Sutrisno Wahyuniarsih, Wulandari Kiki Dwi, Abidin Muhammad Zainal, Rizal Moh Najib
Department of Civil Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia.
Politeknik Perkapalan Negeri Surabaya, Surabaya, 60111, Indonesia.
Heliyon. 2024 Feb 9;10(4):e25623. doi: 10.1016/j.heliyon.2024.e25623. eCollection 2024 Feb 29.
Sandblasting waste is a by-product obtained from the ship maintenance industry which is rich in silica content. This waste has a smaller particle size compared with typical sand and contains a high prevalence of impurities, so it is categorized as toxic and hazardous materials based on Indonesian Law. Furthermore, it also has not been efficiently harnessed, with most of it being relegated to disposal in waste landfills. To solve those problems, this research aimed to reduce the waste by reuse and recycle the sandblasting waste. In this study, the Pulverized Sandblasting Waste (PSW) used as additives in concrete mortars. Prior to use as an additive in mortar, the sandblasting waste was pretreated using chemical and mechanical processes. The mechanical pre-treatment was performed by pulverization for 8 and 12 h, later called PSW8h and PSW12h, respectively. Eleven mixture proportions were designed with constant Cement and w/c ratio. The PSW was added to the mortar specimens with a percentage of 0-5% from the weight of Cement as an additive. The test performed in this study includes compressive strength, Strength Activation Index (SAI), porosity, water absorption, and flexural test. The experimental results show that adding PSW into the mortar can enhance compressive and flexural strength. Furthermore, the results indicate that mortar with PSW has significantly lower porosity and water absorption than the control mixture. Using PSW with finer particle size shows better results in mechanical and durability properties of mortar, especially in concrete compressive and flexural strength.
喷砂废料是船舶维修行业产生的副产品，富含二氧化硅。与典型的沙子相比，这种废料的粒径较小，且杂质含量高，因此根据印度尼西亚法律，它被归类为有毒有害物质。此外，它也没有得到有效利用，大部分被运往垃圾填埋场处理。为了解决这些问题，本研究旨在通过对喷砂废料进行再利用和回收来减少废料。在本研究中，将磨细的喷砂废料（PSW）用作混凝土砂浆的添加剂。在用作砂浆添加剂之前，对喷砂废料进行化学和机械处理。机械预处理通过分别粉碎8小时和12小时进行，随后分别称为PSW8h和PSW12h。设计了11种配合比，水泥和水灰比保持不变。将PSW作为添加剂按水泥重量的0-5%添加到砂浆试件中。本研究进行的试验包括抗压强度、强度活化指数（SAI）、孔隙率、吸水率和弯曲试验。试验结果表明，在砂浆中添加PSW可以提高抗压强度和弯曲强度。此外，结果表明，与对照混合物相比，含有PSW的砂浆孔隙率和吸水率显著降低。使用粒径更细的PSW在砂浆的力学性能和耐久性方面表现出更好的效果，尤其是在混凝土抗压强度和弯曲强度方面。
