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This report defines strain-hardening cement-based composites (SHCC) and describes the principles. The scope of the report is fine-grained SHCC with moderate fibre volume content, yet tight crack control over a large strain range. Durability is achieved through crack width limitation. The report layout facilitates SHCC characterisation and durability design, with chapters on durability under mechanical, chemical, thermal and combined loads, followed by durability of structural elements and structures, and finally life-cycle considerations. 1.1 Strain-hardening cement-based composites (SHCC) It has become possible to design fibre reinforced cement-based composites to desired mechanical and non-mechanical performances. Among the various classes of high performance fibre-reinforced cement-based composites (HPFRCC) that have been developed, a particular class of generally moderate tensile strength (3 8 MPa), but with pseudo strainhardening tensile behaviour of ultra ductility is of interest here. Fibre-reinforced strainhardening cement-based composites (SHCC) exhibit superior crack width and spacing control in the pseudo strain-hardening phase, as depicted in Figure 1.1. Composites with such superior tensile response, yet low volumes of short fibre, can be engineered by tailoring the composite ingredients with the aid of micromechanically based formulations (eg. Li 1998). This has led to the terminology ‘Engineered Cementitious Composites’, or ECC by Li and coworkers for such SHCC materials. In this document the focus is on SHCC, distinguished by its ability to develop multiple, finely spaced cracks of tight crack widths, generally below 100 μm. This crack control may be exploited for its potential inherent durability and the durability it may afford structures (Li & Stang 2004).

Durability of Strain-Hardening Fibre-Reinforced Cement-Based Composites (SHCC)