Test results and discussion Dispersing efficiency

3. Test results and discussion
3.1. Dispersing efficiency and flowability retention
Fig. 1. HRWR dosages for various cement–HRWR combinations and various w/c ratios.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 2. Variation of flowability with time for mixtures made with various w/c and PNS HRWR.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 3. Variation of flowability with time for mixtures made with various w/c and PC HRWR.Figure optionsDownload full-size imageDownload as PowerPoint slide
Test results indicated that PHT-427 mixtures incorporating PC type showed higher initial flowability than those made with PNS, regardless of the w/c and cement type. Furthermore, the use of PC resulted in better flowability retention, regardless of the cement type. Indeed, better flowability retention (up to 90 min) was observed with mixtures incorporating PC than those made with PNS, especially when BC is used. For example, mixture made with PNS–BC combinations showed flowability reduction between 50% and 62% of the initial flowability after 90 min of age. In the case of PNS–OC mixtures, this reduction is limited between 15% and 31%.