The Rapid Chloride Permeability Test and Its Correlation to the 90-Day Chloride Ponding Test

Pfeifer, Donald W.; McDonald, David B.; Krauss, Paul D.

doi:10.15554/pcij.01011994.38.47

Cited by 38 publications

(11 citation statements)

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“…For RCPT, 50 mm diameter cores were cut from top surfaces of 100 mm 9 200 mm cylinders after 28 days of curing. Epoxy coated and vacuum saturated core specimens Grace 2006;Ptefier et al 1994) were placed in the test device as per Code (2012) requirements. The vacuum process was carried out to remove the air voids and eventually, to fill those voids with water to make the concrete sample conductive to electrons.…”

Section: Methodsmentioning

confidence: 99%

Optimum Proportion of Masonry Chip Aggregate for Internally Cured Concrete

Iffat

Manzur

Rahman

et al. 2017

Int J Concr Struct Mater

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Proper curing of concrete is essential for achieving desirable mechanical properties. However, in a developing country like Bangladesh, curing is often neglected due to lack of proper knowledge and skill of local contractors. Consequently, general concreting work of the country has been found to have both strength and durability issues. Under such scenario, internal curing could be adopted using masonry chip aggregate (MCA) which is quite common in this region. It is observed that saturated MCA desorbs water under favorable relative humidity and temperature. This paper presents the effectiveness of MCA as internal curing medium and recommends a tentative optimum mix proportion to produce such concrete. The experimental study was conducted in two phases. It was found that 20% replacement of stone chips with MCA produced better performing internally cured concrete both in terms of strength and durability. Performance of internally cured concrete with recommended proportion of MCA is comparable to that of normally cured control concrete samples with conventional stone chips. In addition, internally cured concrete performed significantly better than control samples when kept under similar adverse curing conditions. In the absence of supply of external water for curing, compressive strength of internally cured concrete for 20% replacement can be as high as 1.5 times the strength of the control concrete samples. Significant better performance in permeability than that of control samples was also observed for this percent replacement under such adverse curing conditions. Keywords: internal curing, lightweight aggregate, temperature, humidity, desorption, strength, permeability. Abbreviations IC

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Section: Methodsmentioning

confidence: 99%

Optimum Proportion of Masonry Chip Aggregate for Internally Cured Concrete

Iffat

Manzur

Rahman

et al. 2017

Int J Concr Struct Mater

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“…The properties, such as compressive strength, split tensile strength and flexural strengths are responsible for the behavior of concrete under specific loading conditions. These properties are largely affected by the materials used, size of aggregates, their types and also the WC ratio for the mix [41]. Using SF, Slag and MP as a replacement of cement in the concrete mix render it to achieve an elevated level of durability and strength increment.…”

Section: Properties Of Hardened Concretementioning

confidence: 99%

Analysis of Mechanical Properties of Self Compacted Concrete by Partial Replacement of Cement with Industrial Wastes under Elevated Temperature

Mansoor¹,

Shah

Khan

et al. 2018

Applied Sciences

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Self-Compacting Concrete (SCC) differs from the normal concrete as it has the basic capacity to consolidate under its own weight. The increased awareness regarding environmental disturbances and its hazardous effects caused by blasting and crushing procedures of stone, it becomes a delicate and obvious issue for construction industry to develop an alternative remedy as material which can reduce the environmental hazards and enable high-performance strength to the concrete, which would make it durable and efficient for work. A growing trend is being established all over the world to use industrial byproducts and domestic wastes as a useful raw material in construction, as it provides an eco-friendly edge to the construction process and especially for concrete. This study aims to enlighten the use and comparative analysis for the performance of concrete with added industrial byproducts such as Ground Granulated Blast Furnace Slag (GGBFS), Silica fumes (SF) and Marble Powder (MP) in the preparation of SCC. This paper deals with the prediction of mechanical properties (i.e., compressive, tensile and flexural Strength) of self-compacting concrete by considering four major factors such as type of additive, percentage additive replaced, curing days and temperature using Artificial Neural Networks (ANNs). way to counter the hazardous effects of such materials. By using different percentages of materials as replacement for cement in concrete mix of grade M20 (Mix ratio 1:1.5:3) and a suitable water-cement (w/c) ratio 0.40, there is a broad analysis of performance of such high strength concrete with respect to the different adding ratios by testing the mechanical properties of concrete such as its compressive strength, split tensile strength and flexural strength [2]. Fresh properties for the SCC have also been monitored and examined, including the V-Funnel test, J-Ring test and Slump test. All these were carried out for the detail examination of fresh concrete behavior. Tests for hardened concrete were carried out using samples of different ratios of materials as a replacement in hardened cylinder and cube form. Many samples were casted for the comprehensive testing process. The samples with replacement ratios of 5%, 10%, 15%, 20% and 25% are tested thoroughly to analyze the hardened properties of mixes. By the utilization of these industrial byproducts and waste materials, an elevated level of pollution treatment can be achieved by the construction industry all over the world. This induction of materials in concrete tends to provide efficient and high strength ranging concrete mixes and is eco-friendly, too [3]. Previously much discussion was had on replacement of cement with Fly Ash and Marble Powder [4-9], but Ground Granulated Blast Furnace Slag (GGBFS) [4] was limited in use. Therefore, this research has contributed the comparison of Fly Ash and Marble powder with GGBFS not only at room temperature but also at elevated temperature. Furthermore, most previous studies only major focused on compressive strength [4][5][6...

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“…31 Improvement of concrete by using polymeric materials has been attempted before, Given the properties of concrete without such a reinforcement, the main objectives of adding them are high compressive and tensile strength, high impact and abrasive resistance, service in adverse environments (wind, moisture, etc. Thus, it is necessary to add various aggregates.…”

Section: Rebar Concrete Applicationmentioning

confidence: 99%