Influence of Rice Husk Ash and Fly Ash on Properties of Red Clay

Abstract

Effects of rice husk ash and fly ash on properties of red clay collected from Naogaon district of Bangladesh were investigated. Different percentages of rice husk ash (RHA) and fly ash (5%, 10% and 15%) were thoroughly mixed with clay to analyse various physical and chemical properties of clay followed by heat treatment of 800 0 C to 1100 0 C. The samples were tested for compressive strength, linear shrinkage, water absorption, porosity and bulk density. XRD analysis indicates the clay sample was mainly illite type. Water absorption and porosity increased with increasing percentage of ashes. The percentage of water absorption was within 6 to 10% for different mixture which may be suitable for ceramic and tiles purposes. Both fly ash and RHA of 15% could be used to improve some properties of clay. The optimum firing temperature for all the samples was 1050 0 C. XRD pattern of clay with fly ash and rice husk ash heated at 1050 0 C confirms the presence of feldspar and quartz as major phase and hematite (Fe 2 O 3 ) and cristobalite phase as minor phase. This red clay deposits reinforced with different appropriate quantities of rice husk ash and fly ash could be used for various low temperature applications in industry and construction purposes.

Recycling of Olive Pomace Bottom Ash (by-Product of the Clay Brick Industry) for Manufacturing Sustainable Fired Clay Bricks

“…In fact, the porosity of reference brick fired at 950 °C was 23.2% and reach 26% when 30% of bottom ash is added. Casa et Castro [16], alongside other studies [16,18,40,45], confirmed that the addition of biomass ashes decrease the bulk density of fired brick samples. These finding are encouraging for construction material industry, as it produced lightweight materials requiring less energy for transportation and to lift them to the higher floors, which can reduce the cost of construction.…”

“…3. The mass loss observed from 650 °C to 900 °C could be explained by the dissociation of calcite with the elimination of CO 2 [40][41][42]. This can be confirmed by the XRF analysis that confirms the presence of a large amount of CaO (Table 2).…”

“…Table 3 represent Atterberg's limits of the raw clay sample. The results show that Bensmim sample has weak plasticity due to its low plastic index (Ip = 15%) [40]. Knowing that the plastic limit of illite is 24.75 and its liquid limit is 35.9, the plasticity index is then equal to 11.15.…”

Assessment of Effect of Rice Hush Ash on Burnt Properties of Badeggi Clay.

“…Table 4, imply that more inert additives could be accommodated for molding purposes and bests other clays by various researchers. Naogaon -Bangladesh clay with a plasticity index of 13%, by [9], Ibaji clay with 20.1% plasticity by [4] and Oboro clay 23% as reported by [7]. Their values all fall below the plasticity index of Badeggi Clay, corresponding to 46% Liquid limit, shown in Figure 2.…”

Pengaruh Penambahan Pelepah Kelapa Sawit Sebagai Bahan Campuran Terhadap Sifat Mekanik Kuat Tekan Dan Porositas Batu Bata

“…Karena ikatan antar pelepah lebih lemah dari ikatan tanah liat dengan pelepah kelapa sawit, sehingga ketika persentase penambahan pelepah kelapa sawit diperbanyak lagi maka ikatan antar pelepah akan semakin banyak menyebabkan batu bata rapuh. Selain itu, juga bisa disebabkan kandungan senyawa kimia Al2O3 pada tanah liat yang sedikit akibat tanah liat dicampur dengan pelepah kelapa sawit, dimana senyawa kimia alumina ini hanya terdapat pada tanah liat.Alumina (Al2O3) berfungsi sebagai perekat, semakin banyak penambahan pelepah kelapa sawit maka pelepah kelapa sawit tersebut menjadi sampah bukan lagi sebagai zat aditif karena alumina tidak dapat lagi berfungsi sebagai perekat(Sultana et al, 2014).Penelitian Ratih (2018) yang mengatakan bahwa pada komposisi abu sekam padi 10% mempunyai kuat tekan sehubungan dengan hal tersebut komposisi campuran batu bata perlu diperhatikan untuk kekuatan bangunan. 3,3 N/mm 2 ; terjadi penurunan kuat tekan batu bata yang disebabkan karena adanya ikatan yang tidak sempurna, yaitu ikatan antar abu itu sendiri.KESIMPULANKomposisi perlakuan pelepah yang terbaik untuk pembuatan batu bata adalah T2 (10%) dengan porositas 18,4% dan kuat tekan 20,5 NM/cm 2 dan memenuhi standar kualitas batu bata.…”