Hanifi CANAKCI
University of Gaziantep, Civil Engineering, Faculty Member
The present study aimed to discuss the applicability of biotechnologies in geotechnical engineering. For this purpose, a laboratory investigation was performed to investigate the effect of introducing a biomaterial, xanthan gum, on the... more
The present study aimed to discuss the applicability of biotechnologies in geotechnical engineering. For this purpose, a laboratory investigation was performed to investigate the effect of introducing a biomaterial, xanthan gum, on the behaviour of a sand using a direct shear testing apparatus. The factors addressed included the xanthan gum content and time of curing. The experimental data showed that the shear strength of the sand increased as the biological material content increased beyond 1% xanthan gum content. Increases in maximum shear stress of around 14–166% occurred in specimens with 3% xanthan gum content, and around 93–288% occurred in specimens with 5% xanthan gum content. A decrease in maximum shear stress of around of 7–60% occurred in specimens with 1% xanthan gum content. Within the range of parameters covered by the investigation, the principal factors governing the rate of this increase/decrease in maximum shear stress was the xanthan gum content. The impact of curing time was not significant. This report is intended to serve as an additional discussion and comments on the significance of collaboration between biologists and geotechnical engineers.
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Sixty four tests were performed in a steel tank to investigate the axial responses of piles driven into organic soil prepared at two different densities using a drop hammer. Four different pile materials were used: wood, steel, smooth... more
Sixty four tests were performed in a steel tank to investigate the axial responses of piles driven into organic soil prepared at two different densities using a drop hammer. Four different pile materials were used: wood, steel, smooth concrete, and rough concrete, with different length to diameter ratios. The results of the load tests showed that the shaft load capacity of rough concrete piles continuously increased with pile settlement. In contrast, the others pile types reached the ultimate shaft resistance at a settlement equal to about 10% of the pile diameter. The ratios of base to shaft capacities of the piles were found to vary with the length to diameter ratio, surface roughness, and the density of the organic soil. The ultimate unit shaft resistance of the rough concrete pile was always greater than that of other piles irrespective of soil condition and pile length. However, the ultimate base resistance of all piles was approximately close to each other.
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Abstract– This study focused on the process of bacterial calcium carbonate (CaCO3) precipitation (BCCP) in organic soil. Two samples, organic soil and sand, in glass boxes having dimensions 6×6×2 cm were immersed in bacterial medium... more
Abstract– This study focused on the process of bacterial calcium carbonate (CaCO3) precipitation (BCCP) in organic soil. Two samples, organic soil and sand, in glass boxes having dimensions 6×6×2 cm were immersed in bacterial medium (Bacillus pasteurii, urea, and CaCl2) for 4 days. During the treatment period, the samples were treated with urea medium and CaCl2 every 6 h. Changes in pH values were monitored at different time intervals. At the end of the treatment period, the amount of CaCO3 was determined with a calcimeter test. The test results showed that the pH values fluctuated between 9 and 9.4 during the treatment period. This range of pH values indicates that the treatment medium is appropriate for BCCP. The amount of precipitated CaCO3 in the organic soil sample increased about 8% compared with the untreated sample. Calcium carbonate precipitation in sand is found to be higher than the organic soil. The results were supported by Scanning Electron Microscopy (SEM) analysis an...
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Research Interests: Materials Science, Waste Management, Multidisciplinary, Replacement of Sand by Rice Husk and Glass Powder, Soda Lime, and 6 moreCONCRETE WITH WASTE GLASS POWDER, Lime, Sieve Analysis, Glass Powder, Stability of Waste Glass Powder As a Partial Replacement of Cement In Self Compaction Concrete, and Soda Lime Glass
In this study, effect of water content, density, and sand content on shear strength parameters of organic soil were investigated. For this purpose, three sets of tests were carried out in the laboratory. In the first set, water content of... more
In this study, effect of water content, density, and sand content on shear strength parameters of organic soil were investigated. For this purpose, three sets of tests were carried out in the laboratory. In the first set, water content of the samples was changed at same density. In the second set, water content was kept constant but density was changed. In the third set different percent of sand by weight was mixed with organic soil. Direct shear test was used in all tests. Test results showed that water content, density, and sand content effects shear strength of organic soil.
