Abstract
This paper presents the mechanical performance and durability of concrete with water/cement (w/c) ratios of 0.30 and 0.60 containing cactus mucilage and brown marine seaweed extract solutions (at 0.5° Brix concentrations). Cylindrical specimens (100 mm x 200 mm) were cast and moist-cured for 0 and 28 days. Compressive strength, rapid chloride permeability, and chloride diffusion tests were conducted to evaluate all of the concrete mixes at the ages of 60 and 120 days. In addition, accelerated carbonation tests were carried out on specimens at the age of 180 days by exposure to 23 °C, 60% RH and at 4.4% CO2 for 120 days. The compressive strength results showed that only one concrete mix with admixtures increased in strength compared to the control. Regarding the rapid chloride permeability, chloride diffusion and carbonation, the results indicated that the durability of concretes containing organic additions was enhanced compared to the control.
Highlights
RESUMEN: Influencia del mucílago de cactus y extracto de algas pardas marinas en la resistencia a compresión y durabilidad del hormigón
Based on the results of this experimental research, the following conclusions are drawn: 1. Addition of cactus mucilage and seaweed extract to concrete produced distinct effects on the mechanical properties and durability depending on the water to cement ratio
Those changes in porosity marginally affected compressive strength, being the most noticeable in concrete with a w/c ratio of 0.60 and 0 days moist-cured, where the combination of cactus mucilage and seaweed extract increased the strength at 120 days by 20% with respect to the control
Summary
RESUMEN: Influencia del mucílago de cactus y extracto de algas pardas marinas en la resistencia a compresión y durabilidad del hormigón. (12) studied Portland cement mortar with a w/c ratio of 0.60 containing lyophilized cactus gum Their results indicated a 65% compressive strength increase with respect to the control mortar at only three days of age, which is contrary to other studies in which the addition of cactus mucilage extended the setting times and negatively affected the compressive strength gain at early ages as well as at 28 days [11, 13]. Their results fail to provide a clear trend for either increasing or decreasing compressive strength with increasing lyophilized cactus gum concentration. Their results showed good corrosion inhibiting effect on reinforcing steel when chloride ions were present, especially when dehydrated nopal was used at 1% and 2% by mass
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