Wienerberger (G) (perforated)

Wienerberger (G) (perforated)

Figure 4. Overview of trowel shapes used in experiments. The type on the left was used by the Dutch mason; the type on the right by the French mason; the others by Belgian masons.

work with his own tools, which lead to the use of a variety of trowels (Fig. 4).

In the first section of the programme, with quarry sand, the binder to aggregate ratios (B:A) were fixed, and the water to binder ratios (W:B) were left free for the masons to choose. All ratios are given in mass proportions. The B:A were derived from a practice-based reference.

Batches of approximately 35 litres were mixed in a floor-model Hobart mixer type M80. Approximately 75% of the estimated needed water quantity was poured in the bowl, then half of the aggregate, the binder, and the other half of the aggregate was added. Mixing was done at low speed, while water was added by the mason, until the water content and homogeneity were considered optimal. The amount of added water is weighed and the consistence of each composition is measured immediately by plunger penetration

± Standard deviation


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