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In this study, effect of different sand content on compaction properties of organic soil was investigated. Organic soil used in the study was taken from Sakarya region, Turkey. Compaction test was carried out with standard 2.5 kg hammer.... more
In this study, effect of different sand content on compaction properties of organic soil was investigated. Organic soil used in the study was taken from Sakarya region, Turkey. Compaction test was carried out with standard 2.5 kg hammer. Five different sand content was used that are 10%, 20%, 30%, 40% and 50%. Test results showed that sand content has an important effect on both dry density and optimum moisture content. When the sand content incresed in the organic soil optimum moisture content reduced and the maximum dry density increased.
Research Interests: Engineering, Materials Science, Geotechnical Engineering, Geotechnical Investigation, Engineering Geology and Geotechnical Problems, and 10 morePeat, Geotechnics, Geotechnical Enginnering, ORGANIC SOIL, Compressibility, Compaction, Specific Gravity, Water Content, Peat Soil, and Proctor Compaction Test
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ABSTRACT The paper presents the results of the study which influence the use of recycled waste expanded polystyrene foams (EPS), as a lightweight material used with river sand. In this study, thermally modified waste EPS have been used.... more
ABSTRACT The paper presents the results of the study which influence the use of recycled waste expanded polystyrene foams (EPS), as a lightweight material used with river sand. In this study, thermally modified waste EPS have been used. The waste EPS were put in an oven at 130 °C through 15 min to obtain modified expanded polystyrene (MEPS). The influences of MEPS on compaction properties such as maximum dry density and optimum moisture content were investigated. For this purpose, five series of compaction tests were carried out. MEPS were added to river sand at 5, 10, 15, and 20 % by weight. The test results showed that addition of 20 % MEPS in sand reduces the density of mixture almost 50 %. MEPS can be an alternative light weight fill material for geotechnical applications.
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In this study, interface frictional resistance between organic soil and some of construction material was investigated. Construction materials used in this work are concrete, metal, and wood. Interface friction angle were determined for... more
In this study, interface frictional resistance between organic soil and some of construction material was investigated. Construction materials used in this work are concrete, metal, and wood. Interface friction angle were determined for three different water contents values of organic soil dry, 25%, 50%, and 75% respectively. Different face roughnesses were tested for different water content. All tests were carried out using direct shear test device. Three different normal forces were used and shear stress at 10% strain rate was taken as maximum shear stress. Test results showed that water content of the organic soil, material type, and surface roughness should be considered while selecting interface friction angle between organic soil and construction materials.
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This study was undertaken to investigate some specific problems that limit a safe design and construction of structures on problematic soils. An experimental study was carried out to examine the influence of loading rate and moisture... more
This study was undertaken to investigate some specific problems that limit a safe design and construction of structures on problematic soils. An experimental study was carried out to examine the influence of loading rate and moisture content on shear strength of organic soil. Influece of moisture content on interface friction between organic soil and structural materials was also attempted. A commonly used soil in Iraq was prepared at varying moisture contents of 39%, 57% and 75%. The experimental results showed that the increase in water content will decrease the shear stress and the internal friction angle. An increase of the shearing rate was found to decrease the shear stress and internal friction angle for all percetanges of water contents. Further, direct shear tests were carried out to detect the interface shear stress behavior between organic soil and structural materials. The results revealed that the increase in water content was shown to have significant negetavie effects...
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This study was carried out to undrestand some specific problems that limit safe design and construction of structures on problematic soils. An experimental study was undertaken to examine the influence of the rate of loading and moisture... more
This study was carried out to undrestand some specific problems that limit safe design and construction of structures on problematic soils. An experimental study was undertaken to examine the influence of the rate of loading and moisture content on shear strength of organic soil. Influece of moisture content on interface friction between organic soil and structural material was also attempted. A commonly used soil in Iraq was prepared at varying moisture contents of 39, 57 and 75 %. The experimental results showed that the increase in water content will decrease the shear stress and the internal friction angle. An increase of the shear rate was found to decrease the shear stress and internal friction angle at all percetanges of water contents. Further, direct shear tests were carried out to detect the interface shear stress behavior between the organic soil and structural material. The results revealed that the increase in water content was shown to have significant negetavie effect...
