scholarly journals Study on the Application of Recycled Fine Powder in Ready-Mixed Concrete

2019 ◽  
Vol 278 ◽  
pp. 01010
Author(s):  
Lan Cong ◽  
Lu Jialin ◽  
Chen Jing ◽  
Wu Hailun ◽  
Liu Dong
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Fine Powder ◽  
Recycled Concrete ◽  
Obvious Effect ◽  
Brick Powder ◽  
Working Performance ◽  
Surfactant Composition ◽  
Ready Mixed Concrete

The basic properties of the fly ash, recycled brick powder and recycled concrete powder, compared the recycled brick powder and recycled concrete powder instead of fly ash in concrete preparation, influence on the working performance and mechanical properties; and through the modifier to improve the concrete slump loss is too large, analyzes the mechanism of change influence of modifiers on mechanical properties of concrete. The results showed that the recycled brick powder and recycled concrete powder in certain fineness conditions, its performance with fly ash; retarder, activator and some surfactant composition modifier has obvious effect on the working performance and mechanical properties; and hydration calcium silicate aluminum increased the role of large the mechanical properties of concrete.

scholarly journals Characterization and Performance of Mechanical Properties of GGBS Based Geo Polymer Mortars

2019 ◽  
Vol 8 (4) ◽  
pp. 8336-8342
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Construction Industry ◽  
Research Paper ◽  
Setting Times ◽  
And Performance ◽  
Creep And Shrinkage

From decades it has been recognized that Geopolymer will considerably replace the role of cement in the construction industry. In general, Geopolymer exhibits the property of the peak compressive strength, minimal creep and shrinkage. In this current research paper, Geopolymer mortar is prepared by using GGBS and Fly ash. The mix proportions are of (100-60)%GGBS with Fly ash by 10% replacement. The alkali activators Na0H and Na2Sio3 are used in the study for two different molarities of 4&8. The ratio to Sodium silicates to sodium hydroxide is maintained from 1.5, 2, 2.5 & 3 were used. Mortars are prepared and studied the effect of molarities of alkali activators in their setting times and strengths

Experiment and Mechanism Study on Effect of Water/Binder and Fly Ash on Mechanical Properties of HPC

2011 ◽  
Vol 255-260 ◽  
pp. 3404-3410
Author(s):  
Shuang Xi Li ◽  
An Quan Xu ◽  
Xin Jun Tang ◽  
Quan Hu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Concrete Strength ◽  
Early Period ◽  
Point Of View ◽  
Mechanism Study ◽  
Compressive Strength Test ◽  
Large Water

It takes on the technical and economic double benefits that fly ash taking the place of cement. However, water/binder of modern concrete is generally low; the research on the concrete performance which is based on large water/binder is no longer suitable for analysis of modern concrete. As to this problem, using different proportions of W/B and FA dosage as influencing factors, specimen is compounded for the compressive strength test. Then, mechanical properties of HPC are studied systematically. Based on this, macro-performance is analyzed from a micro-mechanism point of view through taking the electron micrograph. As the study shows, strength of HPC mixed with fly ash has low characteristics at early period while high ones at later period. At later hydration, fly ash effect plays a significant role, the growth rate of concrete strength increases as the increase of FA dosage. Compressive strength of concrete decreases as the increase of W/B and FA dosage. When the W/B is high, compressive strength is not sensitive to the change of W/B and FA dosage; but when the W/B decreases from 0.30 to 0.25, the concrete strength transition occurs. The influence of W/B on concrete compressive strength is more significant than that of the FA dosage; in the preparation of HPC, fly ash can be added more and cement is added less relatively by decreasing the W/B, displaying the role of micro-aggregate filling and modification, improving the strength and other performance of concrete. The study on micro-mechanism proves well the macro-phenomena above.

Enhancement of mechanical properties of fly ash geopolymer containing fine recycled concrete aggregate with micro carbon fiber

2021 ◽  
pp. 102403
Author(s):  
Peem Nuaklong ◽  
Ampol Wongsa ◽  
Kornkanok Boonserm ◽  
Chanchai Ngohpok ◽  
Pitcha Jongvivatsakul ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Carbon Fiber ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate

scholarly journals Combined Economic and Mechanical Performance Optimization of Recycled Aggregate Concrete with High Volume of Fly Ash

2018 ◽  
Vol 8 (7) ◽  
pp. 1189 ◽  
Author(s):  
Rawaz Kurda ◽  
Jorge de Brito ◽  
José Silvestre
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Mechanical Characteristics ◽  
High Volume ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Strength Development ◽  
Economic Point ◽  
The Cost

This study intends to evaluate high and low-strength concrete mixes made with high volume of fly ash (FA) and recycled concrete aggregates (RCA) from both a mechanical and economic point of view. For this purpose, the mechanical characteristics of concrete, namely compressive strength (fcm), splitting tensile strength (fctm), and modulus of elasticity (Ecm) were correlated with the cost of 1 m3 of concrete mixes, taking into account the most common scenarios (e.g., cost of the raw materials, transportation between supplier and concrete plant, and mixing procedure) in the centre of Portugal. The results show that the incorporation of FA and RCA are detrimental to the mechanical properties of concrete. Ecm is predominantly influenced by RCA, and “fcm” and “fctm” are mainly controlled by FA incorporation. However, after a given age, the rate of the strength development (fcm, fctm and Ecm) of RCA concrete containing FA significantly accelerates over time relative to the reference concrete (without FA and RCA) and to the mixes made with either RCA or FA. Furthermore, the cost of concrete does not significantly change by incorporating RCA. The use of superplasticizer (SP) significantly increases the cost of concrete. However, the higher cost of concrete due to the use of SP can be offset by replacing cement with FA. Regarding the optimization process, concrete mixes with the lowest cost may not necessarily be the optimum choice regarding cost efficiency. In fact, the mechanical properties of concrete also need to be considered to aid the decision on the optimal concrete mix. Finally, the results show that the optimum mixes in terms of cost and mechanical characteristics are mostly the ones made with simultaneous incorporation of RCA, FA, and SP, rather than with their individual incorporation.

