Construction Of Economical Pavement Structures With Wood Ash

Stabilized mixes that are used in pavement structures are composed of aggregate bound with hydraulic binders (cement, lime) or bitumen. The most commonly used for the construction of base layers are mixes stabilized with cement. A long-standing construction practice for pavement structures was based on the use of quality granular materials for the construction of base layers. However, when designing the pavement structure and selecting materials, economy, sustainability, and environmental impact, in addition to their mechanical properties, should also be considered. Clear requirements and guidelines for sustainable development have imposed the need to explore the possibility of using non-standard materials in construction. Wood ash, which is formed as a residue from the combustion of biomass in the production of electricity and heat, is one of the newer and, in Croatia, less researched alternative materials that can be applied in construction. The paper describes compressive strength tests of mixtures of sand from the Drava River and cyclone wood ash stabilized with various contents of cement. The obtained results showed that with wood fly ash (in a content of 30 % mass.) in the stabilization mixture of sand, values of compressive strengths can be achieved within the required limits necessary for the construction of base layers of the pavement structure stabilized by a hydraulic binder.

Product Design for Reuse of Waste Construction Wood——Teapot Tray Design Practices

By using waste construction wood as the main raw material, the design practice is based on increasing the storage function of the teapot tray. In the design of the product, we strive to show the unique texture of the waste construction wood. Structural design is based on tenon-and-mortise structure, convenient assembly and disassembly of products as design principles, easy replacement of parts and continuation of product life as design purpose, and teapot tray design through product modular design ideas. Modeling design combined with traditional cultural concepts to “turn waste into treasure.”

Research on Product Design Method of Recycling Waste Building Wood

Start from the recycling of waste construction wood, use green design and other sustainable design concepts to study the reuse of construction waste wood in product design. Promote the effective use of construction waste wood resources, so that the residual value of waste construction wood resources can be fully reflected. Discover the material characteristics and advantages of waste construction wood, summarize relevant factors that should be considered in the reuse of waste construction wood in product design, and explore related design methods.

PERTUMBUHAN AWAL KAYU BAWANG (Dysoxylum mollissimum Blume) DENGAN SISTEM POLIKULTUR KELAPA DAN POLIKULTUR KELAPA SAWIT Early Growth of Kayu Bawang (Dysoxylum mollissimum Blume) in Polyculture System with Coconut and Oil Palm

Kayu bawang (Dysoxylum mollissimum Blume) adalah tanaman penghasil kayu yang paling dominan digunakan untuk memenuhi kebutuhan kayu pertukangan dan furnitur di Bengkulu. Umumnya di Bengkulu, kayu bawang telah ditanam dengan sistem polikultur dengan tanaman pertanian. Namun, evaluasi pertumbuhan awal dari kayu bawang dengan sistem polikultur kelapa dan polikultur kelapa sawit belum pernah dilakukan. Tujuan penelitian ini adalah mendapatkan persentase hidup dari tanaman kayu bawang dan perbandingan pertumbuhan awal antara bibit kayu bawang umur 4 dan 6 bulan dengan sistem polikultur kelapa dan polikultur kelapa sawit. Penelitian ini dilaksanakan di Desa Riak Siabun I, Kabupaten Seluma, Provinsi Bengkulu. Persentase hidup dan persentase tanaman normal dari tanaman kayu bawang disajikan secara deskriptif. Data pertumbuhan awal diameter dan tinggi tanaman kayu bawang pada ke dua sistem polikultur menggunakan analisis uji-t. Hasil penelitian menunjukkan bahwa tanaman kayu bawang yang ditanam dari bibit umur 4 dan 6 bulan dengan sistem polikultur kelapa memiliki presentase hidup dan persentase tanaman normal yang lebih tinggi dibandingkan dengan sistem polikultur kelapa sawit. Persentase hidup dan jumlah tanaman normal dari bibit kayu bawang umur 6 bulan lebih tinggi dibandingkan dengan bibit dari umur 4 bulan pada kedua sistem polikultur. Terdapat perbedaan pertumbuhan awal diameter dan tinggi kayu bawang pada satu tahun setelah tanam antara sistem polikultur kelapa dan polikultur kelapa sawit. Pertumbuhan awal diameter dan tinggi kayu bawang dengan sistem polikultur kelapa lebih baik daripada polikultur kelapa sawit.Kata kunci: pertumbuhan; kayu bawang; sistem polikultur; kelapa; kelapa sawitKayu bawang (Dysoxylum mollssimum Blume) is the most commonly used for construction wood and furniture in Bengkulu. In Bengkulu Kayu bawang is frequently planted in a polyculture system with other agricultural crops. The evaluation of kayu bawang early growth planted in polyculture system with coconut and oil palm has never been done so far. The objectives of this study were to investigate the survival rate and growth of 4 and 6 month old seedlings of kayu bawang in polyculture system with coconut and with oil palm. The study was conducted at Riak Siabun I village in Seluma Regency, Bengkulu Province. The survival rate of kayu bawang from both polyculture systems was presented and analysed. Diameter and height of seedlings were analysed and compared using t-test. The result showed that 4 and 6 month old seedlings of kayu bawang in polyculture with coconut had higher survival rate and were healthier than those in polyculture with oil palm. Six month-old seedlings of kayu bawang had higher survival rate and were healthier than the 4 month old seedlings. In conclusion, after one year of planting, kayu bawang planted in polyculture system with coconut had better growth than that in polyculture system with oil palm.