## 3 Results and Discussion  
### Compressive Strength  
Tables 4 and 5 show the ANOVA results for compressive strength after curing times of 28 and 365 days, respectively. For test specimens with a 28-day curing time, it can be stated that the type of cement, the amount of foam, and the interaction between the factors showed a significant influence with 95% reliability. As for the type of additive, its influence cannot be quantified. Note that the amount of foam was the factor that most influenced compressive strength, its contribution being 39%. The type of cement also influences the compressive strength; its contribution is 13%. Also, note that there was an interaction between the factors, which corresponds to the difference in behavior of a given factor due to the different levels of another factor. After the specimens had been cured for 365 days, it was observed that all the factors had a significant influence on the resistance to compression with 95% reliability, including the type of additive, which presented a contribution of 9%. \begin{table}
\begin{tabular}{c c c c c c c} \hline
**Order** & **Cement Type** & **Cement (kg)** & **Additive** & **Foam (kg)** & **CCW (kg)** & **Water (kg)** & **w/c Ratio** \\ \hline
1 & CP V-ARI & 1.8 & No additive used & 0.25 & 1.8 & 0.57 & 0.45 \\
2 & CP V-ARI & 1.8 & Plasticizer & 0.25 & 1.8 & 0.57 & 0.45 \\
3 & CP V-ARI & 1.8 & Superplasticizer & 0.25 & 1.8 & 0.57 & 0.45 \\
4 & CP V-ARI & 1.8 & Air entrainment & 0.25 & 1.8 & 0.57 & 0.45 \\
5 & CP V-ARI & 1.8 & No additive used & 0.34 & 1.8 & 0.48 & 0.45 \\
6 & CP V-ARI & 1.8 & Plasticizer & 0.34 & 1.8 & 0.48 & 0.45 \\
7 & CP V-ARI & 1.8 & Superplasticizer & 0.34 & 1.8 & 0.48 & 0.45 \\
8 & CP V-ARI & 1.8 & Air entrainment & 0.34 & 1.8 & 0.48 & 0.45 \\
9 & CP V-ARI & 1.8 & No additive used & 0.43 & 1.8 & 0.39 & 0.45 \\
10 & CP V-ARI & 1.8 & Plasticizer & 0.43 & 1.8 & 0,39 & 0.45 \\
11 & CP V-ARI & 1.8 & Superplasticizer & 0.43 & 1.8 & 0.30 & 0.45 \\
12 & CP II-F & 1.8 & Air entrainment & 0.43 & 1.8 & 0.39 & 0.45 \\
13 & CP II-F & 1.8 & No additive used & 0.25 & 1.8 & 0.57 & 0.45 \\
14 & CP II-F & 1.8 & Plasticizer & 0.25 & 1.8 & 0.57 & 0.45 \\
15 & CP II-F & 1.8 & Superplasticizer & 0.25 & 1.8 & 0.57 & 0.45 \\
16 & CP II-F & 1.8 & Air entrainment & 0.25 & 1.8 & 0.57 & 0.45 \\
17 & CP II-F & 1.8 & No additive used & 0.34 & 1.8 & 0.48 & 0.45 \\
18 & CP II-F & 1.8 & Plasticizer & 0.34 & 1.8 & 0.48 & 0.45 \\
19 & CP II-F & 1.8 & Superplasticizer & 0.34 & 1.8 & 0.48 & 0.45 \\
20 & CP II-F & 1.8 & Air entrainment & 0.34 & 1.8 & 0.48 & 0.45 \\
21 & CP II-F & 1.8 & No additive used & 0.43 & 1.8 & 0.39 & 0.45 \\
22 & CP II-F & 1.8 & Plasticizer & 0.43 & 1.8 & 0,39 & 0.45 \\
23 & CP II-F & 1.8 & Superplasticizer & 0.43 & 1.8 & 0.30 & 0.45 \\
24 & CP II-F & 1.8 & Air entrainment & 0.43 & 1.8 & 0.39 & 0.45 \\
25 & CP II-Z & 1.8 & No additive used & 0.25 & 1.8 & 0.57 & 0.45 \\
26 & CP II-Z & 1.8 & Plasticizer & 0.25 & 1.8 & 0.57 & 0.45 \\
27 & CP II-Z & 1.8 & Superplasticizer & 0.25 & 1.8 & 0.57 & 0.45 \\
28 & CP II-Z & 1.8 & Air entrainment & 0.25 & 1.8 & 0.57 & 0.45 \\
29 & CP II-Z & 1.8 & No additive used & 0.34 & 1.8 & 0.48 & 0.45 \\
30 & CP II-Z & 1.8 & Plasticizer & 0.34 & 1.8 & 0.48 & 0.45 \\
31 & CP II-Z & 1.8 & Superplasticizer & 0.34 & 1.8 & 0.48 & 0.45 \\
32 & CP II-Z & 1.8 & Air entrainment & 0.34 & 1.8 & 0.48 & 0.45 \\
33 & CP II-Z & 1.8 & No additive used & 0.43 & 1.8 & 0.39 & 0.45 \\
34 & CP II-Z & 1.8 & Plasticizer & 0.43 & 1.8 & 0,39 & 0.45 \\
35 & CP II-Z & 1.8 & Superplasticizer & 0.43 & 1.8 & 0.30 & 0.45 \\
36 & CP II-Z & 1.8 & Air entrainment & 0.43 & 1.8 & 0.39 & 0.45 \\ \hline \end{tabular}
\end{table} 
Table 3: Experimental matrix. Figure 3a shows the relationship between compressive strength and cement types at different curing times (28 and 365 days). The CP II-Z cement, for curing times of 28 and 365 days, presented on average a higher compressive strength compared to other CP V-ARI and CP II-F cements. This behavior can be explained by the presence of fly ash in the CP II-Z cement.