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This paper shows the results of an experimental study conducted to research the impact of waste marble powder (WMP) and fly ash (FA) on the fluidity (marsh cone flow time (MCFT), mini-slump diameter and plate cohesion meter (PCM)) and the... more
This paper shows the results of an experimental study conducted to research the impact of waste marble powder (WMP) and fly ash (FA) on the fluidity (marsh cone flow time (MCFT), mini-slump diameter and plate cohesion meter (PCM)) and the rheological properties (viscosity and yield stress) of cement based grout (CBG) mixtures. The experiments were applied with the CBG mix including 1.00 water-binder (w/b) ratios and combined use of WMP (5-25%), FA (5-25%) and WMP+FA (10-30% + constant 25%). Test results illustrated that the rheological properties of the CBGs importantly have been improved by the addition of WMP, FA and WMP+FA to grout mix at w/b=1 ratio. Strongly shear thickening behaviour was got from the CBG mixtures the all WMP, FA and WMP+FA content. The increase in the percentage of WMP (5-25%) amount reduced the mini-slump flow diameter. Moreover, the increment in the percentage of FA (5-25%) amount increments the mini slum flow. According to the control sample, the increment ...
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This research aims to experimentally investigate the potential use of a geopolymer made from various stabilizers or byproducts (fly ash (FA-F, FA-C), slag (SL), glass powder (GP), metakaolin (MK), marble powder (MP), bottom ash (BA), rice... more
This research aims to experimentally investigate the potential use of a geopolymer made from various stabilizers or byproducts (fly ash (FA-F, FA-C), slag (SL), glass powder (GP), metakaolin (MK), marble powder (MP), bottom ash (BA), rice husk ash (RHA), silica fume (SF)) to enhance the mechanical performance of soil (clay) via a deep mixing technique. Strengths of geopolymer soilcrete specimens were determined by unconfined compressive strength (UCS) tests regarding curing times (7 to 365 days) by comparing with Portland cement (PC). In addition, ultrasonic pulse velocity (UPV) tests, the effect of molarity (8–16 M), stress-strain behavior, failure modes, and microstructure (SEM, EDX) of geopolymer specimens were examined. Compared to PC, UCS responses of geopolymer specimens yielded: (i) a decreasing trend for FA-F, GP, MK, BA, and MP + FA-F, (ii) an increasing trend for FA-C, SL, and combinations of SL (BA + SL, RHA + SL, SF + SL, MK + SL) favorable with fewer proportions of stab...
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Abstract This paper shows the results of an experimental study conducted to investigate the effect of waste marble powder (WMP) on the fluidity (marsh cone flow time (MCFT), mini-slump diameter and plate cohesion meter (PCM)) and the... more
Abstract This paper shows the results of an experimental study conducted to investigate the effect of waste marble powder (WMP) on the fluidity (marsh cone flow time (MCFT), mini-slump diameter and plate cohesion meter (PCM)) and the rheological properties (viscosity and yield stress) of cement based grout (CBG) mixtures. The experiments were done with the CBG mixture including 0.75, 1.00, 1.25, 1.50 water-binder (w/b) ratios and 5, 10, 15, 20 and 25% content of WMP. Test results illustrated that the rheological properties of the CBGs had been improved greatly by the addition of WMP to grout mix at various w/b ratios. It was observed that the CBG mixtures showed a strong shear thickening behavior all WMP content and all w/b ratios. Moreover, the increase in the w/b ratio decreases the MCFT at the constant WMP content. Additionally, the increase in the percentage of WMP amount up to %15 did not effect on mini slump flow diameter, however the mini - slump flow diameter decreased above %15 WMP.
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It is important to know the reliability of the correlations unconfined compressive strength (UCS) versus blow count of standard penetration test (SPT-N) available in the literature for foundation design of constructions. However,... more
It is important to know the reliability of the correlations unconfined compressive strength (UCS) versus blow count of standard penetration test (SPT-N) available in the literature for foundation design of constructions. However, selection of best performed equation verified with local data always becomes a primary issue for the site of interest foundation constructed. Thus, this paper investigates the performances of some UCS versus SPT-N correlations for the applicability to fine-grained soils in an interested area. A novel ranking measure called ranking distance (RD) that accounts equal weighting to the accuracy and precision of estimation has been used for the performance assessment of the equations, in comparison with alternative measures. The RD index is a comprehensive ranking measure for performing the dependability of an empirical equation with regard to the accuracy and precision, using the ratios of estimated and measured UCS. Dependent upon the analysis results in the study, the performances of equations have been ranked high, moderate, low and unacceptable (the worst equations). The equations have also been categorized whether they influence more weighting to precise or accuracy, or equal accuracy and precise during the estimations of UCS. From the results, it is concluded that the best performed estimation based on the RD is proposed by the equation of low plastic clay (Sivrikaya and Togrol, in: 5th international congress on advances in civil engineering, Istanbul, Turkey, pp 943–952, 2002; Eng Geol 86:52–69, 2006). Consequently, the study has successfully demonstrated the use of RD for assessing the best equation by confirming its results with the alternative methodologies compared. This could be beneficial for the experimenters in practice to attempt the validations of different empirical equations with different parameter through a good ranking procedure.
