Durability of concrete Korea Times

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Durability of concrete - koreatimes

Sep 22, 2020  A local newspaper recently reported a comparison chart showing the durability of concrete in advanced nations. Some 15-year-old tabulation (rounded

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Durability of concrete - KoreaTimes

Sep 22, 2020  A local newspaper recently reported a comparison chart showing the durability of concrete in advanced nations. Some 15-year-old tabulation (rounded number

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Durability of concrete - koreatimes

Sep 22, 2020  Durability of concrete

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Assessment of Durability of Concrete Structure Subject to ...

May 27, 2018  MOCT, Standard Specification for Concrete Structures on Durability, Ministry of Construction and Transportation, Sejong City, Republic of Korea, 2004, in Korean. JSCE, Standard Specification for Durability of Concrete, vol. 108, Concrete Library, Japan Society of Civil Engineers, Tokyo, Japan, 2002, in Japanese.

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Durability of Concrete: Definition and Significance ...

2. Grade of concrete is the characteristic cube strength. 3. For very sever conditions only air entrained concrete should be used. Effect of W/C Ratio on Durability: W/c ratio has a great impact on the durability of the concrete. Higher w/c ratio is the main cause of volume change and higher permeability of concrete.

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Concrete Strength and Concrete Durability, Are they ...

Sep 22, 2017  A concrete of 35MPa or 40 MPa can be a more durable concrete than a concrete of 60 MPa or 70MPa from the point of the view of durability performance indicators such as

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Lotte EC applies eco-friendly concrete ... - Korea IT Times

Mar 18, 2021  Eco-friendly concrete is a technology that reduces the use of cement, which is a common concrete binding material, to 50%, increases fly ash and furnace slag powder by 20 and 30%, respectively, reducing carbon dioxide generation and improving durability of buildings.

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Mechanical and Durability Properties of Concrete Made with ...

Mechanical and Durability Properties of Concrete Made with Used Foundry Sand as Fine Aggregate. G. Ganesh Prabhu,1 Jin Wook Bang,1 Byung Jae Lee,2 Jung Hwan Hyun,1 and Yun Yong Kim1. 1Department of Civil Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea.

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Assessment of Durability of Concrete Structure Subject to ...

May 27, 2018  MOCT, Standard Specification for Concrete Structures on Durability, Ministry of Construction and Transportation, Sejong City, Republic of Korea, 2004, in Korean. JSCE, Standard Specification for Durability of Concrete, vol. 108, Concrete Library, Japan Society of Civil Engineers, Tokyo, Japan, 2002, in Japanese.

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Durability of recycled aggregate concrete using pozzolanic ...

Jan 01, 2008  2.1. Testing for strength. The compressive strength of concretes was tested on cylindrical concrete specimens (200 mm in length and 100 mm in diameter).The mix proportion for manufacturing concrete specimens was 350 kg/m 3 binder, 787 kg/m 3 fine aggregate (density: 2.61), and 1055 kg/m 3 25 mm coarse aggregate. The free water/binder ratio was 0.45, and PFA and GGBS were admixed in concrete

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15 Factors Affecting Durability of Concrete - The Constructor

🕑 Reading time: 1 minute A durable concrete is one that performs satisfactorily under expected exposure conditions for specified life of the structure. Various factors affecting the concrete durability are discussed below. Contents:Factors Affecting Durability of Concrete1. Cement Content2. Aggregate Quality3. Water Quality4. Concrete Compaction5. Curing Period6. Permeability7. Moisture8 ...

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International Journal of Concrete Structures and Materials ...

The International Journal of Concrete Structures and Materials (IJCSM) provides an international forum for international civil engineers and material scientists to present and discuss various topics related to concrete, cement-based composites, polymer concrete, fiber-reinforced concrete, and concrete structures.Topics include, but are not limited to, research results on

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Evaluation of Concrete Durability Performance with Sodium ...

