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Characterization of Nanocomposite Mixture Polyvinyl Alcohol and Rice Husk Ash

100%

Sirait M. , Sinulingga K. , Siregar N.

tom Vol. 24, nr 11

268–-273

Rice husk ash (RHA) nanoparticles were prepared to be applied as a filler in the formation of Polyvinyl Alcohol (PVA) nanocomposites. The manufacture of rice husk ash nanoparticles involved the Ball Mill method and the coprecipitation method, while the manufacture of Polyvinyl Alcohol nanocomposite membranes and rice husk ash was carried out by the sol-gel method. The results of XRD analysis using Match software indicated that the crystal structure of rice husk ash is monoclinic with a particle size of 16.55 nm. The mechanical test results obtained the largest elastic modulus of 29.28 MPa in 3% rice husk ash mixture, the largest tensile test of 8.83 MPa in 1% rice husk ash mixture, and the largest elongation at break of 82.08% in 4% rice husk ash mixture. The addition of rice husk ash as a filler can improve the mechanical properties of PVA/rice husk ash nanocomposites.

Utilization of recycle paper mill residue and rice husk ash in production of light weight bricks

72%

Raut S. , Ralegaonkar R. , Mandavgane S.

tom Vol. 13, no. 2

269--275

Resource recovery and utilization of industrial by-product materials for making construction material has gained significant attention across the world. In this research study, recycle paper mill residue (RPMR) and rice husk ash (RHA) are utilized to improve the properties of bricks. This research study evaluated the feasibility of utilizing RPMR and RHA for making construction bricks. A homogeneous mixture of RPMR–RHA–cement was prepared with varying amount of RHA (10–20% by weight) and RPMR (70–80% by weight) and tested in accordance with the IS codes. Characterization of RPMR and RHA was performed using XRF, TG-DTA, XRD and SEM techniques. The SEM monographs show that RPMR has a porous and fibrous structure. The TG-DTA characterization demonstrated that RPMR can withstand temperatures up to 280 °C. The results indicate that RPMR-bricks prepared from RPMR–RHA–cement combination are light weight and meet compressive strength requirements of IS 1077-1992. This novel construction material serves objectives of resource recovery through prudent solid waste management.

Partial replacement of cement with rice husk ash in concrete production: an exploratory cost-benefit analysis for low-income communities

72%

Muleya F. , Muwila N. , Tembo C. K. , Lungu A.

tom Vol. 13, no. 3

127--141

Cement is an important construction material in concrete production; however, it is expensive and unaffordable for many low-income and rural communities in developing countries. Rice husk is a by-product from the rice mill process, with an approximate ratio of 200 kg rice husk per one tonne of rice produced. This experimental study aimed to investigate the integrity of concrete produced in Zambia using rice husk ash (RHA) to partially replace cement. The primary goal was to carry out a cost–benefit analysis on the use of RHA in concrete. RHA was used to partially replace cement with ratios of 10 %, 20 % and 30 %. The 20 % cement replacement mix produced the optimum 18 MPa concrete strength results at a 0.5 water/binder ratio. This translated in cost reduction of concrete by 12.5 %, which is particularly significant for higher concrete volumes. The produced concrete is suitable for lightly loaded structures, such as foundation footings, surface beds and walkways to benefit low-income communities. The study further concluded that the RHA based concrete was more cost-efficient in structures that were close to areas of rice production due to reduced RHA transportation costs.

Bond strength of concrete-filled hollow section with modified fibrous foamed concrete

51%

Khairuddin S. A. A. , Rahman N. A. , Jamaluddin N. , Jaini Z. M. , Elamin A. , Rum R. H. M.

2020

tom Vol. 66, nr 3

97--108

The concrete-filled section of columns has been widely in construction used due to its structural elements. As a result, the usage of composite columns has recently increased all over the world. However, using foamed concrete alone does not result in much improvements in strength. Therefore, this paper examines the use of foamed concrete containing fibre to improve the strength of composite columns. Specifically, this study aims to determine the bond strength of concrete-filled hollow section (CFHS) with modified fibrous foamed concrete. Two types of fibre are used in this work, namely, steel fibre and polypropylene fibre, with rice husk ash (RHA) as a sand replacement to improve the compressive strength of foamed concrete. The CFHS with modified fibrous foamed concrete is tested by using the push-out method, and the results show that CFHS with steel fibre has a highest bond strength.