“…In contrast to NS and NA, increasing amounts of waste expanded polystyrene 100 and ethylene-vinyl acetate 101 are added to concrete, resulting in a significant decrease in density. Similar to our results, Behera and Rahman showed that adding RHA decreased concrete density 102 . Figure 9 Relationship between compressive strength and density after 28 days for different percentages of RHA.…”
Various studies have been recently conducted aiming at developing more sustainable cementitious systems so that concrete structures may not have a negative effect on the environment and are decomposed. It has been attempted to build sustainable binders by substituting silica fume, cement with fly ash, nano-silica, nano-alumina, and rice husk ash. In this paper, a series of experiments on concrete with different contents of rice husk ash (10%, 15%, and 20%), nano$${{\hbox {SiO}_2}}$$
SiO
2
(1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%), and nano$$\hbox {Al}_{2}{\hbox {O}}_{3}$$
Al
2
O
3
(1%, 2%, 3%, 4%) are performed to analyze the durability and mechanical properties of samples under the curing condition of Caspian seawater. The workability, density, water penetration, chloride ion penetration, and compressive strength (at 7, 14, 28, and 90 day) of the samples were determined. The experimental results showed that workability decreased gradually with increasing additives content, while the compressive gradually increased. Among the additives, adding 8% of the nano$${{\hbox {SiO}_2}}$$
SiO
2
had the most significant effect on the improvement of compressive strength. Adding 8% nano$${{\hbox {SiO}_2}}$$
SiO
2
and 4% nano$$\hbox {Al}_{2}{\hbox {O}}_{3}$$
Al
2
O
3
reduced the depth of water permeability by 53% and 30%, respectively. Furthermore, adding 8% nano$${{\hbox {SiO}_2}}$$
SiO
2
reduced chloride ion penetration by 85%.
“…In contrast to NS and NA, increasing amounts of waste expanded polystyrene 100 and ethylene-vinyl acetate 101 are added to concrete, resulting in a significant decrease in density. Similar to our results, Behera and Rahman showed that adding RHA decreased concrete density 102 . Figure 9 Relationship between compressive strength and density after 28 days for different percentages of RHA.…”
Various studies have been recently conducted aiming at developing more sustainable cementitious systems so that concrete structures may not have a negative effect on the environment and are decomposed. It has been attempted to build sustainable binders by substituting silica fume, cement with fly ash, nano-silica, nano-alumina, and rice husk ash. In this paper, a series of experiments on concrete with different contents of rice husk ash (10%, 15%, and 20%), nano$${{\hbox {SiO}_2}}$$
SiO
2
(1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%), and nano$$\hbox {Al}_{2}{\hbox {O}}_{3}$$
Al
2
O
3
(1%, 2%, 3%, 4%) are performed to analyze the durability and mechanical properties of samples under the curing condition of Caspian seawater. The workability, density, water penetration, chloride ion penetration, and compressive strength (at 7, 14, 28, and 90 day) of the samples were determined. The experimental results showed that workability decreased gradually with increasing additives content, while the compressive gradually increased. Among the additives, adding 8% of the nano$${{\hbox {SiO}_2}}$$
SiO
2
had the most significant effect on the improvement of compressive strength. Adding 8% nano$${{\hbox {SiO}_2}}$$
SiO
2
and 4% nano$$\hbox {Al}_{2}{\hbox {O}}_{3}$$
Al
2
O
3
reduced the depth of water permeability by 53% and 30%, respectively. Furthermore, adding 8% nano$${{\hbox {SiO}_2}}$$
SiO
2
reduced chloride ion penetration by 85%.
“…The compressive strength of SCHPC reached 130 MPa after 56 days [15]. Recent studies found that incorporating RHA to concrete mixture will improved the strength capacity up to 25% [16]. Gull et al [13] recommends the recycling of the wastes concrete in concrete production and suggested to further study the development and improvement of concrete wastes as a recycled aggregates for better performance and include the financial analysis.…”
This study aimed to assess the strength characteristics of concrete using Recycled Concrete Aggregates (RCA) as full replacement to coarse aggregates and Rice Husk Ash (RHA) as an admixture. The concrete samples were subjected to curing for 7, 14, and 28 days. Specifically, the study evaluated the workability of freshly mixed concrete and compared the compressive and flexural strength with RCA and RHA to normal concrete. Four different treatment mixtures were used with three replicates with varying ratio of RHA to cement: Treatment 1 (1 cement: ¾ RHA), Treatment 2 (1 cement: ½ RHA), Treatment 3 (1 cement: ¼ RHA). In all cases, RCA completely replaced natural coarse aggregates. The results indicated that the slump which measures the workability of the RCA concrete met the desired standard specifications. Additionally, the RCA concrete with the highest RHA content obtained the highest compressive and flexural strength on the 28th day test but did not exceed the control. Furthermore, the study revealed that the concrete specimens could handle maximum loads for flexure rather than compression load.
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