Influence of Compaction Energy on Cement Stabilized Soil for Road Construction

Abstract

Compactness is an important feature to ensure subgrade stability where temperature and water infiltration exist in semi-arid areas. Chemical soil stabilization can improve soil properties. This research studies the impact of compaction energy on stabilized subgrade soil and how to improve its geotechnical characteristics in the experimental tests on both unstabilized and stabilized soil samples by adding ordinary Portland cement and sulfate-resistant cement, in percentages by the soil's weight, in order of identification and classification, to the strength properties tests: compaction at multiple energies, CBR, and UCS. A test protocol was followed to assess the relationship between cement soil treatment, mechanical characteristics, and compaction parameters at different energy levels. Findings show that the higher UCS values were recorded with an increase in compaction energy. The MDD of cement stabilized soil increases as compaction energy increases, whereas the OMC decreases, the UCS improves, and the CBR increases. These improvements have a positive influence on the performance of soil used as a subgrade. The combination of cement stabilization and a high compaction level for subgrades using weak soil can improve strength parameters throughout any phase of earthwork construction design that leads to strengthening subgrades, reducing the thickness, and, as a result, low construction cost. Doi: 10.28991/CEJ-2022-08-03-012 Full Text: PDF

A Framework for Determining the Optimal Vibratory Frequency of Graded Gravel Fillers Using Hammering Modal Approach and ANN

“…Additionally, the ANN model was trained using the Adam optimizer algorithm [37,38]. During the training, the mean absolute error (MAE) was used as the objective function to calculate particle fitness, which could be calculated by Equation (6). As shown in Figure 14, the establishment of the ANN prediction model (ANN-PM) based on f ov primarily involved three steps: (1) partitioning the dataset, (2) developing the ANN-PM based on the training set, (3) and evaluating the performance of the ANN-PM based on the testing set.…”

“…Vibratory compaction was the mainstream method in subgrade construction, where the vibration frequency was closely related to compaction quality control. Unreasonable vibration frequencies could lead to poor control of subgrade compaction quality, which caused various types of subgrade diseases, such as uneven settlement [ 4 , 5 ] and permanent deformation [ 6 , 7 ]. Meanwhile, there has been limited research on the intelligent prediction of the optimal vibratory frequency f ov for vibratory compaction, which has hindered the development of intelligent subgrade construction [ 8 ].…”

The Behavior of Dredged Soil-Shredded Rubber Embankment Stabilized with Natural Minerals as a Road Foundation Layer

“…Soil stabilization methods are considered to improve the geotechnical properties of dredged soil before use. Mixing the soil with cement, lime, fly ash, bottom ash, bacteria, pozzolan, and zeolite are some of the soil stabilization techniques to optimize the geotechnical characteristics of dredged soil [5][6][7][8][9][10].…”