Experimental Study on the Effect of Limestone Powder Content on the Dynamic and Static Mechanical Properties of Seawater Coral Aggregate Concrete (SCAC)

Abstract

The development of island construction concrete can serve as a basis for the development and utilization of island resources. Complying with the principle of using local materials to configure seawater coral aggregate concrete (SCAC) that is able to meet the requirements of island and reef engineering construction could effectively shorten the construction period and cost of island and reef engineering construction. In this paper, quasi-static mechanical experiments and dynamic mechanical experiments were carried out on SCAC with different limestone powder contents. High-speed photography technology and Digital Image Correlation (DIC) were used to monitor the dynamic failure process and strain field of SCAC, and the influence of limestone powder content on the dynamic and static mechanical properties of SCAC was investigated. The results showed that, when the limestone powder content was 20% and 16%, the quasi-static compressive strength and quasi-static tensile strength exhibited the best improvement. Additionally, with increasing limestone powder content, the dynamic tensile strength of SCAC first showed and increasing trend and then a decreasing trend, reaching its maximum value when the limestone powder content was 16%. Moreover, the maximum strain value of SCAC with the same limestone powder content increased with increasing strain rate grade, showing an obvious effect on strain rate.

Effect of PVA Fiber on the Mechanical Properties of Seawater Coral Sand Engineered Cementitious Composites

“…Figure 6 shows the stress–strain curve under uniaxial compressive. Four stages can be distinguished from the curves [ 3 ]: initially, a compacting stage, followed by elasticity, then the cracking stage, and, finally, the failure stage. In the compacting stage, because there are fine cracks inside the concrete that close under the action of external forces, the curve shows a slow upward trend.…”

“…Coral concrete represents an innovative building material created from coral sand, cement, admixtures, and mineral admixtures, all blended according to a specific mixing ratio [ 1 ]. It has already showcased benefits such as reduced construction timelines and lower costs in defense and maritime infrastructure development [ 2 , 3 ]. Nevertheless, coral concrete exhibits a degree of brittleness and susceptibility to cracking [ 1 , 4 ].…”

Effect of Coarse Aggregate Grading on Mechanical Parameters and Fracture Toughness of Limestone Concrete

“…Tests of fracture toughness of limestone rocks from which an aggregate for the production of concrete is obtained-assessed at static [34] and dynamic loads [35];…”