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A comparative study on compressive strength of SCC between stone chips and brick chips as coarse aggregate

A comparative study on compressive strength of SCC between stone chips and brick chips as coarse aggregate

M. A. Alam*, M. R. Islam, R. A. Rimi, M. S. Hossain, M. M. Rana

HIGHLIGHTS

  • Compressive strength of SCC made with stone chips and brick chips as coarse aggregate is studied.
  • Compressive strength of SCC for different mixed ratios at different ages of concrete is obtained.
  • Average slump flow value of SCC made with stone chips is higher than brick chips.
  • Compressive strength of SCC made with stone chips is higher than brick chips.
  • Stone chips are highly recommended to use as coarse aggregate in SCC.

ABSTRACT

The self-compacting concrete (SCC) is a high-performance concrete in which the utilization of vibration or compaction no more required. The aim of this study is to investigate the compressive strength of SCC obtained from stone chips and brick chips as coarse aggregate and find out which aggregate is better in compressive strength. For experimental setup, two types of coarse aggregates are used in this study; stone chips and brick chips. Sylhet sand is used as fine aggregate. Water cement ratio 0.4% and polycarboxylic ether 1% as super plasticizer are used by weight of cement. Moreover, two types of mix ratios namely 1:1:2 and 1:2:4 are used by volume. All cylindrical specimens (Diameter = 100 mm and height = 200 mm) are tested at the age of 7, 14 and 28 days. It is observed that the slump flow value and the compressive strength of SCC made with stone chips are higher than that of brick chips as coarse aggregate. Based on the tested results, stone chips are highly recommended to use as coarse aggregate in SCC as it provides better compressive strength.

© 2020 Ababil Publishers. All rights reserved.

To cite this article: Alam MA, Islam MR, Rimi RA, Hossain MS, Rana MM. A comparative study on compressive strength of SCC between stone chips and brick chips as coarse aggregate. Journal of Advanced Civil Engineering Practice and Research 2020;11:21-24.

To link this article: http://ababilpub.com/download/jacepr11-4/

Mechanical properties and direct tensile strength of waste toner foamed concrete

Mechanical properties and direct tensile strength of waste toner foamed concrete

N. M. Alkurdi*, F. A. Mohammad, H. A. Klalib

HIGHLIGHTS

  • Cement content effect on the compressive strength of FC is examined.
  • Effect of density and additives on FC mechanical properties is investigated.
  • A direct tensile test to determine the tensile strength of FC is proposed.
  • Direct tensile strength is compared with the indirect ones.
  • Modulus of elasticity and stress-strain relationship of FC is obtained.

ABSTRACT

The use of Foamed Concrete (FC) in structural elements reduces dead loads on structures and foundations, contributes to cost reduction and energy-efficient construction by reduces the structural elements size, labour and energy during transportation and construction stages. To investigate the mechanical properties of FC including compressive, tensile and flexural strengths, modulus of elasticity and the stress-strain relationship, 256 specimens classified into four different densities (1200, 1400, 1600 and 1800 kg/m3) were tested. For each concrete density, four mixes were designed including control mix and three different additives; silica fume, metakaolin and waste toner. The waste toner additive was collected from used printer cartridges. The experimental program was considered to introduce a modified direct tensile test, where splitting and flexural tests were conducted to confirm its reliability. The obtained results were quite converged, which illustrated that the tensile strength determined by the proposed model was lower than that of the Brazilian and flexural tests. The waste toner additive improved the FC compressive and tensile strengths by more than 30%. These results are promising and point to the significant potential of developing an eco-friendly lightweight concrete by replacement a percentage of cement with waste toner.

© 2020 Ababil Publishers. All rights reserved.

To cite this article: Alkurdi NM, Mohammad FA, Klalib HA. Mechanical properties and direct tensile strength of waste toner foamed concrete. Journal of Advanced Civil Engineering Practice and Research 2020;11:10-20.

To link this article: http://ababilpub.com/download/jacepr11-3/

Performance of biochar prepared from municipal solid waste for removal of methylene blue dye

Performance of biochar prepared from municipal solid waste for removal of methylene blue dye

M. Jadhav1*, S. Kadam2

HIGHLIGHTS

  • Ample quantity of color wastewater produced due to application of dyes.
  • Biochar is an activated carbon prepared from municipal solid waste.
  • Biochar is a cost effective adsorbent used for removal of dyes from wastewater.
  • Adsorption isotherm modeling was done using various models.
  • Adsorption is proved to be the most effective method of dye removal.

ABSTRACT

Dye is a substance used to impart color to textiles, papers, leathers, foods, plastics and cosmetics. Plenty of color wastewater is produced due to application of dyes. This wastewater discharged from these industries poses certain hazards and environmental problems. The objective of this study is to remove methylene blue (MB) dye by biochar (activated carbon) prepared from municipal solid waste. Adsorption of MB dye was performed by using both batch as well as fixed bed column study. The effect of various parameters viz. adsorbent dose, pH, stirring rate, dye concentration and contact time on adsorption of MB dye was studied in batch mode and that of dye concentration; pH and flow rate was studied in fixed bed column mode. Batch study concluded that increase in adsorbent dose increases the removal efficiency of MB dye due to increase in available surface area for adsorption, also increase in initial concentration of dye decreases the removal efficiency. The MB dye adsorption was also affected by pH and other process parameters. Maximum removal efficiency was observed at dose of 400 mg (95.2%), with initial dye concentration 50 mg/l (90%) at pH value 4 (22.94%) with 2 hours (98.79%) of contact time at 120 rpm (99.82%). Adsorption isotherm modeling was done using Langmuir, Freundlich, Temkin and Redlich Peterson models, where the experimental data was better fitted to the Redlich Peterson model than other three models. Redlich Peterson model showed the best fit with coefficient of determination (R2 = 1) equal to unity. The data of batch study was used for continuous fixed bed column study. This study concluded that at low flow rate and low dye concentration maximum removal of dye was observed. pH played a vital role in removal efficiency of MB dye and maximum removal was observed at pH = 7.

© 2020 Ababil Publishers. All rights reserved.

To cite this article: Jadhav M, Kadam S. Performance of biochar prepared from municipal solid waste for removal of methylene blue dye. Journal of Advanced Civil Engineering Practice and Research 2020;11:2-9.

To link this article: http://ababilpub.com/download/jacepr11-2/

Energy dissipation-based arc-length method for nonlinear response prediction

Energy dissipation-based arc-length method for nonlinear response prediction  

Md. Alhaz Uddin

The nonlinearity induced by the large deformation or material nonlinearity or both responses is manifested in the form of nonlinear load-deflection curves. These curves can have a descending branch after attaining the peak load due to the strain-softening behaviour of materials in its inelastic range. The solution of this typical nonlinear finite element problem is quite challenging and a load control-based technique cannot trace the descending branch of the load-deflection curve. In order to overcome this problem, a displacement control-based technique may be used; however, this will also fail if the load-deflection curve has a snap-back response. In this situation, an arc-length based solution technique seems to be the only possible option…

© 2020 Ababil Publishers. All rights reserved.

To cite this article: Uddin MA. Energy dissipation-based arc-length method for nonlinear response prediction. Journal of Advanced Civil Engineering Practice and Research 2020;11:1.

To link this article: http://ababilpub.com/download/jacepr11-1/