Journal ArticleDOI
Non-steady-state accelerated chloride penetration resistance of structural lightweight aggregate concrete
J. Alexandre Bogas,Augusto Gomes +1 more
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TLDR
In this paper, a comprehensive experimental study was carried out involving three types of non-steady-state tests, which simulate different exposure conditions and penetration mechanisms, and it was shown that the chloride penetration resistance is mainly affected by the cementitious paste and that high performance LWAC can be produced.Abstract:
This study aims to characterise the chloride penetration resistance of structural lightweight aggregate concrete (LWAC) produced with different types, volumes and initial wetting conditions of lightweight aggregates (LWA), types of cement and contents of fly ash and silica fume, w/c ratios and curing conditions. A comprehensive experimental study was carried out involving three types of non-steady-state tests, which simulate different exposure conditions and penetration mechanisms. It is shown that the chloride penetration resistance is mainly affected by the cementitious paste and that high performance LWAC of 30–70 MPa can be produced. Regardless of the type of aggregate, we propose exponential relations to estimate the diffusion coefficient of chlorides. The volume and initial wetting condition of LWA had little influence on the chloride resistance. A long-term higher reduction of the diffusion coefficient was found in less dense LWAC. Reasonable correlations between the non-steady-state tests were obtained. Contrary to what is suggested in some European standards, the concrete strength cannot properly predict the durability behaviour of LWAC.read more
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Freeze–thaw resistance of concrete produced with fine recycled concrete aggregates
TL;DR: In this article, the authors characterize the freeze-thaw resistance of normal strength and high-strength concrete with partial or total replacement of fine natural aggregate (FNA) by fine recycled concrete aggregate(FRCA), and the surface scaling, mass loss, length change, residual ultrasound pulse velocity and residual compressive strength were monitored for different FRCA replacement ratios.
Journal ArticleDOI
Investigation on mechanical properties and microstructure of high performance polypropylene fiber reinforced lightweight aggregate concrete
TL;DR: In this article, the effect of high performance polypropylene (HPP) fiber on the mechanical properties of lightweight aggregate concrete (LWC) was investigated by using scanning electron microscope (SEM).
Journal ArticleDOI
Lightweight expanded clay aggregate as a building material – An overview
TL;DR: The incorporation of LECA in the matrix increased its workability, decreased density, decreased mechanical strength, decreased freeze/thaw resistance, increased water absorption, decreased chloride penetration resistance, but increased thermal insulation and fire resistance.
Journal ArticleDOI
Overview of supplementary cementitious materials usage in lightweight aggregate concrete
TL;DR: In this paper, a review summarizes previous findings on the utilization of different types of SCM (such as silica fume, fly ash, ground granulated blast furnace slag, metakaolin, etc.) in lightweight aggregate concrete as well as the effects on the resulting concrete performances, namely the fresh, mechanical and durability properties.
Journal ArticleDOI
Experimental research on the performance of lightweight concrete containing foam and expanded clay aggregate
TL;DR: In this paper, the preparation of self-flowing lightweight aggregate foamed concrete (LAFC) resulting from the mixing of stable foam, expanded clay aggregate (ECA) and silica fume (SF) as main raw materials was addressed.
References
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Concise eurocode for the design of concrete buildings. based on bsi publication dd env 1992-1-1: 1992. eurocode 2: design of concrete structures. part 1: general rules and rules for buildings
A W Beeby,R S Narayanan +1 more
TL;DR: In this article, the authors present guidance on prestressed concrete design in normal weight concrete where prestress is by fully bonded tendons, advice is given on the required numbers of tendons and the prestressing force and the limit states.
Journal ArticleDOI
Chloride attack of reinforced concrete: an overview
TL;DR: The mechanism of chloride-induced corrosion of steel embedded in concrete, the ingress of chlorides into the concrete, and the threshold chloride content for corrosion to occur are discussed in this paper.
Journal ArticleDOI
Durability properties of high volume fly ash self compacting concretes
TL;DR: In this article, the authors present an experimental study on the durability properties of self compacting concretes (SCCs) with high volume replacements of fly ash, and the results indicated that the SCCs showed higher permeable voids and water absorption than the vibrated normal concrete of the same strength grades.
Book
Lightweight aggregate concrete : science, technology, and applications
Satish Chandra,Leif Berntsson +1 more
TL;DR: In this article, the authors give an overall picture of lightweight aggregate concrete, from the historical background, aggregate production, proportioning and production of concrete, to applications in structures, including physical properties and chemical durability.
Patent
Lightweight aggregate concrete
TL;DR: In this paper, the authors proposed a lightweight aggregate concrete using lightweight aggregate, water and cement, which has 0.7-1.5 absolute dry specific gravity, 0-5 wt.% entrained air amount is preferable.