본 연구는 폐 타이어를 미사질 토양에 혼합하여 경기장 식재층으로서의 질을 향상 시키고자 실시하였다. 특히 본 실험을 통해 토양에 혼합되는 폐 타이어의 입경 크기와 혼합량에 따라 식재층의 토양 물리적 특성을 측정하고자 하였다. 실험에서 두 종류의 토양 [Arenzville silt loam(coarse-silty, mixed, nonacid, mesic Typic Udifluvents), Hosmer silty clay loam(fine-silty, mixed, mesic Typic Fragiudalfs)]과 입경 크기(3.5, 6.5, 9.5mm)에 따라 세 가지의 폐 타이어를 사용하였다. 각각 크기별 토양에 혼합된 폐 타이어의 혼합 비율은 0에서 0.4 $g{\cdot}g^{-1}$ 사이였다. 각각의 처리구에 대한 실험 진행 및 물리성 조사는 미국 골프협회 Green Section Record 의 기준 방법에 준해서 실시하였다. 본 실험의 결과 토양에 혼합된 폐 타이어의 비율이 증가 할수록 토양의 총 공극량은 감소하였다. 하지만 입경 크기와 상관없이 폐 타이어의 혼합량이 0.15 $g{\cdot}g^{-1}$ 이하인 경우에는 대공극과 포화투수계수에 차이가 없었다. 반면 폐타이어가 0.15 $g{\cdot}g^{-1}$ 이상으로 혼합된 토양은 대 공극, 포화 투수계수, 그리고 공기 투과율이 대조구에 비해 통계적으로 유의하게 개선되었다.
본 연구는 폐 타이어를 미사질 토양에 혼합하여 경기장 식재층으로서의 질을 향상 시키고자 실시하였다. 특히 본 실험을 통해 토양에 혼합되는 폐 타이어의 입경 크기와 혼합량에 따라 식재층의 토양 물리적 특성을 측정하고자 하였다. 실험에서 두 종류의 토양 [Arenzville silt loam(coarse-silty, mixed, nonacid, mesic Typic Udifluvents), Hosmer silty clay loam(fine-silty, mixed, mesic Typic Fragiudalfs)]과 입경 크기(3.5, 6.5, 9.5mm)에 따라 세 가지의 폐 타이어를 사용하였다. 각각 크기별 토양에 혼합된 폐 타이어의 혼합 비율은 0에서 0.4 $g{\cdot}g^{-1}$ 사이였다. 각각의 처리구에 대한 실험 진행 및 물리성 조사는 미국 골프협회 Green Section Record 의 기준 방법에 준해서 실시하였다. 본 실험의 결과 토양에 혼합된 폐 타이어의 비율이 증가 할수록 토양의 총 공극량은 감소하였다. 하지만 입경 크기와 상관없이 폐 타이어의 혼합량이 0.15 $g{\cdot}g^{-1}$ 이하인 경우에는 대공극과 포화투수계수에 차이가 없었다. 반면 폐타이어가 0.15 $g{\cdot}g^{-1}$ 이상으로 혼합된 토양은 대 공극, 포화 투수계수, 그리고 공기 투과율이 대조구에 비해 통계적으로 유의하게 개선되었다.
This research was initiated to enhance the tilth of fine-textured soil for turf growth by incorporation of crumb rubber shredded from used tires. A specific objective was to determine the physical properties of soil mixes amended with different grade and amount of crumb rubber in soils. Two soils an...
This research was initiated to enhance the tilth of fine-textured soil for turf growth by incorporation of crumb rubber shredded from used tires. A specific objective was to determine the physical properties of soil mixes amended with different grade and amount of crumb rubber in soils. Two soils and three different grades(3.5, 6.5 and 9.5 mm) of crumb rubber were used. The soils selected were an Arenzville silt loam(coarse-silty, mixed, nonacid, mesic Typic Udifluvents) and a Hosmer silty clay loam(fine-silty, mixed, mesic Typic Fragiudalfs). The amount of crumb rubber mixed in soil ranged from 0 to 0.4 $g{\cdot}g^{-1}$(using 0.05 $g{\cdot}g^{-1}$) increments and 0 as a control. For each treatment, soil cores were constructed following the recommendation by the United States Golf Association Green Section Record. Results indicated that porosity of the mixes decreased as the amount of crumb rubber increased. Regardless of the grade of crumb rubber, mixes with less than 0.15 $g{\cdot}g^{-1}$ of crumb rubber in fine-textured soil could not enhance their macro-porosity and hydraulic conductivity. However, as the amendment increased over 0.15 $g{\cdot}g^{-1}$, the tilth of the mixes had improved significantly macro-porosity, hydraulic conductivity and air permeability, as compared with a control.
