The paper presents a critical review of the relationship between ettringite formation and sulfate attack. Ettringite formation is associated with expansion. However, any ettringite-related expansion is not necessarily related to sulfate attack. Early ettringite formation (EEF) which occurs immediately (within hours) in a plastic fresh mixture does not produce any damaging expansion and is ...
Effect of External Sulfate Attack on Self Compacted Concrete Dr. Zena K. Abbas Al-Anbori Engineering College, University of Baghdad/Baghdad Email:[email protected] Received on: 1/4/2012 & Accepted on: 8/11/2012 ABSTRACT Self-compacting concrete (SCC) is an innovative concrete that does not require vibration for placing and compaction.
The concrete resistance to sulphate attack was enhanced greatly. Application of green concrete is an effective way to reduce ... A.S.S. Sekar.,2011)" [8], Self-compacting concrete (SCC) is one of the most significant advances in concrete technology in the last two decades. SCC was
significantly increased the resistance of SCC to the external sulfate attack due to lime consuming reaction. Keywords: Compressive strength, Fly ash, Self-compacting concrete, Sulfate attack, XRD. 1.0 INTRODUCTION Self-compacting concrete, SCC, is characterized by its high flowability, passing ability (flows through tight
In this paper, the assessment of magnesium sulphate (MS) attack on concrete containing various ratios of the supplementary cementitious materials (SCM) was investigated for concrete containing FA, RHA, and GGBS with cement replacement levels of 15%, 10%, and 5%, respectively, based on the selected samples from the concrete to the statement of ...
Jul 09, 2019· This paper aims to design a green and high-performance magnetic water concrete from normal materials used for manufacutring concrete. First, magnetic water was prepared by placing magnets into a beaker containing water of 985 Gauss magnetic field. Then, self-compacting concretes (SCCs) were produced with the optimal mix ratio of sulphate ...
Classical sulfate immersion tests for concrete have often given different behaviour from that observed in real field exposure. Such tests do not consider other parameters existing in service that can affect the mechanisms and kinetics of sulfate attack. On the other hand, the current shift towards performance-based standards and specifications for concrete requires the development of ...
The loss in mass, compressive strength and sorptivity of cubes were found to be negligible under Sulphate attack. It was observed that limestone and quarry dust powder resists Sulphate attack within tolerable limits. References. Shankar H.Sanni, 'Effect of Viscosity Modifying Admixtures On Self Compacting Concrete,' CE&CR JULY 2007, pp 66-71.
Self-Compacting Concrete (SCC) has a lower porosity due to its high flowability. In line with the above, the durability of an SCC design consisting of coarse RCA and 50% by volume of fine RCA is evaluated in this research. This concrete underwent three tests: behavior during freeze/thaw and moist/dry cycles, and resistance to sulphate attack.
concrete is the most innovative type concrete in the recent days. Self-compacting concrete (SCC) does not require any type of vibration during its placement and compaction. The concrete is able to keep moving under its own weight through any type of formwork without any external compaction and even the concrete can flow through congested ...
Self-compacting concrete (SCC) represents one of the most outstanding advancement in concrete technology during the ... alkaline attack, acid attack, sulphate attack and chloride attack than conventional concrete. Ramanathan et.al (2013) investigated the workability and
Ofuyatan et al.: Durability Properties of Palm Oil Fuel Ash Self Compacting Concrete of particular concrete mixes to sulphate attack on concrete. The degree of sulphate attack was evaluated by measuring the weight losses of the specimens at 14, 28, 56 and 90 days, respectively. C. Saturated Water Absorption
Self-compacting concrete (SCC) is a recently developed concept in which the ingredients of the concrete mix are proportioned in ... Acid attack and sulphate attack tests. In this study, substituting fly ash and steel fibers for improving the strength of SCC. Experimental Investigation on Strength Characteristics of Hybrid Fiber Reinforced Self ...
reinforced self compacting concrete, a comprehensive study which involves durability parameters loss of weight and loss in compressive strength of specimens due to acid attack, sulphate attack are not available for high strength self compacting concrete (HSSCC). Hence, considering the gap in
Self-compacting concrete (SCC) is an innovative concrete that does not require vibration for placing and compaction. It is able to flow under its own weight, completely filling formwork and achieving full compaction, even in the presence of congested reinforcement. The …
In self-compacting concrete (SCC), the amount of coarse aggregates, use of fillers, and type of additives play important roles in its self-compaction, including mechanical and durability properties.
