Kesan Penggunaan Sisa Industri Concrete Slurry (CSW) Terhadap Penstabilan Tanah

Abstract

Abstract: This study was carried out to identify the potential use of industrial waste known as “concrete slurry” intended for soil stabilization for road subgrade layers. Road soil sedimentation can be caused by various factors including heavy rain, construction of new infrastructure, excessive vehicle load, changes in soil properties and others. To overcome this problem, soil stabilization needs to be implemented during the construction process to increase the bearing capacity. Industrial waste such as “concrete slurry” can potentially be used in the soil stabilization process due to its properties that are similar as cement. This industrial waste was obtained from Hume Concrete Sdn. Bhd. Construction factory in Semambu, Kuantan. In order to study the potential of the waste, a total of six samples were prepared at the mixture rate of 0%, 8%, 16%, 24%, 32%, and 40% to be tested on the soil sample. The tests involved were compaction tests, sieve analysis tests, Atterberg limit tests and California Bearing Ratio (CBR) tests. The sample which has been compacted in the mould, is preserved for five days before the CBR test was carried out. Through analysis, it was found that the soil sample used in this study was of good grade with a high plasticity rate. Through the CBR test, it was found that the concrete slurry waste mixture of 32% showed the highest bearing ratio of 69% compared to the control sample of 12.5%. The total increase in soil strength was 81.88%. This shows that the use of this industrial waste can increase the strength of the soil bearing during the stabilization process and has the potential to be used as a stabilizing agent instead of cement or lime.

Abstrak: Kajian ini dilaksanakan bertujuan untuk melihat potensi penggunaan sisa industri iaitu “concrete slurry” terhadap penstabilan tanah bagi lapisan subgred jalan raya. Enapan tanah jalan raya boleh disebabkan oleh pelbagai faktor antaranya hujan lebat, pembinaan infrastruktur baru, beban kenderaan berlebihan, perubahan sifat tanah dan lain-lain. Bagi mengatasi masalah ini, penstabilan tanah perlu dilaksanakan semasa proses pembinaan bagi meningkatkan keupayaan galas. Sisa industri seperti “concrete slurry” berpotensi diguna pakai dalam proses penstabilan tanah kerana sifatnya sama seperti simen. Sisa industri ini diperolehi daripada kilang pembinaan Hume Concrete Sdn. Bhd Semambu, Kuantan. Bagi mengkaji potensi sisa tersebut, sebanyak enam sampel kajian telah disediakan pada kadar campuran sisa tersebut sebanyak 0%, 8%, 16%, 24%, 32%, dan 40% ke atas sampel tanah. Ujikaji yang terlibat adalah ujian pemadatan, ujian analisis ayakan, ujian had Atterberg dan ujian California Bearing Ratio (CBR). Sampel yang telah dipadatkan dalam mould, diawet selama lima hari sebelum ujian CBR dilaksanakan. Melalui analisis didapati sampel tanah yang digunapakai dalam kajian ini adalah bergred baik dengan kadar keplastikan tinggi. Melalui ujian CBR didapati campuran concrete slurry waste sebanyak 32% menunjukkan nisbah galas tertinggi iaitu 69% berbanding sampel kawalan 12.5%. Jumlah peningkatan kekuatan tanah adalah sebanyak 81.88%. Ini menunjukkan penggunaan sisa industri ini mampu meningkatkan kekuatan galas tanah semasa proses penstabilan dan berpotensi untuk dijadikan sebagai agen penstabilan menggantikan simen atau lime.