Vol. 5 No. 1 (2022)

Open Access

Book Review

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.5, No.1, 2022; 1414 Views, 22 PDF Downloads

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.

Open Access

Book Review

Article ID: 91

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

by M A Karim

Insight - Civil Engineering, Vol.5, No.1, 2022; 1040 Views, 22 PDF Downloads

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.