Examination of the mechanical properties and failure pattern of soilcrete mixtures modified with rice husk ash (original) (raw)
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Strength of Blended Cement Soilcrete Containing Afikpo Rice Husk Ash and Saw Dust Ash
International Journal of Engineering Research and Development e-ISSN: 2278-067X, Volume 7, Issue 2, 2013
This study investigated the compressive strengths of soilcrete produced from blended cements made of Ordinary Portland Cement (OPC), Afikpo rice husk ash (RHA), and sawdust ash (SDA). 135 soilcrete cubes of 150mm x 150mm x 150mm were produced with OPC-RHA binary blended cement, 135 with OPC-SDA binary blended cement, and 135 with OPC-RHA-SDA ternary blended cement, each at percentage OPC replacement with pozzolans of 5%, 10%, 15%, 20%, and 25%. Three cubes for each percentage replacement of OPC with pozzolan and the control were tested for saturated surface dry bulk density and crushed to obtain their compressive strengths at 3, 7, 14, 21, 28, 50, 90, 120, and 150 days of curing. The 150-day strength values for OPC-RHA binary blended cement soilcrete were 10.50N/mm 2 for 5% replacement, 10.30N/mm 2 for 10% replacement, 10.10N/mm 2 for 15% replacement, 10.00N/mm 2 for 20% replacement, and 9.80N/mm 2 for 25% replacement; values for OPC-SDA binary blended cement soilcrete were 10.10N/mm 2 for 5% replacement, 9.90N/mm 2 for 10% replacement, 9.70N/mm 2 for 15% replacement, 9.50N/mm 2 for 20% replacement, and 9.50N/mm 2 for 25% replacement; values for OPC-RHA-SDA ternary blended cement soilcrete were 10.30N/mm 2 for 5% replacement, 10.10N/mm 2 for 10% replacement, 9.90N/mm 2 for 15% replacement, 9.80N/mm 2 for 20% replacement, and 9.60N/mm 2 for 25% replacement; while the control value was 8.70N/mm 2. This shows that OPC-RHA and OPC-SDA binary blended cements as well as OPC-RHA-SDA ternary blended cement could all be used in producing soilcrete with sufficient strength for building and civil engineering works.
Strength of Blended Cement Soilcrete Containing Afikpo Rice Husk Ash and Saw
2014
ABSTRACT: This study investigated the compressive strengths of soilcrete produced from blended cements made of Ordinary Portland Cement (OPC), Afikpo rice husk ash (RHA), and sawdust ash (SDA). 135 soilcrete cubes of 150mm x 150mm x 150mm were produced with OPC-RHA binary blended cement, 135 with OPC-SDA binary blended cement, and 135 with OPC-RHA-SDA ternary blended cement, each at percentage OPC replacement with pozzolans of 5%, 10%, 15%, 20%, and 25%. Three cubes for each percentage replacement of OPC with pozzolan and the control were tested for saturated surface dry bulk density and crushed to obtain their
An investigation of rheological properties of cement-based grout mixed with rice husk ash (RHA)
This paper investigates the fluidity and rheological properties of the cement based grout mixed with rice husk ash (RHA). The experimental program consisted of fifteen different mixture having 5%, 10%, 20%, and 30% RHA content and three different water to binder ratios (w/b = 0.75%, 1.00%, and 1.25%). Workability properties (marsh cone flow time, plate cohesion, and mini slump diameter), plastic viscosity, apparent viscosity, and the yield stress of the mixtures were determined. Test results showed that increasing replacement level for the RHA amount increases marsh cone flow time, plate cohesion, plastic and apparent viscosity, and the yield stress, but also decreases mini slump diameter. Shear thickening and pseudo-plastic behavior was observed for high RHA content for w/b ratios greater than 1.00.
