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Eventually, three zones outside of the apparently unaltered cement paste become distinct: 1) An outer zone leached of most constituents (including ettringite), leaving a more porous, calcium-depleted CSH and some remnant ferrite; 2) A second zone where gypsum replaces calcium hydroxide and ettringite replaces monosulfate; and 3) A third zone with monosulfate that appears to be sulfur-rich or perhaps a mixture of ettringite and monosulfate. An advancing front separates a growing, swollen outer zone from an untouched inner zone. Visitors purchase admission tickets in this outer zone before re-entering the hollow core of the tower and rising to the 53rd storey. |
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