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Nowadays, Iraq is experiencing a rapid reconstruction process during which a significant amount of construction waste material is generated. One of such materials is RAP (reclaimed asphalt pavement) which is obtained from the removal of... more
Nowadays, Iraq is experiencing a rapid reconstruction process during which a significant amount of construction waste material is generated. One of such materials is RAP (reclaimed asphalt pavement) which is obtained from the removal of surface pavement of roads and used especially as an aggregate substitute in asphalt mix, granular base and sub-base material for roads, or as road fill material. From this point of view, the primary objective of this study was to evaluate the possible effects of adding sand to RAP in terms of compaction and strength properties and to suggest a possible recycling application. For this purpose, RAP and sand samples were collected from Iraq. Then, RAP/sand blends were prepared by mixing RAP with 5%, 10%, 15%, 20%, 25%, and 50% sand by weight. Modified Proctor Compaction and California Bearing Ratio (CBR) tests were performed on these samples. The results have revealed that the compaction properties of the RAP/sand blends were significantly improved as compared to RAP samples resulting in increased maximum dry density and optimum moisture content. CBR values of the tested mixtures had also increased with increasing sand content similar to the results of previous studies. The primary finding of this study was that RAP/sand blends with a sand content of 20% or more were defined to be suitable for use as road fill material according to the American Association of State Highway and Transportation Officials (AASHTO) standards in terms of tested parameters, providing a new field for recycling of RAP in the studied region.
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The deep mixing has recently become a popular technique for improvement of weak or problematic soils in order to increase bearing capacity and reduce settlement. Despite various successful applications in construction projects,... more
The deep mixing has recently become a popular technique for improvement of weak or problematic soils in order to increase bearing capacity and reduce settlement. Despite various successful applications in construction projects, specifically improvement of marginal sand (i.e., loose poorly graded sand) using new materials in the viewpoint of strength development is still open for the attempt of deep mixing regarding the binder of grout, curing time and clay content. Thus, in this paper, effect of glass powder added to cement-based slurry grout in different proportions (0, 3, 6, 9% by dry weight of binder) has been experimentally investigated for deep mixing of marginal sand with various clay contents (4, 8, 20%). An experimental program has been developed for this purpose conducting the Vicat, unconfined compressive strength (UCS) and ultrasonic pulse velocity (UPV) tests for the performances of soilcrete samples. From the testing results, it is found that: (i) The glass powder is not able to accelerate the setting times of grout, (ii) the bulk density does not significantly change with the glass powder, clay content and curing time, (iii) the most performed UCS value is obtained due to the addition of 3% glass powder at the 28-day curing for the soilcrete samples of 20% clay content of sand, while all UCS magnitudes obtained for the soilcrete samples are considered acceptable for the construction of soil–cement column, (iv) the elastic modulus correlates well with the UCS values (R$$\ge $$≥ 0.83) at the majority of soilcrete samples and (v) the UPV values of soilcrete samples at 28-day curing perform better due to the addition of 3% glass powder similar to the response trend of UCS, while their performances are higher due to 4% clay content in contrast to the trend of UCS. As a consequence, this study demonstrates the use of glass powder added grout to be beneficial for deep mixing of marginal sand, in which 20% clay inclusion contributes more.
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... more
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 $$w/c = 1.50$$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.
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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... more
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 fillin...
