Mechanical and microstructural properties of high-performance concrete made with rice husk ash internally cured with superabsorbent polymers

Nduka, David O.; Olawuyi, Babatunde J.; Fagbenle, Emmanuel O.; Fonteboa, Belén G.

doi:10.1016/j.heliyon.2022.e10502

Cited by 11 publications

(5 citation statements)

References 65 publications

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“…Mixing 10%, RHA can increase high-strength concrete of compressive strength, splitting strength, and flexural strength. XRD and SEM/EDS results prove the lower amount of calcium hydroxide and the formation of C-S-H [9]. Using RHA in concrete increases flexural strength, but if the w/c ratio is increased, it will decrease the flexural strength.…”

Section: Introductionmentioning

confidence: 86%

Mechanical and Microstructural Properties of Green Roof Slab Under Acid Rain Attack

Ahmad

Pertiwi

Taufieq

2023

IOP Conf. Ser.: Earth Environ. Sci.

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A flat slab is widely used as an alternative form of a house roof. The roof work does not take long. Its simple structure is beautiful to homeowners with a minimalist concept. Because this slab does not use a roof covering, it is very susceptible to the influence of the sea. Damage often occurs. Acid rain causes the concrete to become porous as slab material. This investigation aims to produce a durable roof slab to solve existing problems. The test object used was a reinforced concrete slab of 30cmx60cmx15cm. Three types of compressive strength were used, namely 20 MPa, 30 MPa, and 35 MPa. At the same time, the green concrete concept is used by replacing some of the cement with rice husk ash. The effect of acid rain was carried out by immersing the specimens in an acid solution for 28 days, 90 days, and 120 days. All samples were tested for flexural strength for their mechanical properties and XRD for microstructural properties. The results show that the roof slab with rice husk ash can reduce the damage that occurs due to the influence of acid. At the same time, gypsum and calcium oxide content can show the phenomenon of slab damage.

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Section: Introductionmentioning

confidence: 86%

Mechanical and Microstructural Properties of Green Roof Slab Under Acid Rain Attack

Ahmad

Pertiwi

Taufieq

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Biskri et al [ 20 ] noted that the optimal cement replacement rate of GGBFS was 20%. In another study, Nduka et al [ 21 ] used rice husk ash and a low water-to-binder (W/B) ratio of 0.3 to produce HPC. The results indicated that a 10% substitution using rice husk ash was optimal.…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties of Green and Ecofriendly Grouting Materials with Different Sand Filling Ratios

Juang

Kuo

2023

Materials

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With the active development of offshore wind power worldwide, the development of a green and ecofriendly grouting material (GEGM) has garnered global attention. Such a material must also be developed in Taiwan. Therefore, in this study, a series of environmentally friendly recycled materials were mixed in different proportions to develop a GEGM which can be implemented in the future construction of offshore wind turbines. To evaluate the mechanical properties of the GEGM, low water-to-binder (W/B) ratios (i.e., 0.21, 0.27, and 0.35) were used; cement was replaced with fixed amounts (20%) of ground granulated blast-furnace slag and fly ash; 2%, 2.5%, and 3% superplasticizers (SPs) were added; and two levels of sand content (60% and 70%) were used. The setting time of the GEGM was used to evaluate its workability; its compressive strength and flexural strength were used to evaluate its mechanical properties; and its sulfate resistance, length changes, and four-terminal resistance were used to evaluate its durability. The relationship between the durability and drying shrinkage of the GEGM was subsequently evaluated, and the ratio of final to initial setting times (F/I value) was calculated to determine the effects of the amount of SP added on workability. The highest F/I value (7.7) was achieved when 2 wt.% modified lignin sulfonate (MLS) was added because of the high viscosity of MLS, which compromised the workability of the concrete. The optimal compressive strength (83.62 MPa) was achieved when a W/B ratio of 0.21 was used, when the sand content was 70%, and when a 2% polycarboxylate superplasticizer (PCE) was added, whereas the optimal flexural strength (20.86 MPa) was achieved when 2.5% PCE was added. According to the nondestructive test results and the R2 value (>0.7) obtained from regression analyses of mechanical properties, the study results are reliable and may serve as a reference for future construction projects.

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“…However, the building industry’s growing need for renewable and ecological materials necessitates the exploration of substitute materials [ [20] , [21] , [22] , [23] , [24] , [25] ]. Numerous hardwood [ 2 , 18 , [26] , [27] , [28] ] and softwood [ 3 , [29] , [30] , [31] , [32] ] species have been examined by various researchers to determine whether they are suitable for the synthesis of glulams.…”

Section: Introductionmentioning

confidence: 99%

Physical and mechanical properties of Albizia procera glulam beam

Das¹,

Islam²,

Ghosh³

et al. 2023

Heliyon

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Mechanical and microstructural properties of high-performance concrete made with rice husk ash internally cured with superabsorbent polymers

Cited by 11 publications

References 65 publications

Mechanical and Microstructural Properties of Green Roof Slab Under Acid Rain Attack

Mechanical and Microstructural Properties of Green Roof Slab Under Acid Rain Attack

Engineering Properties of Green and Ecofriendly Grouting Materials with Different Sand Filling Ratios

Physical and mechanical properties of Albizia procera glulam beam

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