Figure 4
(a) Calcium hydroxide profiles. (b) Ettringite profiles. Data from time-resolved EDD experiments on the hydration of oilwell cement (with and without two typical retarders calcium gluconate; phosphonate) under ambient conditions. The calcium hydroxide production is delayed (a) by the retarders from 300–400 min (without retarder) to beyond the total experimental measurement time (620 min), whereas the change in consumption profile of ettringite is more subtle (b). |