Selesai
a. Pengambilan tanah lempung Plastisitas Tinggi (CH) b. Penambahan material :
1. Portland Cement Composite (PCC) 2. Fly Ash
Pengujian Sifat-sifat fisik tanah : Berat jenis, Atterberg, Hidrometer
Mulai
Uji CBR
Uji Pemadatan Proctor Standar
(Kadar Air Optimum dan Berat Kering Maksimum)
Analisis Data Kesimpulan
Persiapan Sample CBR 1 Clay 100%
2 Clay 80% + Cement 20%
3 Clay 75% + Cement 20% + FA 5%
4 Clay 70% + Cement 20% + FA 10%
5 Clay 65% + Cement 20% + FA 15%
6 Clay 60% + Cement 20% + FA 20%
7 Clay 55% + Cement 20% + FA 25%
8 Clay 50% + Cement 20% + FA 30%
Cement is widely used for soil stabilization in various countries. The presence of water, calcium silicate, and aluminate in cement will form a hydrate compound which will produce a strong and hard arrangement/bond that envelops and binds the mixed material. Cement in a general sense is a material that has adhesive and cohesive properties, is used as a bonding material, which is used together with gravel and sand.
Soil Stabilization Using
Mixture of Cement and Fly Ash
Soil improvement is the steps taken to stabilize the soil by improving the characteristics of the original soil by adding heap materials and lining materials. The soil improvement serves to support strong soil shear, decrease soil compressibility, increase or decrease soil permeability and several other technical requirements.
Soil stabilization can be done mechanically, physically and chemically. Mechanical soil stabilization includes compaction and vertical drainage; Physical stabilization includes improving soil gradation by adding soil granules needed to achieve a good graded from the previous state (poor graded). Chemical stabilization includes the use of bitumen, lime, polymers and other chemicals.
Admixtures are natural or artificial additives in the form of liquids or powders which are mixed into the concrete or soil mix, processed before or during the concrete or soil mixing process to modify the characteristics of the concrete and soil.
Cement
Fly Ash
Fly ash is a material that has a fine grain size, is gray in color and is obtained from burning coal.
Fly ash contains chemical elements such as silica (SiO2), alumina (Al2O3), ferrous oxide (Fe2O3), and calcium oxide (CaO), which can be used as additives for soil stabilization. The use of fly ash for soil stabilization is because fly ash has pozzolanic properties and can also reduce shrinkage and cracking problems that usually arise when using cement as a soil stabilizing agent.
Content Determination Method
Soil addmixture
Protection of slopes of fills and excavations Restoration of vegetation on eroded slopes Soil stabilization
Heap, The use of Geocell on soft soil can reduce settlement and increase soil bearing capacity (Zhang, dkk, 2010).
Road Construction, Reinforcement using geocells reduces the vertical stress transferred to the subgrade by distributing the load over a wider area (Thakur & Han, 2012)
Railway, Detention on railroad ballast using Geocell is quite effective in reducing vertical deformation even when using low quality backfill. (Leshchinsky & Ling, 2013).
Soil Retaining Wall, Geocells in retaining walls are used to delimit soil which results in increased soil shear strength and prevents structural failure. The advantage of using geocells on retaining walls is that they can be planted with plants as facing.
Proteksi Lereng & Erosi Control, Geocell can protect slopes from erosion and provide fill in fill.
Geocells are also used on slope surfaces where the main cause of erosion is rainwater runoff.
Geosynthetics
Geosynthetics is a manufactured product made of polymer materials used for structures related to soil, rock or other geotechnical engineering materials. The types of geosynthetics that are generally used are geotextile, geocell, geogrid, geomembrane, geocomposite, geomat, geosynthetic clay liner, geopipe and others. The materials used for geosynthetics come from the plastics industry, namely polymer, rubber, fiberglass, and other materials. All geosynthetics are generally made of strong, durable materials, the basic ingredients of which are resistant to chemical reactions, weather influences and aging processes, and, geosynthetics also have special specifications, such as resistance to temperature or ultra violet rays.
GEOCELL
Geocell is one of the geosynthetic materials made from the union of cell-shaped sheets.
Geocells are designed to be filled with soil. This material is considered to have good resistance and is environmentally friendly. Its use is quite broad and varied.
The Geocell Applications Include
Geocells are lightweight and flexible three-dimensional panels that can be expanded/expanded like a harmonic instrument. The main material is High-Density Polyethylene (HDPE) strips which are bonded ultrasonically to obtain a strong configuration. Based on the surface there are two types of Geocell, namely smooth and rough (textured)..
The use of geocells is also preferred because the price is relatively lower than other systems.
Maintenance costs are not too expensive so it is suitable for long-term projects. In addition, geocell is an environmentally friendly material. The carbon footprint is relatively low and the fill aggregate needed by geocells can also use recycled materials.
