Abstract
The purpose of the investigation is the use of a residual material through its recovery in a concrete mixer located in the town of Ixtaczoquitlan, Ver., Mexico, to make a recycled hydraulic mortar of f´c 70 kg/cm<sup>2</sup> for masonry works, providing sustainability to the concrete mixer and to determine its compressive strength compared to a normal mortar. The methodology consists of the recovery of a sample of fine waste of concrete from the treatment plant in CAGSA (Constructoras Asociadas del Golfo S. A. de C. V.), to dry it, classify it and then make mixtures with % fine waste-% mine sand (in a percentage ratio of 10%-90%, 20%-80%, 30%-70%, 40%-60%, 50% -50% and 60% -40%), as well as, water and cement, to later compare the results against a sample control and evaluate its compressive strengths. The results of compatibility with the other materials that make up the mortar are favorable and benefit its homogeneity and fluidity. The best compression strengths are mixtures at 10% -90%, and 20% -90%. In conclusion, this residue is compatible with the materials that make up the mortar and can be used to glue partitions and masonry plaster. Within the new and relevant aspects of the study is confirmation of the use of a new mortar from fine concrete waste, mixed with andesite-type mine sand, strengthening the sustainability of the environment. It was investigated that the analyzed residues contain 90% of Calcium, which is used in the manufacture of accelerating additives for concrete, based on calcium chloride. It can be a raw material to make additives that accelerate resistance. Follow-up research is recommended regarding the slump test, fluidity, compressive strength, consistency, and water retention of this type of mortar with fine recycled aggregate.
Highlights
As part of a sustainability strategy taken at the global level, the actions of recycling and reusing any material are of relevant importance in order to guarantee the inheritance of a livable world to our descendants
Author: Gilberto and Monica [10], Material investigated: Recycled fine aggregate, Type of mortar: Hydraulic mortar cement-sand, Specimen resistance at 28 days: 13.5 MPa according to Brazilian standard NBR7215 and 14.3 MPa according to the MDE method, best result to compression at 28 days: 14.3 MPa, Percentage of mixtures: 0%, (20%-80%) and (40%-60%), Conclusion: The partial replacement of the NFA with the MFRA using the MDE sequence gave the best results
According to the quantitative research carried out and the laboratory results obtained, it is concluded that a mixture of sand of andesitic origin with the material recovered in the dry state, combined with each other, may be feasible to be used as raw material, for the elaboration of a cement-sand mortar for a compressive strength of 70 kg/cm2, according to the percentages of 90% sand-10% recovered material, 80% sand-20% recovered material and 70% sand-30% recovered material, which are the most favorable results of the laboratory tests carried out, since the proportions 60% sand-40% recovered material, 50% sand-50% recovered material, and 40% sand- 60% -recovered material, gave results with more disadvantage for the mortar. (See Table 11 and Figure 4)
Summary
As part of a sustainability strategy taken at the global level, the actions of recycling and reusing any material are of relevant importance in order to guarantee the inheritance of a livable world to our descendants. Civil Engineering and Architecture 9(6): 1938-1954, 2021 deposit, in addition to using the waste for proper recycling and reuse, mitigating energy costs; this leads to cleaner technologies that correspond to sustainability requirements. In this regard, Elizabeth [3] opportunely points out that this increase in waste occurs due to the increase in population, which, when demanding new construction, originates a large amount of solid waste, including construction waste (RC) the construction industry is an area of opportunity because it generates a significant amount of waste that can be recycled and reused in new works. It can be extracted directly from the sites or from the construction and demolition materials once they have been separated
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