This research was initiated to enhance the tilth of fine-textured soil for turf growth by incorporation of crumb rubber shredded from used tires. A specific objective was to determine the physical properties of soil mixes amended with different grade and amount of crumb rubber in soils. Two soils and three different grades(3.5, 6.5 and 9.5 mm) of crumb rubber were used. The soils selected were an Arenzville silt loam(coarse-silty, mixed, nonacid, mesic Typic Udifluvents) and a Hosmer silty clay loam(fine-silty, mixed, mesic Typic Fragiudalfs). The amount of crumb rubber mixed in soil ranged from 0 to 0.4 $g{\cdot}g^{-1}$(using 0.05 $g{\cdot}g^{-1}$) increments and 0 as a control. For each treatment, soil cores were constructed following the recommendation by the United States Golf Association Green Section Record. Results indicated that porosity of the mixes decreased as the amount of crumb rubber increased. Regardless of the grade of crumb rubber, mixes with less than 0.15 $g{\cdot}g^{-1}$ of crumb rubber in fine-textured soil could not enhance their macro-porosity and hydraulic conductivity. However, as the amendment increased over 0.15 $g{\cdot}g^{-1}$, the tilth of the mixes had improved significantly macro-porosity, hydraulic conductivity and air permeability, as compared with a control.
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문제 정의
The aim of this study was to incorporate shredded tires as an amendment into indigenous fine-textured soil to enhance its tilth. The specific objectives of this study were to determine the optimal grade and amount of crumb rubber for the construction of optimal rootzone mixes for turf growth in sports fields.
The aim of this study was to incorporate shredded tires as an amendment into indigenous fine-textured soil to enhance its tilth. The specific objectives of this study were to determine the optimal grade and amount of crumb rubber for the construction of optimal rootzone mixes for turf growth in sports fields.
가설 설정
In this study, air permeability of all soil mixes was measured at water content retained at -20 kPa suction. The trends of air permeability, as shown in Figure 4 (a) and(b), of the soil mixes amended with different amounts of crumb rubber were similar to the hydraulic conductivity. When the soil mix was amended with a high rate of crumb rubber both air permeability and KSat values were high.
4 g . gl, the Hosmer silty clay loam mix had the highest Ksat regardless of the grade of crumb rubber. In general, adding crumb rubber to more finely textured soil was more beneficial than adding to the coarse-textured soil for enhancement of soil tilth.
대상 데이터
, 1979). The Arenzville silt loam was sampled from a soccer field located on the west side of the soccer stadium at the Southern. Illinois University Edwardsville(SIUE) campus.
The composite soil sample was collected from 0 to 150 mm at six different locations selected randomly within the soccer field. The Hosmer silty clay loam was obtained from a newly established turf experimental field at the Horticulture Research CenterCHRC), Southern Illinois University Carbondale(SIUC) campus.
이론/모형
g'1) of crumb rubber in the mix. Both particle densities of soil mineral and crumb rubber were determined by the pycnometer method(Blake and Hartge, 1986).
Prior to the test, the samples were air-dried and sieved through a 2 mm sieve. The textural properties of these two soils were analyzed by the hydrometer method(Gee and Bauder, 1986). Before mixing with crumb rubber, the moisture-density curve(Das, 1989) of each soil was developed to obtain the optimum moisture content for compaction.
성능/효과
Results also revealed less variability of Ksat in the Hosmer silty clay loam mix, particularly at the low level of amendment, compared with the Arenzville silt loam. As shown in Figure 3 (a), the soil mixes of the Arenzville silt loam amended with 3.5 mm crumb rubber had consistently the lowest KSat compared with the 6.5 and 9.5 mm crumb rubber mixes, but the results of Ksat with the 6.5 and 9.5 mm. crumb rubber mixes were varied. When the amendment increased to 0.
25 g - g'1. Results also revealed less variability of Ksat in the Hosmer silty clay loam mix, particularly at the low level of amendment, compared with the Arenzville silt loam. As shown in Figure 3 (a), the soil mixes of the Arenzville silt loam amended with 3.
Figures 2(a) and(b) are the results of macroporosity of the mixes. Results indicated that macro-porosity increased as the amount of crumb rubber increased in the mixes. For the mix of the Hosmer silty clay loam, results indicated that adding 0.
[2]. Results showed that porosity decreased as the amount of crumb rubber amended in soil increased regardless of the grade difference in crumb rubber. It is important to note that the grades of the crumb rubber selected in this study were larger than sand particles(USDA defines sand with a particle size between 0.
참고문헌 (22)
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