Application of lightweight aggregate and rice husk ash to incorporate phase change materials into cementitious materials

In this paper, a kind of RHA-paraffin phase change material was prepared, and the SEM was used for observing its internal morphologies, DSC analysis was carried out for detecting its temperature and enthalpy of phase transition. The results showed that rice husk ash have a greater absorption rate for paraffin; a large number of pores of the RHA were filled by paraffin in the RHA-paraffin phase change material, and the absorption rate can reach 53.5%.

Download Full-text

Assessment of Workability and Compressive Strength of Rice Husk Ash-Blended Palm Kernel Shell Concrete

LAUTECH Journal of Civil and Environmental Studies ◽

10.36108/laujoces/1202.70.0101 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

K. O. Oriola

Keyword(s):

Compressive Strength ◽

Rice Husk ◽

Rice Husk Ash ◽

Construction Materials ◽

Palm Kernel ◽

Lightweight Aggregate ◽

Strength Properties ◽

Lightweight Aggregate Concrete ◽

Palm Kernel Shell ◽

Compressive Strength Of Concrete

The evaluation of agro-industrial by-products as alternative construction materials is becoming more significant as the demand for environmentally friendly construction materials increases. In this study, the workability and compressive strength of concrete produced by combining Palm Kernel Shell (PKS) and Rice Husk Ash (RHA) was investigated. Concrete mixes using a fixed content of 15% RHA as replacement for cement and 20, 40, 60, 80 and 100% PKS as replacement for crushed granite by volume with the mix ratios of 1:1½:3, 1:2:4 and 1:3:6 were produced. The water-to-cement ratios of 0.5, 0.6 and 0.7 were used for the respective mix ratios. Concrete without PKS and RHA served as control mix. The fresh concrete workability was evaluated through slump test. The concrete hardened properties determined were the density and compressive strength. The results indicated that the workability and density of PKSC were lower than control concrete, and they decreased as the PKS content in each mix ratio was increased. The compressive strength of concrete at 90 days decreased from 27.8-13.1 N/mm2, 23.8-8.9 N/mm2and 20.6-7.6 for 1:1½:3, 1:2:4 and 1:3:6, respectively as the substitution level of PKS increased from 0-100%. However, the compressive strength of concrete increased with curing age and the gain in strength of concrete containing RHA and PKSC were higher than the control at the later age. The concrete containing 15% RHA with up to 40% PKS for 1:1½:3 and 20% PKS for 1:2:4 mix ratios satisfied the minimum strength requirements for structural lightweight aggregate concrete (SLWAC) stipulated by the relevant standards. It can be concluded that the addition of 15% RHA is effective in improving the strength properties of PKSC for eco-friendly SLWAC production..

Download Full-text

Critical aspects in the handling of reactive silica in cementitious materials: Effectiveness of rice husk ash vs nano-silica in mortar dosage

Construction and Building Materials ◽

10.1016/j.conbuildmat.2019.07.023 ◽

2019 ◽

Vol 223 ◽

pp. 360-367 ◽

Cited By ~ 5

Author(s):

M. Torres-Carrasco ◽

J.J. Reinosa ◽

M.A. de la Rubia ◽

E. Reyes ◽

F. Alonso Peralta ◽

...

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Cementitious Materials ◽

Nano Silica ◽

Reactive Silica ◽

Critical Aspects

Download Full-text

MECHANICAL AND DURABILITY CHARACTERISTICS OF GGBS DOLOMITE GEOPOLYMER CONCRETE

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2019.108 ◽

2019 ◽

Vol 6 (1) ◽

Author(s):

Aikot Pallikkara Shashikala ◽

Praveen Nagarajan ◽

Saranya Parathi

Keyword(s):

Fly Ash ◽

Silica Fume ◽

Rice Husk ◽

Rice Husk Ash ◽

Setting Time ◽

Cementitious Materials ◽

Strength Properties ◽

Industrial Wastes ◽

Geopolymer Concrete ◽

By Products

Production of Portland cement causes global warming due to the emission of greenhouse gases to the environment. The need for reducing the amount of cement is necessary from sustainability point of view. Alkali activated and geopolymeric binders are used as alternative to cement. Industrial by-products such as fly ash, ground granulated blast furnace slag (GGBS), silica fume, rice husk ash etc. are commonly used for the production of geopolymer concrete. This paper focuses on the development of geopolymer concrete from slag (100% GGBS). Effect of different cementitious materials such as lime, fly ash, metakaolin, rice husk ash, silica fume and dolomite on strength properties of slag (GGBS) based geopolymer concrete are also discussed. It is observed that the addition of dolomite (by-products from rock crushing plants) into slag based geopolymer concrete reduces the setting time, enhances durability and improves rapidly the early age strength of geopolymer concrete. Development of geopolymer concrete with industrial by-products is a solution to the disposal of the industrial wastes. The quick setting concrete thus produced can reduce the cost of construction making it sustainable also.

