scholarly journals Crushing Performance of Ultra-Lightweight Foam Concrete with Fine Particle Inclusions

2019 ◽  
Vol 9 (5) ◽  
pp. 876 ◽  
Author(s):  
Yu Song ◽  
David Lange
Keyword(s):  
Mechanical Performance ◽  
High Volume ◽  
Fine Aggregate ◽  
Micro Computed Tomography ◽  
Foam Concrete ◽  
Recycled Fine Aggregate ◽  
High Volume Fly Ash ◽  
Cellular Microstructure ◽  
Strength Material ◽  
Sand Particles

Foam concrete is a low-density controlled strength material that can potentially be used for accommodating different types of particles—recycled fine aggregate being an example. The paste matrix of this material has a cellular microstructure, and bulk performance is readily affected by the inclusion of fines. To study the effect of inclusion of fines on mechanical performance and foam structure of foam concrete, a group of 0.55 g/cm3 foam–sand composite mixtures with high-volume fly ash replacement are investigated. The elastic modulus is measured by a vibrational frequency test. The crushing mechanics are determined by the load-displacement response from a penetration test. The effect of particle inclusion on the foam concrete microstructure is characterized using micro computed tomography. The results indicate that use of fine-graded sand particles at a small dosage simultaneously reduces cement content and enhances the crushing performance, however poor material performance is observed for a high sand content. The cellular structure of the foam–sand composite, and thus its mechanical behavior, can be substantially diminished by larger sand particles, especially when the particle size is larger than the voids in foam.

scholarly journals Engineering and Manufacturing Technology of Green Epoxy Resin Coatings Modified with Recycled Fine Aggregates

2021 ◽  
Author(s):  
Kamil Krzywiński ◽  
Łukasz Sadowski ◽  
Damian Stefaniuk ◽  
Aleksei Obrosov ◽  
Sabine Weiß
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Construction And Demolition Waste ◽  
Fine Aggregate ◽  
Micro Computed Tomography ◽  
Demolition Waste ◽  
Replacement Ratio ◽  
Recycled Fine Aggregate ◽  
Fine Aggregates ◽  
Computed Tomography Scanning

AbstractNowadays, the recycled fine aggregate sourced from construction and demolition waste is not frequently used in manufacturing of epoxy resin coatings. Therefore, the main novelty of the article is to prepare green epoxy resin coatings modified with recycled fine aggregate in a replacement ratio of natural fine aggregate ranged from 20 to 100%. The microstructural properties of the aggregates and epoxy resin were analyzed using micro-computed tomography, scanning electron microscopy and nanoindentation. The macroscopic mechanical properties were examined using pull-off strength tests. The highest improvement of the mechanical properties was observed for epoxy resin coatings modified with 20% of natural fine aggregate and 80% of recycled fine aggregate. It has been found that even 100% of natural fine aggregate can be successfully replaced using the recycled fine aggregate with consequent improvement of the pull-off strength of analyzed epoxy resin coatings. In order to confirm the assumptions resulting from the conducted research, an original analytical and numerical failure model proved the superior behavior of modified coating was developed.

Long term mechanical performance of nano-engineered high volume fly ash concrete

2021 ◽  
pp. 103168
Author(s):  
Charith Herath ◽  
Chamila Gunasekara ◽  
David W. Law ◽  
Sujeeva Setunge
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
High Volume ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash

scholarly journals Effect of Sand Size on Mechanical Performance of Cement-Based Composite Containing PVA Fibers and Nano-SiO2

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 325 ◽  
Author(s):  
Yi-Feng Ling ◽  
Peng Zhang ◽  
Juan Wang ◽  
Yan Shi
Keyword(s):  
Fracture Toughness ◽  
Mechanical Performance ◽  
Silica Sand ◽  
Fine Aggregate ◽  
Reinforced Composites ◽  
Nano Sio2 ◽  
Flexural Tensile Strength ◽  
Fracture Performance ◽  
Sand Particles ◽  
Sand Size

Both finer sand and nanoparticles have a filler effect on mechanical performance of cement-based composite. In this paper, the influence of sand size in mechanical performance of cement-based composites, containing polyvinyl alcohol fiber (PVA) and nano-SiO2 (NS), was investigated. The studied mechanical performance, included compressive, flexural, tensile strength, and fracture toughness. A 0.9% volumetric percentage of PVA and a 2% NS mass content were used to make cement-based composites with a 0.38 w/b. Silica sand with four sand size ranges (380–830 μm, 212–380 μm, 120–212 μm and 75–120 μm) was adopted as fine aggregate. The 28-day curing was conducted for all specimens under 20 °C and 95% humidity. It is concluded that the finer sand decreased workability and mechanical strength of PVA-reinforced composites containing NS. However, this reduction was very limited for the sand particles less than 380 µm. The ultimate tensile stain, fracture toughness, and energy were decreased as sand size declined. In addition, the fracture performance of the composites was greatly dependent on fracture energy.

