Evaluation of water absorption and chloride ion penetration of rice straw ash and microsilica admixed pavement quality concrete

Pandey, Arunabh; Kumar, Brind

doi:10.1016/j.heliyon.2019.e02256

Cited by 26 publications

(11 citation statements)

References 28 publications

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“…There are different ways available in literature to test the capacity of concrete to absorb water like saturated water absorption test, water sorptivity test, etc. [60] [61]. The procedure to determine the coefficient of permeability ('k') provided in IS 3085 [37] was followed in this study, and its values for all concrete samples are shown in Figure 14.…”

Section: Water Permeabilitymentioning

confidence: 99%

Study on Coarse Recycled Concrete Aggregate

Singh¹,

Nayak²,

Kumar³

et al. 2022

cea

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The use of recycled concrete aggregate (RCA) is one of the best solutions to mitigate the problem of ecological instability created by concrete waste. RCA has less crushing strength, impact resistance, specific gravity, and more water absorption capacity than the natural aggregate (NA). To overcome the compromised properties of RCA, a comprehensive study supported by the experimental investigation is required. This paper prescribes a methodology based on experimental investigation for the use of coarse-RCA (C-RCA) of size (4.75-20mm) as 100% replacement of coarse-NA in fresh concrete. A "remodified two-stage mixing approach (R-TSMA)" supported by a physical treatment method is proposed here to increase the bond strength between RCA and new mortar. Micro-structure of RCA-C has been studied via optical microscope as well as Scanning Electron Microscope (SEM). Effect of parent concrete quality is influential only at early curing age (7 and 14 days), but after 28 days of curing its influence reduced, such that RCA-C sample showed 5% higher compressive strength and about 4% higher in flexural strength than NA-C. At 90 days of curing, all RCA samples showed higher compressive and flexural strength than NA-C. Similarly, carbonation curing enhanced the strength of RCA-C by higher margin than NA-C.

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Section: Water Permeabilitymentioning

confidence: 99%

Study on Coarse Recycled Concrete Aggregate

Singh¹,

Nayak²,

Kumar³

et al. 2022

cea

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“…As shown in Tables 5-7, based on granulations of three types of Shootar materials, the most suitable mixing design that agrees well with the specifications was selected. The design had the following ingredients: (1) crushed gravel (12-25) mm, 30% by weight; (2) broken gravel (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) mm, 30% by weight; (3) natural washed sand (0-8), 40 mm by weight; (4) the mixing plan is done according to the specifications shown in Table 5; (5) consumable cement is considered type-II from Tehran-Iran cement factory having a 400 kg per cubic meter grade; (6) the water-cement ratio 38% obtained with an average slump of 65 mm from Mahshahr-Iran water. It must be pointed out that the mixing scheme was drawn up on the basis of specifications seen in Table 5.…”

Section: Mixing Ratiosmentioning

confidence: 99%

“…Bagheri et al [6] conducted a number of experiments and observed that concrete electrical resistance could increase five times by replacing 12% microsilica with cement. Pandey and Kumar [7] performed an evaluation on the water absorption, and chloride ion penetration of rice straw ash and microsilica admixed pavement quality concrete. They derived two equations for both the initial and secondary rate of water absorption.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Chloride-Induced Corrosion of Microsilica and ECC in the Offshore Piers' Concrete (Case Study: Wharves P3 & P4 of Imam Khomeini Petrochemical)

Tangtakabi¹,

Ramesht²,

Pahlaviani³

2021

EAS

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The corrosion of reinforcements in the tidal zone leads to significant damage to offshore concrete piers. To overcome such damages, the quality of concrete and its mechanical properties should be improved. The aim of the present study is to identify and evaluate the causes and extent of corrosion observed in piers P3 & P4 in Imam Khomeini petrochemical. The concrete reinforced by microsilica and the ECC concrete are used to prevent corrosion. Some tests were conducted to determine the conditions of concrete piers in terms of reinforcement corrosion. Then, a reinforcement corrosion intensity test using Potentiostat involving a placement process was used, where the water-to-cement ratio was 38%; superplasticizers was 4%; and microsilica was 10% and 15%. The microsilica can serve as an alternative to the consumed cement and was measured according to the ASTM standards; Besides, it was exposed to aggressive conditions at different periods, and a concrete compressive strength test was performed. The results show that the compressive strength of concrete with microsilica 15% is nearly 25% higher than that of ECC, while for the control specimen, this value is about 42%. Regarding the corrosion intensity, the concrete with microsilica 15% has the minimum value compare to all three other samples. It is recommended to use this type of concrete to overcome the corrosion problem in piers P3 & P4 in Imam Khomeini petrochemical.

