Title:
Internal Curing of Calcium Sulfoaluminate Cement Concrete Using Lightweight Aggregate
Author(s):
Royce Floyd
Publication:
Web Session
Volume:
ws_F24_RoyceFloyd.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
11/3/2024
Abstract:
Calcium sulfoaluminate (CSA) cement is an alternative, hydraulic cement that can be formulated to produce rapid setting and shrinkage compensating concrete. Production of CSA cements requires less energy and releases less carbon dioxide compared to conventional portland cement. This cement also requires approximately twice as much water as conventional portland cement for proper hydration and careful curing is required to achieve proper performance, especially relative to expansion. Therefore, introduction of internal curing water from presoaked lightweight aggregate has the potential for positive effects on the performance of CSA cement concrete. This presentation describes an initial study that examined concrete made using three CSA cements and portland cement with three different amounts of internal curing water added to each mix design using presoaked lightweight aggregate. The effect of internal curing on performance was evaluated using measurements of compressive strength, permeability, and shrinkage. The introduction of internal curing resulted in increased compressive strength and a reduction in shrinkage for all CSA cements examined. The shrinkage compensating concrete made with expansive CSA cement exhibited the most improvement in performance from adding internal curing water. In addition to the initial study, ongoing work on behavior of internally cured shrinkage compensating concrete made with expansive CSA cement is also described.