percentage loss in weight (1.80%) when exposed to sulphate attack for 28 days . The fibre reinforced self compacting concrete with 30% Pond ash and 20% foundry sand used as replacement for river sand exhibited good durability performance in terms of …
the implications involved in design and construction of durable concrete structures. Keywords: self-compacting concrete, sulphuric acid attack, mass variation, microstructure, porosity 1 Corresponding author: Email- [email protected], Tel- +32 16 321416, Fax- +32 16 321976
resistant to freeze/thaw and moist/dry cycles, and sulphate attack, according to the results obtained in 4, 3 and 2 samples respectively, and of sufficient durability for use in structural concrete components. Keywords: Self-Compacting Concrete, Recycled Concrete Aggregate, Freeze/Thaw Test, Moist/Dry Test, Sulphate Attack Test. 1 Introduction
Keywords:- Fresh Properties, Durability Properties, Self-Compacting Concrete (SCC), Rice Husk Ash (RHA), Filtered Sand (FS), Sulphate Resistance, Sodium Sulphate (Na 2 So 4). INTRODUCTION Concrete is a widely used construction material for various types …
Final report of RILEM TC 188-CSC – Casting of Self Compacting Concrete VII PRO 34: International RILEM Conference on Microbial Impact on Building Materials (2003) (ISBN: 2-91); Edited by M. Ribas Silva PRO 35: International RILEM TC 186-ISA on Internal Sulfate Attack and Delayed Ettringite
Mar 21, 2020· the calcium sulfate formed will affect concrete by a sulfate attack mechanism [2,3], while, in addition, hydrogen ions exert a dissolution effect. The sulfuric acid reacts first with the calcium hydroxide (CH) to precipitate gypsum (CaSO 4 2H 2O) on …
Durability of Concrete and Concrete Structures Sulphate attack: Most soils contain some sulphate in the form of calcium, sodium, potassium, and magnesium. They occur in the soil and ground water. Solubility of calcium sulphate is low. Solid sulphates do not attack concrete severely but when the chemicals are in solution, they find entry into
self-compacting concrete at a rate of 2 to 2.5 m/h when it is already at a height of 2 m, the formwork pressure can even take values over 90 kN/m2 with braces at 180 kN [22]. In the literature, there is very little data on heavyweight self-compacting concrete. In [23], a self-compacting concrete mix with a density of 3300 kg/m3 was developed using
The resistance of concrete to alkali attack was found by the percentage loss of weight of specimen and the percentage loss of compressive strength on immersion of concrete cubes in alkali water. Table5:23 represents the Percentage loss in Weight of self compacting concrete due to Alkality respectively. Table 4 shown the Percentage )
The Behaviour of Self Compacting Concrete with Waste Plastic Fibers When Subjected To Acid Attack. Vijaya G. S #1, Dr. V aishali G. Ghorpade*2, Dr. H. Sudarsana Rao#3 #1Assistant Professor, Department of Civil Engineering, Govt. Sri Krishnarajendra Silver Jubilee Technological Institute, Bangalore-560 001.
e sulphate attack for the concrete specimens was assessed by the subsequent testing of the changes in the compressive strength, length, and mass. 2. Constituent Material ... Self compacting concrete Ordinary Portland cement (OPC) Fly ash (FA) Rice husk ash (RHA) Ground granulated blast furnace slag (GGBS) OPC 440 kg OPC 432 kg OPC 406 kg FA %5 ...
products (EFNARC).The utilisation of self-compacting concrete started growing rapidly. EFNARC, making use of broad practical experiences of all members of European federation with SCC, has drawn up specification and guidelines to provide a framework for design and use of high quality SCC, during 2001. Self-compacting concrete has been
SELF COMPACTING CONCRETE (HSSCC) N. Venkat Rao 1, M. Rajasekhar 2, ... INFLUENCE OF SULPHATE ATTACK ON CONCRETE Most of Soils contain sulphate residues in the form of Calcium, Sodium, Potassium and magnesium. Most of them are present either …
Self-compacting sand concrete (SCSC) is a special type of self-compacting concrete characterized by the use of aggregates with a maximum size less than 5 …
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