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“…Automatically, concrete-containing large silica particles are more resistant to corrosion attack. On the contrary, in concrete made with the addition of a water-entraining agent [18], chloride ions enter into concrete more easily, especially in young concrete [19,20]. Corrosion attack on the concrete reinforcement surface causes cracks on the surface of concrete and a decrease in bonding force of reinforcement.…”

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confidence: 99%

Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders

et al. 2020

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This work aims to study the effect of Ca(C 18 H 35 O 2 ) 2 (calcium stearate) on the properties of concrete by using Portland composite cement (PCC) and fly ash as binders. The calcium stearate content used in the concrete here consists of 0, 1, 5, and 10 kg per m 3 of concrete volume, or alternatively, 0 to 2.85% by the weight of cement. We have performed several tests for each of the contents, namely, compressive strength, water absorption, chloride ion infiltration, and accelerated corrosion tests. According to the testing, we have found that with the addition of calcium stearate at 1 kg/m 3 in self-compacting concrete (SCC) with 10% fly ash, the mechanical and physical properties of SCC can be improved significantly when compared to the SCC without fly ash and calcium stearate, resulting in a stable compressive strength, lower water absorption, lower chloride ion infiltration, and lower degree of corrosion attack.Materials 2020, 13, 1394 2 of 16 calcium silicate hydrate mineral referred to as C-S-H (tobermorite) [9]. Calcium hydroxide itself is one of the compounds formed when tricalcium silicate (C3S), dicalcium silicate (C2S), or tricalcium aluminate (C3A) reacts with water (H 2 O). The use of fly ash in concrete as a substitute for cement further increases the amount of C-S-H/calcium silicate hydrate (tobermorite) formed during the cement hydration process. It can reduce cement the consumption by 3.2-5 kg·m −3 ·MPa −1 [10]. In the process of cement production, millions of tons of CO 2 gas (a pollutant) is released because of combustion to make clinker. Reducing cement consumption in concrete consequently decreases the CO 2 emissions. Besides that, the appearance of fly ash in concrete also raises the alkalinity of concrete [11]. The higher the alkalinity of concrete, the greater the passive layer protected steel bar in concrete is from corrosion attack.Not only additives such as fly ash, slag, and silica fumes, but superplasticizers such as water reducers [12] in concrete also can reduce the capillaries and pores [13] in concrete. Although the water/cement ratio used in concrete is very small, the workability of fresh concrete remains good, and this is easily maintained by adding a superplasticizer to the concrete [14]. Because of the low water/cement ratio used, autogenous shrinkage is reduced. Other effects include increasing the elastic modulus [15] and raising the anti-carbonation of the concrete [16].A large contact angle makes it more difficult for water to seep into concrete [17]. As a result, the water absorption of concrete also drops significantly. Furthermore, in general, chloride ions penetrate into concrete along with water because of the greater contact angle. Automatically, concrete-containing large silica particles are more resistant to corrosion attack. On the contrary, in concrete made with the addition of a water-entraining agent [18], chloride ions enter into concrete more easily, especially in young concrete [19,20]. Corrosion attack on the concrete reinforcement surface causes cracks ...

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Evaluation of water absorption and chloride ion penetration of rice straw ash and microsilica admixed pavement quality concrete

Cited by 26 publications

References 28 publications

Study on Coarse Recycled Concrete Aggregate

Study on Coarse Recycled Concrete Aggregate

Comparison of Chloride-Induced Corrosion of Microsilica and ECC in the Offshore Piers' Concrete (Case Study: Wharves P3 & P4 of Imam Khomeini Petrochemical)

Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders

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Evaluation of water absorption and chloride ion penetration of rice straw ash and microsilica admixed pavement quality concrete

Cited by 26 publications

References 28 publications

Study on Coarse Recycled Concrete Aggregate

Study on Coarse Recycled Concrete Aggregate

Comparison of Chloride-Induced Corrosion of Microsilica and ECC in the Offshore Piers&apos; Concrete (Case Study: Wharves P3 & P4 of Imam Khomeini Petrochemical)

Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders

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Comparison of Chloride-Induced Corrosion of Microsilica and ECC in the Offshore Piers' Concrete (Case Study: Wharves P3 & P4 of Imam Khomeini Petrochemical)