This paper presents an enhanced performance in concrete impregnated with silicate compound. Two different types of impregnant materials (inorganic and combined type) are applied to concrete samples with different strength grade (21 MPa and 34 MPa). Through lab-scale test, improved performances in impregnated concrete are evaluated regarding porosity, strength, chloride diffusion coefficient ...

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Effect of Curing Temperature Histories on the Compressive ...

This study examined the relative strength-maturity relationship of high-strength concrete (HSC) specifically developed for nuclear facility structures while considering the economic efficiency and durability of the concrete. Two types of mixture proportions with water-to-binder ratios of 0.4 and 0.28 were tested under different temperature histories including (1) isothermal curing conditions ...

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10 Properties of Concrete and their Uses - The Constructor

Concrete is known by its grade which is designated as M15, M20 etc. in which letter M refers to concrete mix and number 15, 20 denotes the specified compressive strength (f ck) of 150mm cube at 28 days, expressed in N/mm 2. Thus, concrete is known by its compressive strength.

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Effect of different expanded aggregates on durability ...

Mar 01, 2021  Since concrete is potentially vulnerable to certain circumstances, its durability-related properties, such as water absorption or permeability, need to be taken into consideration as important variables [39,40]. The durability of lightweight concrete depends mainly on its major components: i.e. binder and lightweight aggregates.

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Compressive Strength, Chloride Permeability, and Freeze ...

Jul 21, 2014  This study investigated compressive strength, chloride penetration, and freeze-thaw resistance of multiwalled carbon nanotube (MWNT) concrete. More than 100 cylindrical specimens were used to assess test variables during sensitivity observations, including water-cement ratios (0.75, 0.5, and 0.4) and exposure to chemical agents (including gum arabic, propanol, ethanol, sodium polyacrylate ...

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Effects of Particle Size and Cement Replacement of LCD ...

Jan 30, 2017  For a concrete mix having a W/B ratio of 0.44, cement was replaced with LPWG glass powder (LGP) at ratios of 5, 10, 15, and 20% (LGP12) and 5 and 10% (LGP5) according to the particle size to prepare test cylinder specimens, which were tested with respect to air contents, slump in fresh concrete, and compressive strength and splitting tensile ...

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Biden, South Korea’s Moon express ... - The Straits Times

May 22, 2021  The two leaders also reaffirmed the strength of the US-South Korea alliance, with Mr Biden calling it a linchpin of peace, security and prosperity in the region. ... told The Straits Times that ...

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Electrical Resistivity Test of Reinforced Concrete Slabs

Sensors 2021, 21, 4622 4 of 16 Figure 2. 2D cross-section of finite element models for simulation of electrical field in concrete: (a,c) represents a finite element model for a plain and a reinforced concrete slab, respectively;(b,d) for the electric potential field in a plain and a reinforced concrete slab, respectively.Using an input true resistivity of 100 kW-cm and an external current ...

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Produce High Strength Concrete GCP Applied Technologies

Workability, durability, high strength result in superior concrete. ADVA® products are high efficiency polycarboxylate-based superplasticizers especially formulated to extend slump-flow life while imparting extreme workability without segregation to concrete, to achieve high early compressive strength.

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Durability of Concrete Structures SpringerLink

Jan 15, 2011  Seoul National University and Korea Concrete Institute, Seoul, pp 44–55 ISBN:89-89499-02-X93530. Google Scholar 31. NAHE (2004) Durable concrete structures—recommended specifications for new concrete harbor structures. Norwegian Association for Harbor Engineers, TEKNA, Oslo (in Norwegian) 32

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Lotte EC applies eco-friendly concrete ... - Korea IT Times

Mar 18, 2021  Eco-friendly concrete is a technology that reduces the use of cement, which is a common concrete binding material, to 50%, increases fly ash and furnace slag powder by 20 and 30%, respectively, reducing carbon dioxide generation and improving durability of buildings.