scholarly journals Development of High Volume Fly Ash Concrete Incorporating Steel Fibre

2020 ◽  
Vol 9 (2) ◽  
pp. 426-433
Keyword(s):  
Fly Ash ◽  
Aspect Ratio ◽  
Thermal Power ◽  
High Volume ◽  
Fine Aggregate ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash ◽  
Hardened Properties ◽  
Very High ◽  
Split Tensile Test

Concrete is most frequently used composite material. Concrete is homogeneous mix of fine aggregate, Coarse aggregate and binding medium of concrete paste .Due to `high demand of cement Co2 emission is very high, It leads to global warming. So in this project high volume fly ash concrete was incorporated. Fly ash is the waste material obtained from thermal power plant. In this paper we investigated about high volume fly ash in different percentage of replacement 55, 60, 75 percentage. Layered pavement is incorporated with Steel fiber in a different aspect ratio (15, 30, 40).layered pavement will give good thermal expansive properties. By varying fly ash content and Steel fibers Aspect ratio of different mixes were arrived hardened properties of these nine mixes were arrived such as Compression test, Split tensile test and Flexural test.

Durability and Mechanical Properties of Self-Compacting Concrete Incorporating Recovered Filler from Hot Mix Asphalt Plants and Recycled Fine Aggregate

2021 ◽  
Vol 894 ◽  
pp. 95-101
Author(s):  
Sepehr Ghafari ◽  
Fereidoon Moghadas Nejad ◽  
Ofelia Corbu
Keyword(s):  
Compressive Strength ◽  
Hot Mix Asphalt ◽  
Mechanical Performance ◽  
Fine Fraction ◽  
Production Plant ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Limestone Filler ◽  
Recycled Fine Aggregate ◽  
Maximum Particle

In this research, a sustainable approach is followed to develop efficient mixtures incorporating recycled fine aggregate (RFA) remained from structure demolition as well as limestone filler (LF) from production of hot mix asphalt (HMA). The LF is a byproduct of the drying process in HMA production plant which is not entirely consumed in the production of the HMA and must be hauled and disposed in landfills. The maximum particle size of the LF is approximately 40 µm. Self-Compacting Concrete (SCC) mixtures were designed replacing 5% and 10% of the cement with LF. Incorporation of 50%, and 100% RFA with the fines in the mixtures were considered with and without addition of the LF. Due to the formwork and prefabrication restrictions, the paste volume and the high range water reducer content were tuned in such a way that the slump flow of the mixtures remained between 660 mm to 700 mm without segregation. Durability and mechanical performance of the mixtures were evaluated by resistance against freeze-thaw scaling exposed to deicing agents and compressive strength. It was observed that the SCC mixtures containing 10% LF outperformed those without the use of LF while 5% SCC mixtures did not exhibit tangible superiority. Incorporation of RFA as the fine fraction degraded the durability of all the mixtures. While replacing all the fine fraction with RFA significantly impaired durability and compressive strength, 50% RF mixtures could be designed containing 10% LF that remained in the allowable limits.

Strengths Investigation of Air Entrained Recycled Fine Aggregate Mortar

2012 ◽  
Vol 253-255 ◽  
pp. 432-435
Author(s):  
Jiu Su Li ◽  
Chun Li Qin
Keyword(s):  
Flexural Strength ◽  
Mechanical Performance ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Optimum Dosage ◽  
Recycled Fine Aggregate ◽  
Waste Concrete

Fine aggregate can be extracted from waste concrete by series of processing. The recycled fine aggregate can then be utilized to manufacture recycled fine aggregate mortar (RFAM) or recycled fine aggregate concrete (RFAC). Air entraining agent was added in RFAM to improve its mechanical performance. The influence of the dosage of the air entraining agent on both the compressive and flexural strength of the RFAM was explored after 7 days and 28 days curing. The optimum dosage of the air entraining agent was determined.

Testing Study of FA-ASP Binder Mortar

2013 ◽  
Vol 438-439 ◽  
pp. 72-74
Author(s):  
Huan Qiang Liu ◽  
Yu Ping Tong ◽  
Jin Liang Jin ◽  
Zhen Wang ◽  
Kai Qin ◽  
...  
Keyword(s):  
Fly Ash ◽  
Production Cost ◽  
Mechanical Performance ◽  
Cement Mortar ◽  
Raw Materials ◽  
High Volume ◽  
Development Prospect ◽  
High Volume Fly Ash ◽  
Masonry Mortar

By using high-volume fly ash (FA), aluminum slag superfine powder (ASP) as raw materials to synthesize FA-ASP binder, this paper developed M10 masonry mortar. Comparing with the cement mortar and FA mortar, the FA-ASP mortar has not only good construction performance and mechanical performance, but also reduces the production cost obviously, which is a broad development prospect of green new building mortar.

Sign in / Sign up

Export Citation Format

Share Document