scholarly journals Mechanical Properties of Recycled Aggregate Self-Compacting High Strength Concrete Utilizing Waste Fly Ash, Cellular Concrete and Perlite Powders

2019 ◽  
Author(s):  
Mohammed Abed ◽  
Rita Nemes
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Partial Replacement ◽  
Powder Materials ◽  
Strength Concrete ◽  
Cellular Concrete

The sustainability of engineering products has become a basic requirement instead of a mere choice because the harmony between economic activity and the earth’s ecosystem must be seriously considered. The influence of using three unprocessed waste powder materials as cement replacing materials (CRMs) and/or coarse recycled concrete aggregate (RCA) as a partial replacement of coarse natural aggregate (NA) on fresh and mechanical properties of self-compacting high-strength concrete (SCHSC) is investigated in this study. The activation index of the CRMs on the cement paste is tested as an initial step. The CRMs, namely, waste fly ash (WFA), waste perlite powder (WPP) and waste cellular concrete (WCC), are tested through 21 mixtures allocated by seven different series with three mixes of each. The mechanical properties of the 21 concrete mixes are determined after one, three and nine months of curing. Results of compressive strength, splitting tensile strength, flexural strength and modulus of elasticity are presented. This work shows that the mechanical and environmental performance of SCHSC can be improved by the replacement of NA by RCA of up to 50% and the replacement of cement by WPP or WFA of up to 15%. Using WCC is not recommended to be reached 15% and using WFA is preferable to be with incorporating RCA rather than NA alone. Findings indicate that incorporating waste materials can be valuable in SCHSC, thereby potentially leading to an increasingly green environment and paving the way for advancements in sustainable construction.

scholarly journals Mechanical Properties of Aluminum/fly Ash Composites Produced by Hot Extrusion

2010 ◽  
Vol 7 (1) ◽  
pp. 95-100 ◽  
Author(s):  
Subarmono. Subarmono ◽  
Jamasri. Jamasri ◽  
M. W. Wildan ◽  
Kusnanto. Kusnanto
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Wear Rate ◽  
Vickers Hardness ◽  
Bending Strength ◽  
Aluminum Matrix ◽  
Fine Powder ◽  
Hot Extrusion ◽  
Aluminum Matrix Composites ◽  
Green Body

This research aims to investigate mechanical properties of aluminum matrix composites reinforced with fly ash (AMC/Fly ash) produced using hot extrusion.AMC/Fly ash was prepared from aluminum fine powder as matrix and fly ash as reinforcement. The various amount of fly ash of 5%; 7.5%; 10%; 12.5% and 15% wt were added to the aluminum fine powder. Each composition was mixed using rotary mixer for 3 hours. The mixture was compacted using uniaxial pressing with a pressure of 100 MPa to produce green body. The green body was hot extruded with an extrusion ratio of 0.25 and temperature of 600ºC. Bending strength, Vickers hardness, wear rate and porosity of the AMC/fly ash were measured. The microstructure was observed using SEM. The results show that mechanical properties of the composites such as bending strength and Vickers hardness increase, porosity and wear rate decrease with increasing fly ash content up to 12.5 wt %. Above 12.5 wt % of fly ash those mechanical properties of composites seems to be inverse. The properties of AMC/12.5 wt % fly ash produced using hot extrusion from green body showing the best properties in term of the bending strength, Vickers hardness, porosity and wear resistance, that are 302 MPa; 79 VHN; 0.73 % and 0,0095 mg/(MPa.m), respectively.

Effect of Polymer Content to Mechanical Properties of Fly Ash Slurry

2011 ◽  
Vol 399-401 ◽  
pp. 1230-1233
Author(s):  
Yue Zhong Lin
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Polymer Content ◽  
Lower Intensity ◽  
Dosage Strength ◽  
Low Dosage

In this paper, different polymer dosage in case of mechanical properties of fly ash slurry, through testing studies have shown that low-dosage strength of fly ash slurry has increased the role of high-dosage resulting in lower intensity, but the overall pressure off than reduced, improving the flexibility of fly ash cement, is it has a certain flexibility.

The Research and Application of Airport Pavement Recycled Concrete

2014 ◽  
Vol 525 ◽  
pp. 465-468 ◽  
Author(s):  
Xiao Jun Liu ◽  
Chen Fei Zhu ◽  
Yong Gen Wu ◽  
Qing Tao Liu
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
High Efficiency ◽  
Recycled Concrete ◽  
Concrete Research ◽  
Recycled Aggregates ◽  
High Quality ◽  
Waste Concrete ◽  
Airport Pavement

The overhauling, rebuilding and enlarging of airport pavement often produce vast waste concrete. Use of these concrete as recycled aggregates, make recycled concrete. And by adopting the “double-mixed” technique with high quality fly ash and high efficiency admixture, optimizing the mix proportions design of pavement recycled concrete, research its mechanical properties and verify its application effect.

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