Durability of Concrete: Second Edition

Taylor, Peter; Tennis, Paul D.; Obla, Karthik H.; Ram, Prashant; Dam, Thomas Van; Dylla, Heather

doi:10.17226/22511

Cited by 3 publications

(4 citation statements)

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“…Durable concrete is that which resists the forces in that environment that tend to cause it to deteriorate prematurely without requiring excessive effort for maintenance [17]. Specifying durable concrete begins with identifying exposure conditions.…”

Section: Durability Of Concretementioning

confidence: 99%

Experimental Study on the Influence of Mogadishu Manufactured Sand on the Engineering Properties of Concrete

2022

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Due to the increasing demand for sand for construction activities across the world including Mogadishu Somalia, natural sand resources are growingly used up and its price is becoming increasingly high. This study aimed to research the influence of Mogadishu-manufactured sand on the engineering properties of concrete. Manufactured sand refers to fine aggregate which is less than 4.75mm. In this research, Mogadishu Manufactured sand was refined from the crushed limestone rock as a replacement for river sand. The overall objective of the study was to evaluate the influence of Mogadishu manufactured sand on the engineering properties of concrete; the specific objectives were to examine the properties of plastic and hardened concrete; to investigate the durability of concrete with Mogadishu manufactured sand. The study used manufactured sand in incomplete or complete replacement for natural sand. The basic aggregate tests considered were sieve analysis for fine and coarse aggregate, specific gravity, and water absorption was also done. Design mix of class 30 concrete having mix amount for both natural and manufactured sand was considered for the workability test (slump test and compaction factor test). The splitting tensile strength test and compressive strength test for 28 and 56 days was done. The study, in addition, considered durability testing by exposing the concrete to sodium chloride, magnesium sulphate, and sulphuric acid. Then final assessment was done to determine how these chemicals affected the concrete after 28 and 56 days of immersion. It was found that the slump and compaction factor values of the concrete mix with Mogadishu manufactured sand decreased compared to that of conventional concrete. Concrete with Mogadishu manufactured sand significantly improves the strength properties of the concrete up to 25% replacement and reduces as replacement increases. This was attributed to the presence of micro fines in the Mogadishu manufactured sand generated from limestone rock. When exposed to sulphuric acid, magnesium sulphate, and sodium chloride, the durability of concrete with manufactured sand were improved as compared to that of normal concrete with river sand. Hence from the experimental investigations, it is concluded that Mogadishu manufactured sand can be partially utilized as fine aggregate in concrete production of construction activities.

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Section: Durability Of Concretementioning

confidence: 99%

Experimental Study on the Influence of Mogadishu Manufactured Sand on the Engineering Properties of Concrete

2022

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“…1,2 The formation of cracks lowers the resistance of concrete with response to durability issues such as freezing and thawing, sulfate attacks, carbonation, and steel reinforcement corrosion. 3 Self-healing mechanisms in concrete have been investigated by researchers over the last 20 years, trying to design a mechanism capable of filling the cracks with the products coming from the concrete itself. [4][5][6][7][8] Autogenous self-healing mechanism is one of the main methods of selfhealing and is an inherent property of concrete that existed from the first time Portland cement was used in concrete.…”

Section: Introductionmentioning

confidence: 99%

“…Cracks in reinforced concrete structures are inevitable due to deformation caused by hydration shrinkage, external loading, and the environmental conditions 1,2 . The formation of cracks lowers the resistance of concrete with response to durability issues such as freezing and thawing, sulfate attacks, carbonation, and steel reinforcement corrosion 3 . Self‐healing mechanisms in concrete have been investigated by researchers over the last 20 years, trying to design a mechanism capable of filling the cracks with the products coming from the concrete itself 4–8 .…”

Section: Introductionmentioning

confidence: 99%

Effect of different exposure conditions on the self‐healing capacity of engineered cementitious composites with crystalline admixture

Mahmoodi

Sadeghian

2022

Structural Concrete

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In this study, the effect of different exposure conditions of ambient air, tap water, and seawater on two levels of crack widths in engineered cementitious composites (ECC) were investigated. Crystalline admixture (CA) was implemented in the ECC mix to promote self-healing capacity. Flexural testing on prism specimens (100 Â 100 Â 350 mm) was conducted to evaluate self-healing by recovering the stiffness in the specimens with crack widths below 200 μm. Water permeability test was also carried out to assess the crack-filling capability of ECC disk specimens (100-mm diameter Â 50-mm thickness) with single crack widths over 1 mm. Digital image correlation technique was used to monitor crack propagation patterns and crack widths. To analyze the microstructure of the healing products, X-ray diffraction test was conducted on groups of tap water and seawater exposures. Concluding results proved seawater to be a promising environmental condition for the self-healing process in ECC specimens incorporating CA, in terms of recovery of mechanical and transport properties. Brucite was found to be formed as the additional healing agent that promoted self-healing in this condition. These results can be applied for coastal concrete structures.

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“…Durability refers to the ability of concrete to resist deterioration from the environment or service in which it is placed. Properly proportioned concrete that is properly placed, finished, and cured should endure without significant distress throughout its service life [8]. This is because the penetration of sulfates in solution causes change in the composition and microstructure of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Sulphuric Acid Resistant of Self Compacted Geopolymer Concrete Containing Slag and Ceramic Waste

2017

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Abstract. Malaysia is a one of the developing countries where the constructions of infrastructure is still ongoing, resulting in a high demand for concrete. In order to gain sustainability factors in the innovations for producing concrete, geopolymer concrete containing granulated blastfurnace slag and ceramics was selected as a cement replacement in concrete for this study. Since Malaysia had many ceramic productions and uses, the increment of the ceramic waste will also be high. Thus, a new idea to reuse this waste in construction materials have been tested by doing research on this waste. Furthermore, a previous research stated that Ordinary Portland Cement concrete has a lower durability compared to the geopolymer concrete. Geopolymer binders have been reported as being acid resistant and thus are a promising and alternative binder for sewer pipe manufacture. Lack of study regarding the durability of the geopolymer self-compacting concrete was also one of the problems. The waste will be undergoing a few processes in the laboratory in order to get it in the best form before undergoing the next process as a binder in geopolymer concrete. This research is very significant in order to apply the concept of sustainability in the construction field. In addition, the impact of this geopolymer binder is that it emits up to nine times less CO 2 than Portland Cement.

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Durability of Concrete: Second Edition

Cited by 3 publications

References 0 publications

Experimental Study on the Influence of Mogadishu Manufactured Sand on the Engineering Properties of Concrete

Experimental Study on the Influence of Mogadishu Manufactured Sand on the Engineering Properties of Concrete

Effect of different exposure conditions on the self‐healing capacity of engineered cementitious composites with crystalline admixture

Sulphuric Acid Resistant of Self Compacted Geopolymer Concrete Containing Slag and Ceramic Waste

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