The influence of ophiolitic crushed fine aggregate properties on the performance of cement mortars

2021 ◽  
Author(s):  
Revecca Fournari ◽  
Ioannis Ioannou ◽  
Ioannis Rigopoulos
Keyword(s):  
Fine Aggregate ◽  
Aggregate Properties ◽  
Cement Mortars

Influence of Different Types of Fine Aggregate on Cement Composites Resistance to High Temperatures

2014 ◽  
Vol 1000 ◽  
pp. 126-129 ◽  
Author(s):  
Tomáš Melichar ◽  
Jiří Bydžovský
Keyword(s):  
Mineralogical Composition ◽  
Mechanical Tests ◽  
Basic Material ◽  
Fine Aggregate ◽  
Cement Composites ◽  
Cement Mortars ◽  
Different Types ◽  
Natural Aggregates ◽  
The Impact

The paper discusses the impact of several selected aggregates on the basic material characteristics of cement composites. Both artificial and natural aggregates (four types in total) with different mineralogical composition were evaluated. The specimens were exposed to environments with the temperature up to 1000°C and then subjected to physico-mechanical tests. For the follow-up development of polymer-cement mortars, we selected two types of aggregates – fly ash aggloporite (FAA) and amphibolite (AMA).

Fine-Aggregate Angularity: Automated Image Analysis Approach

2000 ◽  
Vol 1721 (1) ◽  
pp. 66-72 ◽  
Author(s):  
Eyad Masad ◽  
Joe W. Button ◽  
Tom Papagiannakis
Keyword(s):  
Image Analysis ◽  
Visual Analysis ◽  
Imaging Techniques ◽  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Automated Image Analysis ◽  
Fine Aggregate ◽  
Smoothing Effect ◽  
Aggregate Properties ◽  
Wide Range

Angularity is one of the important aggregate properties contributing to the permanent deformation resistance of asphalt mixtures. Therefore, methods that are able to rapidly and accurately describe aggregate angularity are valuable in the design process of asphalt mixtures. Two computer-automated procedures, which make use of the advances in digital-image processing, to quantify fine aggregate angularity, are presented. The first method relies on the concepts of the erosion-dilation techniques. This consists of subjecting the aggregate surface to a smoothing effect that causes the angularity elements to disappear from the image. Then, the area lost as a result of the smoothing effect is calculated and used to quantify angularity. The second method is based on the fractal approach. Image-analysis techniques are used to measure the fractal length of aggregate boundary. The fractal length increases with aggregate angularity. The proposed imaging techniques are used to capture the aggregate angularity of 23 sand samples that represent a wide range of materials. The results are compared with visual analysis and indirect methods of measuring fine-aggregate angularity, such as the uncompacted air voids, and the angle of internal friction of aggregate mass. In general, the results indicate much promise for measuring aggregate properties using automated imaging technologies.

Effect of copper slag as a fine aggregate on the properties of cement mortars and concrete

2011 ◽  
Vol 25 (2) ◽  
pp. 933-938 ◽  
Author(s):  
Khalifa S. Al-Jabri ◽  
Abdullah H. Al-Saidy ◽  
Ramzi Taha
Keyword(s):  
Copper Slag ◽  
Fine Aggregate ◽  
Cement Mortars ◽  
Effect Of Copper

scholarly journals Effect of Superplasticizer Dosage on Compressive Strength and Microstructure of High Volume Basic-Oxygen Slag Mortar Exposed to Sea Water Attacks

2021 ◽  
Vol 10 (1) ◽  
pp. 11-20
Author(s):  
Ahmed S. Ouda
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Sea Water ◽  
Tap Water ◽  
Water Solution ◽  
Fine Aggregate ◽  
Offshore Structure ◽  
Natural Sand ◽  
Basic Oxygen ◽  
Cement Mortars

The influence of superplasticizer addition on durability reinforcement of cement mortars made with basic-oxygen blast-furnace slag fine aggregate (BOF) as completely substitute for natural sand after being exposed to sea water solution for 6 months was evaluated by determining physico-mechanical characteristics in terms of water absorption and compressive strength in addition to microstructure analysis. In this procedure, all studied mixtures were doped with 1% and 2% superplasticizer. After the initial curing of samples in tap water for 28 days, they were subjected to sea water solution for 6 months using water to binder ratios of 0.35 and 0.45. The new hydration phases and microstructure of hardened specimens were identified by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The results showed that cement mortars with slag fine aggregate blended with 2% SP offered better water absorption, compressive strength and microstructure than their counterparts with natural sand against sea water attacks. Therefore, they can be used in offshore structure applications.

Compressive Strength of Ground Waste Seashells in Cement Mortars for Masonry and Plastering

2015 ◽  
Vol 727-728 ◽  
pp. 167-170 ◽  
Author(s):  
Chin Peow Woon ◽  
Poi Ngian Shek ◽  
Mahmood Md Tahir ◽  
Ahmad Beng Hong Kueh
Keyword(s):  
Compressive Strength ◽  
Cement Mortar ◽  
Crumb Rubber ◽  
Construction And Demolition Waste ◽  
Fine Aggregate ◽  
Demolition Waste ◽  
River Sand ◽  
Waste Wood ◽  
Green Mussel ◽  
Cement Mortars

For environmental protection and sustainable development, many research studies have been carried out on the utilization of waste materials in construction such as fly ash, mine tailings, slags, construction and demolition waste, wood sawdust, rice husk ash, crumb rubber and etc. In this study, two types of waste seashells; green mussel and cockle were tested experimentally to replace fine aggregate in cement mortar. The compressive strength of the cement mortar with seashells were compared with those of a control mortar that was made of a conventional river sand. The main parameter of this study was the proportion of ground seashells used as sand replacement (25%, 50%, 75% or 100% by weight). Incorporation of cockle in cement mortar resulted in higher compressive strength as compared to conventional mortar up to 110 percent. However, incorporation of green mussel resulted in decrement in compressive strength by 67 percent. The results indicate that ground seashells can be applied as a sand replacement in mortar mixes and may improve the compressive strength of rendering and plastering mortar.

scholarly journals Strength and Durability Characteristics of Cement-lime Mortars with Fly Ash and Slag as Aggregate Substitutes

2021 ◽  
Author(s):  
Jacek Katzer ◽  
Paweł Kończalski
Keyword(s):  
Fly Ash ◽  
Strength Properties ◽  
Waste Materials ◽  
Future Research ◽  
Fine Aggregate ◽  
Natural Sand ◽  
Cement Mortars ◽  
Lime Mortars ◽  
The World ◽  
Strength And Durability

The global consumption of sand by the concrete industry has increased significantly over the years. Natural sand has become a desired commodity in numerous regions of the world. To protect both the existing resources of natural sand and utilize waste materials, drastic actions are urgently needed. The production of cement mortars, which are solely based on fine aggregate, is responsible for the large consumption of natural sand. In the described research program, we proposed to substitute 50 % of the natural sand in mortars with fly ash and slag. The strength properties and durability characteristics of the new mortars were tested. It was proved that mortars with fly ash and slag can be used for specific applications in civil engineering. Areas for future research associated with the mortars in question were also pointed out.  

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