Characterizing the Compressive Durability of Cement Grouts Up to Four Years-PPT Presentation

PPT Presentation

Pdf Summary

The study examined how metakaolin clay (MK) and water-to-cement (w/c) ratio affect cement grout setting times, compressive behavior, and strength over curing periods of up to four years. The work highlights the importance of reliable grout testing, given the severe consequences of cement failure in oil wells.<br /><br />Results showed that increasing the w/c ratio lengthened both initial and final setting times, while adding MK shortened them. Higher w/c ratios reduced compressive strength, whereas MK increased it. After four years, grouts containing 10% MK showed substantial strength gains compared with their seven-day strength: 99% for a w/c ratio of 0.6 and 135% for a ratio of 1.0.<br /><br />The Vipulanandan p-q model was used to describe the grouts’ nonlinear compressive stress–strain behavior. Its parameters varied with MK content, w/c ratio, and curing time. A separate Vipulanandan correlation model linked compressive strength to clay content and curing duration.<br /><br />Overall, the findings indicate that MK can improve grout strength and alter setting behavior, while the w/c ratio has significant effects on both. The models offer tools for predicting long-term grout performance.

Keywords

metakaolin

cement grout

water-cement ratio

setting time

compressive strength

curing period

oil wells

stress-strain behavior

Vipulanandan model

long-term performance