Design for High Strength Concrete with Fly Ash, …
Scholars have researched the mix design of HSC employing fly ash, silica, and ether-based superplasticizers in great detail. A mix design for HSC was suggested in a study by Basha et al. (2017) [4] with a goal compressive strength of 90 MPa. 180 kg/m3 of fly ash, 70 kg/m3 of silica fume, and 0.75%
Mechanical properties and brittleness of concrete made by …
This paper introduced a new concrete composites made by quaternary binder by partially replacing ordinary Portland cement (OPC) with different percentages of supplementary cementitious materials (SCMs). The motivation is to reduce our dependency on OPC to reduce CO2 emission and carbon foot print. As the main substitute for the …
Ready Mix concrete
We are the first in the Sultanate to have acquired an ISO 9001: 2015 certification for production and supply of Ready Mix Concrete in Oman. Our urge to excel has given us the distinction of being pioneers for the supply of concrete with Silica Fume, Fly ash & GGBS to prestigious projects.
Cement Products & Concrete Block Supplier
Pioneers in Oman for the supply of concrete with silica fume, fly ash and GGBS. Approved supplier by PDO, ministries and other government agencies.
Optimization Design of Mix Proportion for Fly …
Utilizing range and variance analyses, this study identified four preliminary optimized compositions of concrete incorporating fly ash, silica fume, basalt fiber, and polypropylene fiber. On this basis, in order …
(PDF) Structural performance of nano-silica modified fly-ash …
a r t i c l e i n f o Article history: Received 20 April 2016 Received in revised form 2 November 2016 Accepted 21 December 2016 Keywords: Fly ash Nano silica Geopolymer concrete Structural performance Micro structure a b s t r a c t The fly ash based geopolymer concrete generally requires heat activation of different temperatures, which …
Effect of silica fume, metakaolin, and low-calcium fly ash …
Among the various mineral additives used in concrete mortars, silica fume (SF) is highly favored for its superior concrete durability properties [3], [4], [5]. There is now considerable evidence that fly ash and metakaolin (MK) similarly improve durability performance [6]. When used as a concrete admixture, these additives combine with …
Galfar Aspire Readymix
In 2011, Galfar established a new company - Galfar Aspire Readymix SPC - to supply the increasingly specialized concrete for construction projects in Oman. GAR is a fully …
Strength and microstructure analysis of sustainable self …
The use of Recycled Coarse Aggregates (RCA) derived from demolition and rubble wastes may also be beneficial and may provide a number of benefits, including maintaining ecological balance, ... Fly ash in self-compacting concrete, fly ash, silica fume, slag and natural pozzolans in concrete. ACI, SP-199 (2001), pp. 259-274. View in …
Very high volume fly ash concrete utilising microash and …
The incorporation of a high volume of fly ash (FA) (up to 80%) in concrete without compromising mechanical and durability properties is potentially very advantageous to the concrete industry in terms of economic, social and environmental benefits. The compressive strength, carbonation, chloride ion penetration, water absorption and …
OMANMIX, concrete mix,
OMANMIX always ensure that quality and uninterrupted production of concrete mix are supplied to its clients projects at all time with complete manpower, equipment, full …
Assarain Concrete Products & Trading LLC
Originally established in 1984, we now lead the way as one of the largest manufacturers and suppliers of concrete products in Oman with our annual production capacities …
Effect of nano-silica in concrete; a review
Nano-silica (nS) or silica nanoparticles, also known as silicon dioxide nanoparticles, can be used as additives for improving concrete's mechanical and durability properties [24], [25], [26].The effect of nS on nanostructure of cement paste also confirmed the improvement in concrete durability [27].The results revealed the nS as an excellent …
Fly Ash Substitution in Lightweight Concrete for Rigid …
Peatlands are more likely to be affected by intense precipitation and soil erosion, thus requiring modifications for stabilized soil and subgrade protection. This experimental study aimed to find a suitable pavement type using fly ash, an unutilized byproduct from coal burning processes, for peatland areas with a low bearing capacity. …
Benefits and Detrimental Effects of Fly Ash in …
What are the benefits and constraints of fly ash in concrete? Key benefits Reduced water demandIncreased workabilityImprove permeabilityImprove durabilityLow heat of hydration …
Using Class C Fly Ash to Mitigate Alkali Silica Reactions …
USING CLASS C FLY ASH TO MITIGATE ALKALI SILICA REACTIONS IN CONCRETE Bruce C. Dockter Energy & Environmental Research Center, Un iversity of North Dakota, 15 North 23rd Street, Stop 9018, Gr and Forks, ND 58202-9018 KEYWORDS: Class C fly ash, alkali silica reactivity, ASR ABSTRACT
Fly ash, silica fume, slag & other mineral by-products in concrete
Semantic Scholar extracted view of "Fly ash, silica fume, slag & other mineral by-products in concrete" by V. Malhotra et al.
Effects of Fly Ash and Silica Fume on High Performance Concrete
Title: Effects of Fly Ash and Silica Fume on High Performance Concrete Author(s): S. Nagataki, S. Miyazato and T. Saitoh Publication: Symposium Paper Volume: 178 Issue: Appears on pages(s): 307-330 Keywords: admixtures; fly ash; silica fume; strength. DOI: 10.14359/5986 Date: 6/1/1998 Abstract: These days, large and …
Early-Age Cracking of Fly Ash and GGBFS Concrete Due to …
Supplementary cementitious materials (SCMs) are eco-friendly cementitious materials that can partially replace ordinary Portland cement (OPC). The occurrence of early-age cracking in OPC-SCM blended cement is a significant factor impacting the mechanical properties and durability of the concrete. This article presents a …
Durability properties of high volume fly ash concrete …
This paper reports the results of an experimental study on durability of ordinary concrete and high volume fly ash (HVFA) concrete containing nano silica (NS). In this study, concretes containing 2 and 4 % of NS are prepared at a constant water/binder ratio of 0.4 for testing ages of 3, 7, 28, 56 and 90 days. The concrete containing 2 % NS …
Utilization of silica fume with fly ash and properties of …
This research paper is about the Utilization of Silica Fume with Fly Ash and Properties of Portland Cement-Silica Fume-Fly Ash-Concrete. Concrete is a man or a machine-made construction material that has more usage in the construction field, It is necessary to make construction secure and safe for making high strength concrete the …
Strength and microstructure analysis of sustainable self …
In order to partially replace the OPC and Natural Coarse Aggregates (NCA) for the production of M−30 grade SCC, the current work explores and uses a …
Silica fume as Partial Replacement of Cement in Concrete
A large amount of by-product or wastes such as fly-ash, copper slag, silica fume etc. Are generated by industries, which causes environmental as well as health problems due to dumping and disposal ...
Cement Products & Concrete Block Supplier
Our Facilities. To maintain its place as the market leader in the construction sector, the Cement Products & Services Division continues to invest in state-of-the-art technology & has the country's only chilled aggregate plant & a crusher with a cyclone washing system.It also has over 50-owned mobile concrete pumps with 36 to 56 m boom length and over …
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