4. Experimental results obtained with different types of concrete

#### 4.1 Composition of concretes tested under QOC tests

QOC experiments have been conducted and applied to different kinds of concretes, mortars, particle-reinforced mortars, microconcrete and high-strength concrete with the sample dimensions mentioned in Table 1. Their composition, the


water to cement (plus silica fume) ratio and the maximum aggregate size of the different tested materials are gathered in Tables 4 and 5. The most important

Investigation of the Quasi-Static and Dynamic Confined Strength of Concretes by Means…

The benefits of alumina particles as reinforcement in two mortars were investigated in [6, 31, 32] by means of quasi-oedometric compression tests performed considering seven microstructures containing or lacking angular or spherical alumina particles. The tests showed a highly beneficial effect of the presence of particles with respect to both the deviatoric strength and the compaction law in both mortars (with and without silica fume) as illustrated in Figure 10, while more conventional tests (3-point bending and simple compression) did not show a such beneficial effect [40] (especially for the matrix without silica fume), proof that the strength of concretes not under confinement is not indicative of the behavior of the same materials under confined loadings. It was also found that the deviatoric strength was more favored by angular particles than by spherical ones and by the addition of silica fume in the

Quasi-oedometric compression tests applied to MB50 microconcrete [16]. (a) Deviatoric behavior and (b) hydrostatic behavior in four dynamic tests performed on dried or wet specimens. (c) Deviatoric behavior and (d) hydrostatic behavior in quasi-static and dynamic tests performed on wet specimens (V8.5 and V11

corresponding to the striking velocities equal to 8.5 m/s and 11 m/s respectively).

results obtained from QOC tests are reported in the next subsections.

DOI: http://dx.doi.org/10.5772/intechopen.89660

4.2 Influence of alumina particles used as mortars reinforcement

Figure 11.

81

## Table 4.

Composition of mortars and particle-reinforced mortars with and without silica fume used in [6, 31, 32, 40].


#### Table 5.

Composition of microconcrete (MB50), siliceous aggregate ordinary concrete (R30A7) and limestone aggregate ordinary concrete (LC), siliceous aggregate high strength concrete (HSC) used in [16, 30, 34, 35].

#### Figure 10.

Quasi-oedometric compression tests applied to a mortar M2 reinforced or not with aggregates (M2M) [6]. (a) Deviatoric behavior. (b) Hydrostatic behavior.

Investigation of the Quasi-Static and Dynamic Confined Strength of Concretes by Means… DOI: http://dx.doi.org/10.5772/intechopen.89660

water to cement (plus silica fume) ratio and the maximum aggregate size of the different tested materials are gathered in Tables 4 and 5. The most important results obtained from QOC tests are reported in the next subsections.