Download Full-text

Incorporation of phase change materials in cementitious systems via fine lightweight aggregate

Construction and Building Materials ◽

10.1016/j.conbuildmat.2012.04.042 ◽

2012 ◽

Vol 35 ◽

pp. 483-490 ◽

Cited By ~ 88

Author(s):

A.R. Sakulich ◽

D.P. Bentz

Keyword(s):

Phase Change ◽

Phase Change Materials ◽

Lightweight Aggregate ◽

Cementitious Systems

Download Full-text

Performance investigation and environmental application of basic oxygen furnace slag – Rice husk ash based composite cementitious materials

Construction and Building Materials ◽

10.1016/j.conbuildmat.2016.07.051 ◽

2016 ◽

Vol 123 ◽

pp. 493-500 ◽

Cited By ~ 9

Author(s):

Wenfeng Yang ◽

Yongjie Xue ◽

Shaopeng Wu ◽

Yue Xiao ◽

Min Zhou

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Cementitious Materials ◽

Basic Oxygen Furnace ◽

Environmental Application ◽

Basic Oxygen ◽

Basic Oxygen Furnace Slag ◽

Furnace Slag

Download Full-text

Research progress of rice husk ash in solidified soil

E3S Web of Conferences ◽

10.1051/e3sconf/202129302018 ◽

2021 ◽

Vol 293 ◽

pp. 02018

Author(s):

HAO Tong ◽

LIU Qian ◽

Fa-Guang Leng ◽

Tian-Long Qiao

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Cementitious Materials ◽

Mineral Admixture ◽

Added Value ◽

Research Progress ◽

Utilization Rate ◽

Application Range ◽

High Silicon ◽

Cementing Material

Rice husk ash is a kind of volcanic ash material with high silicon. This also provides a feasibility for rice husk ash as cement-based auxiliary cementing material. China is rich in rice husk resources, and the rice husk ash is stacked. Using rice husk ash (RHA) instead of traditional cementitious materials can effectively solve the environmental pollution caused by the accumulation of rice husk ash. Domestic and international scholar have added rice husk ash as mineral admixture to concrete, but the utilization rate is very low. In order to increase the added value of rice husk ash, the high silicon property of rice husk ash was used to solidify soil. The application range of solidified soil is wide, the requirements for materials are not high, and the functions are different, which can realize the extensive use of rice husk ash. This paper summarizes the literature on comprehensive utilization of rice husk ash at home and abroad, systematically expounds the physicochemical properties and production process of rice husk ash, introduces the application of rice husk ash in solidified soil, and points out the unsolved problems in this field, which provides a direction for the further development.

Download Full-text

Incorporation of Phase Change Materials in Lightweight Aggregate Concrete

WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT ◽

10.37394/232015.2020.16.11 ◽

2020 ◽

Vol 16 ◽

Keyword(s):

Phase Change ◽

Phase Change Materials ◽

Thermal Response ◽

Lightweight Aggregate ◽

Hydration Heat ◽

Lightweight Aggregate Concrete ◽

Thermal Mass ◽

Hardened Concrete ◽

Bioclimatic Design ◽

Pumice Aggregates

An investigation on some methods for the incorporation of phase change materials (PCMs) into concrete and their effect on its properties is presented. PCMs are characterized by high latent fusion heat, which can increase thermal mass of concrete and contribute to the bioclimatic design of buildings. Concrete compositions with different aggregates (limestone, lightweight or their combination), as well as with different PCMs (paraffinic and dodecyl alcohol) were prepared by different incorporation methods (impregnation to lightweight aggregates or immersion of concrete specimens). Properties of fresh and hardened concrete were studied, as well as hydration heat, thermal response and flammability. The results revealed that the selected PCMs do not significantly affect the properties of concrete. Regarding hydration heat, the presence of the PCM in concrete contributes to a decrease of the temperature peak during hydration which also occurs delayed. Thermal response measurements showed that concrete with purely pumice aggregates has a much better thermal behavior than the other two compositions, while the existence of PCM causes large or small increase of concretes heat capacity, in temperature near to each PCM’s melting point. Finally, appropriate application of PCMs is needed in order to moderate the reported effect on concrete’s fire resistance

Download Full-text

Influence of Rice Husk Ash Density on the Workability and Strength of Structural Concrete

European Journal of Engineering Research and Science ◽

10.24018/ejers.2017.2.3.292 ◽

2017 ◽

Vol 2 (3) ◽

pp. 36 ◽

Cited By ~ 1

Author(s):

John Kamau ◽

Ash Ahmed ◽

Fraser Hyndman ◽

Paul Hirst ◽

Joseph Kangwa

Keyword(s):

Compressive Strength ◽

Rice Husk ◽

Water Demand ◽

Rice Husk Ash ◽

Concrete Strength ◽

High Water ◽

Cementitious Materials ◽

Supplementary Cementitious Materials ◽

Hardened Concrete ◽

Structural Applications

Supplementary cementitious materials (SCMs) have been known to improve the properties of fresh and hardened concrete, and at the same time enhance the sustainability of concrete. Rice husk Ash (RHA), is one such material, but has neither been widely studied nor applied in practice. This work investigated the effect of the density of RHA on the workability and compressive strength of fresh and hardened RHA-replaced concrete respectively. Cement was replaced with RHA in concrete by weight (RHA-W) and by volume (RHA-V) at steps of 0%, 5%, 7.5%, 10%, 15%, 20%, 25% and 30%. The 0% replacement was used as the reference point from which performances were measured. Results showed that unlike the characteristic of other established pozzolans, RHA significantly reduced the workability of wet concrete and the rate of compressive strength gain over curing time due to a high water demand that is caused by the increased volume of replaced concrete, which results from its low density. Workability reduced with increased replacement for both RHA-W and RHA-V. Replacements of above 15% were not possible for the RHA-W due to the high water demand. However, replacements of up to 30% were achieved for the RHA-V. RHA-W specimens achieved lower compressive strengths and were observed to gain strength at a lower rate over the 28 to 91-days period of curing compared to RHA-V specimens. This behavior was attributed to the shortage of water that is necessary for the hydration of cement and subsequent pozzolanic reaction, which is the basis of the contribution that is made to the strength and performance of concrete by SCMs. However, the compressive strengths achieved were above the study’s target concrete strength of class C32/40 at 91 days, which is among those classes that are listed as being durable and suitable for structural applications. A conclusion that RHA should supplement cements by volumetric replacement rather than simple substitution by weight was drawn.

Download Full-text