He mechanical properties of cement and adjust the bearing capacity. Thus
He mechanical properties of cement and modify the bearing capacity. Hence, the compression tests below unique circumstances are carried out to study its traits law together with the temperature. five.1. Samples Preparation The samples have been produced of G-grade oil properly cement, mixed using a certain proportion of silica powder (200 mesh), fluid loss reducer, SFP (a sort of cement admixture) and water. It’s a formula suitable for high temperature formation. The detailed proportion is shown in Table 1. Then, the resulting cement paste was poured and molded inside a cylindrical mold. In an effort to simulate the temperature and Nitrocefin supplier Stress environment of cement hydration and hardening in the deep part of the ground, the specimens had been maintained inside a water bath at a temperature of 130 C and a pressure of 20.7 MPa for 72 h, and immediately after maintenance, they had been cooled inside a water bath at 27 C 3 C and stored.Energies 2021, 14,eight ofTable 1. Formula of cement slurry technique. Cement Slurry System Formula G-grade oil properly cement 35 SiO2 (silica powder) 6 SFP-1 four DZJ-Y (fluid loss reducer) 0.two SFP-2 42 H2 OHigh temperature and high-pressure resistant formulaAfter the specimen upkeep is completed and demolded, further processing is essential to make sure that: 1. the error of non-parallelism of each ends of your specimen is not extra than 0.05 mm, 2. along the height on the specimen, the error on the diameter is not extra than 0.three mm, 3. the finish face is perpendicular for the axis from the specimen, the maximum deviation isn’t additional than 0.25 . 5.two. Tests Final results and Analysis The specimens had been subjected to compression experiments at distinct temperatures of 25.95 and 130 C. The test parameters and results are shown in Table two. The strain train curves with the experiments plus the damage morphology with the specimens are shown in Figures 2.Table two. Specimen parameters and experimental outcomes. Diameter (mm) 49.89 50.01 50.06 49.92 49.89 49.96 50.07 50.01 49.89 Height (mm) 99.91 100.07 99.85 99.85 one hundred.02 100.02 99.94 one hundred.00 99.93 Confining Pressure 3 (MPa) 0 15 25 0 15 25 0 15 25 13 (MPa) 39.80 63.23 81.50 30.96 56.89 76.02 19.98 47.11 70.94 E (GPa) four.85 six.86 9.90 4.32 five.96 8.14 3.01 three.96 five.81 Temperature ( C) 25 25 25 95 95 95 130 130Sample Number C-1-2 C-1-7 C-1-8 C-1-3 C-1-10 C-1-18 C-1-5 C-1-6 C-1-0.152 0.133 0.121 0.124 0.111 0.103 0.097 0.075 0.MRTX-1719 web Figure 2. Compression test at 25 C. (a) Stress train curves; (b) samples morphology right after test.Energies 2021, 14,9 ofFigure three. Compression test at 95 C (a) Pressure train curves; (b) samples morphology soon after test.Figure 4. Compression test at 130 C (a) Tension train curves; (b) samples morphology following test.The relationship in between compressive strength 1 and confining stress three is established according to the experimental final results as shown in Figure five, by way of which the cohesion and internal friction angle of sheath at various temperatures may be calculated making use of Equations (22) and (23). k-1 = arcsin (22) k+1 c= c (1 – sin) 2cos (23)where k could be the slope of your fitted curve and c could be the intercept on the fitted curve. The results from the fitted junction are shown in Table two, plotted as a scatter plot and fitted with a easy quadratic curve within the Figure 6, the approximate laws of cohesion and internal friction angle of sheath with temperature can be roughly obtained.Energies 2021, 14,10 ofFigure five. Fitting curve of confining stress and 1 at distinct temperatures.Figure six. The connection in between cohesion, internal friction angle.