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Abstract Understanding the basic phenomena controlling the mobilization of friction at the soil-solid surface contact is essential for such traditional foundation structures such as piles, micropiles and anchors. In this study, the... more
Abstract Understanding the basic phenomena controlling the mobilization of friction at the soil-solid surface contact is essential for such traditional foundation structures such as piles, micropiles and anchors. In this study, the interface frictional characteristics of organic soil and a variety solid construction materials, including concrete, steel, and wood, were investigated. The interface friction angles of organic soil-solid surfaces were determined for different water content and granular soil content. In addition, the relationship between surface roughnesses and interface friction was investigated. All tests in this study were performed using a direct shear test device under different normal stresses. The test results showed that the frictional resistance between construction material and organic soil is affected by the water and granular soil content of the organic soil, the type of material, and the surface roughness.
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Abstract This work presents an investigation of the effect of waste aluminum beverage cans strips on strength and swelling properties of lean clay. Waste beverage cans (WBC) were cut into 5 mm strips and mixed with soil in 2, 4, 6, 8, and... more
Abstract This work presents an investigation of the effect of waste aluminum beverage cans strips on strength and swelling properties of lean clay. Waste beverage cans (WBC) were cut into 5 mm strips and mixed with soil in 2, 4, 6, 8, and 10% (dry weight of soil) before use. Three standard tests were carried on the prepared samples: compaction, free swelling, and California Bering Ratio (CBR). Test results showed that WBC significantly affected the compaction characteristics, swelling and strength properties of the clay.
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This study was carried out with an intention to observe any sign of improvement of clayey soil due to addition of waste soda lime glass powder (WSLGP). Waste soda lime glasses were crushed and sieved through #200 (75 μm) sieve and mixed... more
This study was carried out with an intention to observe any sign of improvement of clayey soil due to addition of waste soda lime glass powder (WSLGP). Waste soda lime glasses were crushed and sieved through #200 (75 μm) sieve and mixed with clay in 3, 6, 9, and 12% in dry weight of the clay. Strength and consistency test were carried out on mixed samples after curing. The test results indicated that the addition of WSLGP into clay has a significant effect on the strength and consistency properties of the clay.
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This work presents an investigation of the effect of waste aluminum beverage cans strips on strength and swelling properties of lean clay. Waste beverage cans (WBC) were cut into 5 mm strips and mixed with soil in 2, 4, 6, 8, and 10 %... more
This work presents an investigation of the effect of waste aluminum beverage cans strips on strength and swelling properties of lean clay. Waste beverage cans (WBC) were cut into 5 mm strips and mixed with soil in 2, 4, 6, 8, and 10 % (dry weight of soil) before use. Three standard tests were carried on the prepared samples: compaction, free swelling, and California Bering Ratio (CBR). Test results showed that WBC significantly affected the compaction characteristics, swelling and strength properties of the clay.
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The paper presents the results of series of direct shear tests made on recycled waste expanded polystyrene foams (EPS). Waste EPS were thermally modified in an oven at 130 o C through 15 minutes and crushed into aggregate size before... more
The paper presents the results of series of direct shear tests made on recycled waste expanded polystyrene foams (EPS). Waste EPS were thermally modified in an oven at 130 o C through 15 minutes and crushed into aggregate size before tested. Heat treatment of the EPS increased its density from 15 kg/m 3 to nearly 200 kg/m 3. Shear strength behavior of modified EPS were investigated in loose and dense states under three different normal stresses. The test results showed that shear strength behavior of modified EPS is similar to that of sand. Internal friction angle of modified waste EPS in the dense state is higher than of loose state.
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In order to provide a fast and cost-effective solution, particularly for preliminary evaluations in many design situations of constructions, a number of numerous empirical equations for estimation of compression index simply established... more
In order to provide a fast and cost-effective solution, particularly for preliminary evaluations in many design situations of constructions, a number of numerous empirical equations for estimation of compression index simply established with soil index properties are intensively used for consolidation settlement. However, they may not be appropriate when considered for different regions dependent upon local site conditions. Thus, it is important to know the performances of the empirical equations with local data. This paper investigates the performances of some of the empirical equations for estimation of compression index for fine-grained soils of Baghdad City along the Tigris River. Four criteria including error and ranking measurement were employed as bases of evaluation: root mean square error, the ratio of estimated to measured (laboratory) compression index, ranking index and ranking distance (RD). The last two (ranking index and RD), a relatively new approach of ranking measurement, involve with the accuracy and precision of estimated result with actual data. The assessment ultimately has been done regarding the RD, since it is a comprehensive statistical parameter that gives equal weight to the accuracy (mean) and precise (standard deviation) of estimation, as compared with others. It is found from the analysis results that the overall best estimation of compression index for the data of Baghdad was obtained by the empirical equations established with liquid limit proposed by Cozzolino and Azzouz, Krizek, and Corotis. The results indicate that the most reliable equation correlates compression index with liquid limit.
