Summary Report of Experimental Study on Dehydration Crack Appearing in the Construction of Turpan Civil Airport Cement Concrete Pavement - The Issues and Discussion of Modern Concrete Science - page 231

(c) Experimental section which employed admixture.

The first slab: 3 cracks; the overall length was 12 cm.

The second slab: 7 cracks; the overall length was 57 cm.
The third slab: No crack.
The fourth slab: 2 cracks; the overall length was 5 cm.
The

fifth slab: No cracks.
The sixth slab: No cracks.

Figure 16.17 shows photographs of the first slab (three clear cracks) and the

second slab ( ne and short crack).

Twelve cracks were found in experimental section which employed admixture,
and their total length was 74 cm.

16.3.5 Experiment on Penetration Speed

During the curing process, crews that were responsible for curing found that pen-
etration speed of concrete which was treated by troweling machine was much

Fig. 16.17 Cracks on slab
which employed admixture
and napping technology