A comparative study based on experimental results of masonry wallettes subjected at vertical compression for various loading rates is herein presented. The specimens were made with general purpose mortar and two material groups: dense and lightweight concrete blocks. The loading rates were established as moderated (according to Mexican Regulations), slow (50% slower than the moderated rate) and fast (50% faster than the moderated rate). The presented results are mean compressive stress-strain relationships from three specimens tested at the same rate. The main individual properties of mortar and blocks were also investigated. This investigation shows that the compressive strength can vary about 11% among the group of specimens made of normal concrete blocks tested at different rates, meanwhile this variation of the wallettes made of lightweight concrete blocks is approximately 11.24%. Therefore, this change in the compressive strength of masonry structures needs to be considered when designing future masonry structures.
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