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Abstract In the past few years, the use of bacterial calcium carbonate precipitation has become popular as a ground-improvement technique for sandy soil. However, this technique has not been applied to organic soil. This study focused on... more
Abstract In the past few years, the use of bacterial calcium carbonate precipitation has become popular as a ground-improvement technique for sandy soil. However, this technique has not been applied to organic soil. This study focused on bacterial calcium carbonate precipitation and its effect on the compressibility and strength of organic soil. A special injection system was prepared for inducing a bacterial solution into several samples. The bacterial solution was supplied to the samples by gravity for 4 days in specific molds designed for this work. Calcite precipitation was observed by monitoring the changes in the pH value and by measuring the amount of calcium carbonate in the organic soil. The changes in compressibility and strength were measured before and after the bacterial treatment. The test results showed that the pH values in the treatment medium reached the ideal values that are appropriate for calcite precipitation. It was found that the amount of precipitated calcium carbonate in organic soil increased by about 20% in the treated samples compared to that in the untreated samples. Moreover, the test results indicated that the bacterial treatment influenced the compressibility and shear strength of the organic soil. The results were supported by an energy-dispersive x-ray (EDX) analysis.
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Research Interests: Civil Engineering, Soil Stabilization, Building, EFFECTS RICE HUSK ASH AS A CEMENTITIOUS MATERIAL ON FRESH AND HARDENED CONCRETE, Permeation Grouting, and 9 moreGrouting, STABILIZING ROAD PAVEMENT MATERIAL USING RICE HUSK ASH AS PARTIAL REPLACEMENT WHITH CEMENT ON LATERIC SOIL, Ultilization of Rice Husk Ash, Building and Construction Materials, Soil Improvement, Jet Grouting, Rice husk Ash, STABILIZATION OF EXPANSIVE SOILS, and RHA
This study focused on the effect of particle size of sandy soil on bacterial calcium carbonate precipitation (BCCP). Four samples of sandy soil in different particle size (150-300), (300-600), (600-1mm) and (1mm-2mm), were prepared... more
This study focused on the effect of particle size of sandy soil on bacterial calcium carbonate precipitation (BCCP). Four samples of sandy soil in different particle size (150-300), (300-600), (600-1mm) and (1mm-2mm), were prepared in glass boxes having dimension of 6x6x2 cm were treated by immersing in bacterial medium (Bacillus pasteurii, urea, and CaCl2) for 4 days. The samples were treated by urea medium and CaCl 2 every 6 hours during this treatment period. Throughout the treatment time change in pH values were monitored each 6 hour. Also, amount of calcium carbonate in all samples were determined by using calcimeter test at the end of treatment. The test results showed that the pH values fluctuated between (9-9.3) during treatment stage for all samples. This range of the pH values indicates that the treatment medium is appropriate for BCCP. It was also found that the amount of precipitated calcium carbonate in occurred in all samples but in different percentage, the maxim...
Bacterial calcium carbonate precipitation has been used to improve strength and permeability of granular soil. Indeed, very encouraging results have been obtained. Commercially available bacteria have been used in this treatment method.... more
Bacterial calcium carbonate precipitation has been used to improve strength and permeability of granular soil. Indeed, very encouraging results have been obtained. Commercially available bacteria have been used in this treatment method. This laboratory scale work is aimed to investigate the feasibility of this new improvement technique in peat that has low strength and high compressibility. For this purpose, two-stage works were carried out. In the first stage, isolation of calcite precipitating bacteria from local soil has been investigated. In the second stage, bacteria have been induced into the peat with treatment solution. The amount of precipitated calcite was determined at the end of the treatment. A preliminary direct shear test has been performed on treated and untreated sample to observe the effect of calcite precipitation on shear strength of the peat. Test results have demonstrated that ureolytic and calcite precipitating bacteria could be isolated from local soils. The treatment has indicated that solid calcite particles precipitated in the peat were nearly 16 % by weight. The shear strength test results have shown that precipitated calcite caused cementing effect on the peat particles.
Research Interests: Engineering and Chemistry
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... more
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.