Properties of Mortar Containing Rice Husk Ash at Different Temperature and Exposed to Aggressive Environment

Abstract

The properties of mortar containing rice husk ash at varying temperatures were studied. Three rice husk ash samples were prepared at different temperatures and with various colors, i.e., 600°C (pink), 800°C (grey), and 1000°C (white), all were used for this study. Ordinary Portland cement (OPC), a well known universal binder, was partially replaced with rice husk ash at 10, 15, 20, and 30% by weight of binder. The water to binder ratio (W/B) of the mortar was kept constant at 0.45. The mortars were subjected to seawater or saturated Ca (OH)2 solution. The controlled and exposed mortars were characterized using X-ray diffraction, FTIR spectroscopy and compressive strength test. The results show that the amount of silica present in RHA are varied with burning temperature and colors, approximately in the range of 95 to 97%. White RHA produced higher compressive strength both in seawater and Ca (OH)2 solution. Finally, white RHA with 15% replacement was most suitable to be used as additive in OPC, and showed good potential for use in seawater applications and alkaline environment.

Green Natural Rubber Composites Reinforced with Black/White Rice Husk Ashes: Effects of Reinforcing Agent on Film’s Mechanical and Dielectric Properties

“…In addition, the unburned carbon or loss of ignition value of BRHA and WRHA were found to be about 7.8% and 0.1%, respectively. The color of the rice husk depends on amount of unburned carbon in the ash [ 21 ]; the reported unburned carbon contents of gray-RHA and WRHA were 2.4% and 1.4%, respectively. The product of WRHA from combustion treatment contains higher silica content than BRHA, but the unburned carbon content of WRHA was lower than that of BRHA.…”

“…The strong sharp peaks at 1080 and 1083 cm −1 are attributed to Si–O–Si asymmetric stretching, along with peaks at 796 and 800 cm −1 , which are due to symmetric Si–O–Si stretching and Si–O quartz [ 27 , 28 ]. The main broad peak between 1000 and 1200 cm −1 of WRHA indicates characteristics of amorphous silica [ 21 ]. The FTIR spectrum clearly indicates that functional groups found on NR–B, NR–W, NR–BC and NR–WC are the same as those found on NR, BRHA and WRHA.…”

Palm oil fuel ash as potential green micro-filler in polymer concrete

“…In a well-known case study, carried out by Bakar et al [11], the researchers successfully modified rice husk ash (RHA) by grinding it into eight different fineness categories using a laboratory ball mill filled with porcelain balls. The modified filler had very fine micro-filler which changed its morphology, improved its performance, and significantly elevated the concrete's compressive strength [12,13].…”

Preparation and characterization of rice husk ash filled natural rubber film: effect of cross-linking agents on mechanical and electrical properties

“…In addition, the unburned carbon or loss of ignition value of BRHA, BRHAT and WRHA were found to be about 7.8%, 7.6% and 0.1%, respectively. The color of the rice husk depends on amount of unburned carbon in the ash [72]; the reported unburned carbon contents of gray-RHA and WRHA were 2.4% and 1.4%, respectively. The product of WRHA from combustion treatment contains higher silica content than BRHA and BRHAT, but the unburned carbon content of WRHA was lower than that of BRHA and BRHAT.…”