Vol. 2 No. 1 (2019)

This issue discusses the optimization of mix ratios and curing periods for subgrade fly ash soil, as well as the strength prediction of green cement mortar with marble powder by-products. These studies aim to enhance material performance, promote recycling, and support environmental protection, offering valuable insights for engineering practices and sustainable development.

  • Open Access

    Articles

    Article ID: 91

    Optimization of Fly-Ash to Soil Mix Ratio and Curing Period for Subgrade Use

    by M A Karim, Sami Hassan Ahmed , Fatih Oncul

    Insight - Civil Engineering, Vol.2, No.1, 2019; 3781 Views, 118 PDF Downloads

    DOI: https://doi.org/10.18282/ice.v2i1.91

    A laboratory study was conducted to determine the optimum fly-ash to soil ratio that can be used as a road subgrade to improve strength and compactability. Proctor compaction, grain size distribution, Atterberg limits, and unconfined compression tests were conducted. Proctor compaction test was conducted to determine the optimum moisture content and maximum dry density of soil samples with 0%, 40%, 50%, and 60% fly-ash content. Atterberg limits and grain size distribution tests were conducted to classify the soil. Unconfined compression test was conducted with air-dry curing periods of 0, 2, 8, and 28 days to determine the strength. Curing periods help understand the strength gained with time. It is obvious from the study that the optimum soil to fly-ash mixture was a mixture of soil and 50% fly-ash which is expected to perform better as subgrade materials for a curing period of 8 days; however, a mixture of soil with 40% fly-ash content could also be used as a viable alternative for the same curing period.

  • Open Access

    Articles

    Article ID: 85

    pH–Assisted Strength Gain Projection for Green Cement Mortar Composite Containing Marble Powder By-Product: Substitution and Intergrinding Methods

    by Mehmet S KIRGIZ

    Insight - Civil Engineering, Vol.2, No.1, 2019; 1479 Views, 49 PDF Downloads

    DOI: https://doi.org/10.18282/ice.v2i1.85

    This manuscript reports the effects of substitution and interground of MP on the pH of cement and bending and compressive strengths of mortar composite as well as strength projection of green mortar composite from pH of green cement. It also presents the relationships between pH of cement and strength of mortar composite to compute strength gain from pH of cement. The feature of sample made with MP–cement is examined and compared to those made with pure Portland cement– including bending and compressive strengths at 7d, 28d, and 90d, and pHs of cement. Projection of strength gain from pHs of cement is also discussed, and the numeric equations, the coefficients, and the r squares, which are essential elements of the strength projection, are given in the experimental study proficiently. Regularly, this study results indicate that the projection for strength gains of green mortar composite could be computed from pHs of green cement properly.