Fresh Properties of Cementitious Grout with Rice Husk Powder
This paper reports the results of a study conducted to investigate the effects of rice husk powder (RHP) on the rheological properties and the fluidity of grout mixtures. The experiments were carried out with the grout mixtures including of 4, 8, 12, 16 and 20% content of RHP and 0.75, 1.00, 1.25 and 1.50 ratios of water–cement. The purpose of the study is to provide a new knowledge about using RHP as a filler in cement grouts in order to improve the grout methods and services, and achieve a good product performance. Test results showed that the increase in RHP content in the mix increases the plastic viscosity with all water–cement ratios. At 0.75, 1.00 and 1.25 ratios of water–cement, the grout mixtures showed shear-thinning behavior. On the other hand, this behavior changes to shear-thickening behavior at w/c = 1.50 at all RHP percentages. Experimental results indicated that this waste product can be utilized as a filler in cement grout for geotechnical application such as filling large voids.
Characterization of flat sheet cement containing rice husk ash
2007
Rice husk ashes (RHA) from two local sources, Mahaphant Fibre-Cement Public Co., Ltd. (crystalline SiO2 as cristobalite) and A.T. Bio Power Co., Ltd. (amorphous SiO2), were characterized for chemical composition and mineral phases by XRF and XRD, respectively. Then 10-25 wt% of RHA were mixed with Portland cement (Type I), sand, water and plasticizer to form into 2-in cubes of mortar. After wet curing (3-28 d) the specimens were tested for compressive strength and morphologies of the hydrates were observed by SEM. Although the water demand to attain normal consistency increased with the content of RHA, it was found that the strengths of A.T. Bio Power RHA added cement mortars were respectively higher than those of reference cement mortars (Portland cement type I : sand : water) and Mahaphant RHA added cement mortars at all curing ages. The highest compressive strength obtained at 28 d was from 20 wt% A.T. Bio RHA added cement mortars. This suggested the optimal content of RHA be 15-...
The fluidity and rheological properties of the grout mixtures treated with rice husk powder (RHP) were studied. The experimen ts were done by using different RHP content (%4, %8, %12, %16 and %20 respectively) with cement grouts proportioned with different water to cement ratio (0.75, 1.00, 1.25 and 1.50). This experiment aims to help contribute to the industry in saving the environmen t, to encourage the municipality to find solutions regarding the disposal to landfills of waste materials and save the environment, to provide new knowledge to the contractors and developers on how to improve the grout methods and services by using rice husk, and to sustain good product performance and meet recycling goals. Observations from the tests performed were conducted in the laboratory where precise data were gathered and completely attained.
A Study on Compressive Strength of Cement with Rice Husk ASH
In this Research work ,the investigation was carried to find the effect of partial substitution of cement by rice husk ash (RHA) in proportion starting from 15% mix together in concrete by substitution of cement with the moderate increase of RHA 5%, last proportion was taken 15% RHA .The test on hardened concrete were destructive in nature which includes compressive test on cube for size (150*150*150) at 3,7 and 28 days of curing done as per IS 10269 2009,the work performed in this research reports the effect on the behavior of concrete produced from cement with RHA at different proportion on the mechanical properties of concrete such as compressive strength. Investigation reported that compressive strength increases by 32% were obtained at different combinations at 5% ,10% and 15% RHA partial replacement of RHA produces the environmental effects , so this replacement is ecofriendly and improves its strength.
Influence of the initial setting of cement on the shear strength of rice husk ash stabilised soil
Journal of Agricultural Engineering
Determination of soil shear strength is essential for engineering construction. Using rice husk ash (RHA) with cement in the soil is a potential ground improvement technique that can reduce environmental problems and construction budget. In the present study, ten combinations of soil-RHA-cement were investigated to understand the effects of RHA with cement on the shear strength parameters of the soil. The admixtures were prepared by taking soil with 5%, 10%, 15% RHA, and 2%, 4%, and 6% cement. All specimens of soil-RHA-cement were tested after the initial setting of cement. The direct shear test was set up to compare different soil-RHA-cement mixtures under three normal stresses of 40, 60, and 80 kPa. The test results showed the difference in each mixture’s shear stress-shear displacement relationship, shear displacement- vertical displacement relationship, shear stress-normal stress relationship, shear strength, cohesion, and internal friction angle. According to the findings, shea...