Vishweshwaran Muralidaran, Sujatha Evangelin Ramani, Rehman Ateekh Ur, Moghal Arif Ali Baig
Centre for Advanced Research in Environment, School of Civil Engineering, SASTRA Deemed University, Thanjavur 613401, India.
Department of Industrial Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia.
Polymers (Basel). 2024 Oct 7;16(19):2831. doi: 10.3390/polym16192831.
Acacia gum (AG), a polysaccharide biopolymer, has been adopted to improve the strength of three cohesive soils by subjecting them to diverse environmental aging conditions. Being a polysaccharide and a potentially sustainable construction material, the AG yielded flexible film-like threads after 48 h upon hydration, and its pH value of 4.9 varied marginally with the aging of the stabilized soils. The soil samples for the geotechnical evaluation were subjected to wet mixing and were tested under their Optimum Moisture Content (OMC), as determined by the light compaction method. The addition of AG modified the consistency indices of the soils due to the presence of hydroxyl groups in AG, which also led to a rise in OMC and reduction in Maximum Dry Unit weight (MDU). The Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR) were determined under thermal curing at 333 K as well as on the same day of sample preparation. The least performing condition of the soil's CBR was evaluated under submerged conditions after allowing the AG-stabilized specimens to air-cure for a period of 1 week. The UCS specimens tested after 7 days were subjected to the initial 7 days of thermal curing at 333 K. A dosage of 1.5% of AG yielded the UCS of 2530 kN/m and CBR of 98.3%, respectively, for the low compressible clay (LCC) after subjecting the sample to 333 K temperature for 1 week. The viscosity of the AG was found to be 214.7 cP at 2% dosage. Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and average particle size determination revealed the filling of pores by AG gel solution, adsorption, and hydrogen bonding, which led to improvements in macroproperties.
阿拉伯胶（AG）是一种多糖生物聚合物，通过使其处于不同的环境老化条件下，已被用于提高三种粘性土的强度。作为一种多糖和潜在的可持续建筑材料，AG在水化48小时后产生了柔性的薄膜状细丝，其4.9的pH值随稳定土的老化变化很小。用于岩土工程评价的土样进行了湿拌，并在通过轻型击实法确定的最佳含水量（OMC）下进行测试。由于AG中存在羟基，AG的添加改变了土的稠度指标，这也导致OMC升高和最大干容重（MDU）降低。无侧限抗压强度（UCS）和加州承载比（CBR）是在333K的热养护条件下以及在制备样品的同一天测定的。在让AG稳定的试样风干1周后，在浸水条件下评估了土的CBR的最差性能条件。7天后测试的UCS试样在333K下进行了最初7天的热养护。对于低压缩性粘土（LCC），在将样品在333K温度下放置1周后，1.5%的AG用量分别产生了2530kN/m的UCS和98.3%的CBR。发现2%用量的AG的粘度为214.7厘泊。扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和平均粒径测定表明，AG凝胶溶液填充孔隙、吸附和氢键作用导致宏观性能得到改善。