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Enhancing the durability properties of concrete containing ...

Jan 04, 2013  This study concerns properties of concrete containing Recycled Aggregate (RCA). To compensate for a reduction of properties for the RCA concrete, 30% Pulverised Fuel Ash (PFA) and 60% Ground Granulated Blast furnace Slag (GGBS) were used for replacement for Ordinary Portland Cement (OPC). The compressive strength for RCA concretes was measured for 180 days, and simultaneously the durability ...

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Concrete Formwork Removal Time, Specifications and ...

Factors Affecting Concrete Formwork Striking Times. The striking time of concrete formwork depends on the strength of structural member. The strength development of concrete member depends on: Grade of concrete – higher the grade of concrete, the rate of development of strength is higher and thus concrete achieves the strength in shorter time.

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Effect of different expanded aggregates on durability ...

Mar 01, 2021  Since concrete is potentially vulnerable to certain circumstances, its durability-related properties, such as water absorption or permeability, need to be taken into consideration as important variables [39,40]. The durability of lightweight concrete depends mainly on its major components: i.e. binder and lightweight aggregates.

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Estimation of the Compressive Strength of Concrete Using ...

Apr 26, 2012  Compressive strength of concrete is a very important parameter in the quality control of both new and existing concrete pavement. It has been widely used to evaluate the concrete strength both in the laboratory and in the construction field regardless of whether numerous mix designs or identical mixtures are used.

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Shrinkage and durability characteristics of eco-friendly ...

Mar 01, 2013  The shrinkage and durability of eco-friendly fireproof high-strength concrete was evaluated. EFFHSC was reduced CO 2 emissions by 34.6% compared to ordinary Portland cement concrete. EFFHSC can be used as a substitute for the high-strength concrete that uses ordinary Portland cement.

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Application of Neural Networks for Estimation of Concrete ...

Jun 03, 2004  The uniaxial compressive strength of concrete is the most widely used criterion in producing concrete. Although testing of the uniaxial compressive strength of concrete specimens is done routinely, it is performed on the 28th day after concrete placement.

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Why We Test Concrete Compressive Strength after 28 Days?

After 14 days of casting concrete, concrete gains only 9% in next 14 days. So, rate of gain of strength decreases. We have no clear idea upto when the concrete gains the strength, 1 year or 2 year, but it is assumed that concrete may gain its final strength after 1 year.So, since the concrete strength is 99% at 28 days, it's almost close to its final strength, thus we rely upon the results of ...

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Workability of Concrete - Types and Effects on Concrete ...

Thus, the strength of concrete inversely proportional to the workability of concrete. The reason for this relation is that water from the concrete dries up and leaves voids when setting of concrete occurs. The more the water is, the more will be the number of voids. Thus, increase in number of voids decreases the compressive strength of concrete.

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[INTERVIEW] The case for building cities out of wood ...

Aug 25, 2020  YEONGJU/DAEJEON - For more than a century, concrete and steel have replaced wood as primary building materials, especially for tall structures. But thanks to increasing demand for "greener construction" and technological advances, timber is back in style. The Hangreen, a 19.1-meter wooden building in Yeongju, symbolizes the new trend in Korea. The five-story structure, mainly made of

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Cold War hangover: How safe are Korea's anti-tank ...

Dec 15, 2017  "Accidents can be prevented by examining the strength and corrosion with a non-destructive inspection of barricades over 30 years old." However, the rock drops have been maintained for security reasons. The Hankook Ilbo, the sister paper of The Korea Times, went to Paju City and checked 20 barricades.

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Reinforced concrete - Wikipedia

Reinforced concrete (RC), also called reinforced cement concrete (RCC), is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars and is usually embedded passively in the concrete before the concrete ...

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The New York Times - Breaking News, US News, World News ...

Live news, investigations, opinion, photos and video by the journalists of The New York Times from more than 150 countries around the world. Subscribe for coverage of U.S. and international news ...

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