Showing papers by "B. V. Venkatarama Reddy published in 2009"
TL;DR: In this article, a study on the durability of different types of stabilised and unstabilised rammed earth walls is presented, which shows that the mean erosion depth of the studied walls is about 2 mm (0.5% wall thickness).
229 citations
TL;DR: In this article, an artificial neural network (ANN) was used to predict the 28-day compressive strength of self compacting concrete (SCC) and high performance concrete (HPC) with high volume fly ash.
223 citations
TL;DR: In this article, the authors focus on certain issues pertaining to energy, carbon emissions and sustainability of building construction with particular reference to the Indian construction industry and present examples of low embodied energy materials.
Abstract: This paper focuses on certain issues pertaining to energy, carbon emissions and sustainability of building construction with particular reference to the Indian construction industry. Use of sustainable natural materials in the past, related durability issues, and the implications of currently used energy-intensive materials on carbon emissions and sustainability are discussed. Some statistics on the Indian construction sector regarding materials produced in bulk quantities and the energy implications are discussed. Examples of low embodied energy materials are provided. An analysis of total embodied energy in conventional and alternative building systems shows nearly 50% reduction in embodied energy of buildings. Potential uses for solid wastes for building materials are presented. Copyright The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org, Oxford University Press.
115 citations
TL;DR: In this paper, the influence of joint thickness on compressive strength has been examined through an experimental program and the nature of stresses developed and their distribution, in the block and the mortar of the soil-cement block masonry prism under compression, has been analyzed by an elastic analysis using FEM.
Abstract: Soil-cement blocks are employed for load bearing masonry buildings. This paper deals with the study on the influence of bed joint thickness and elastic properties of the soil-cement blocks, and the mortar on the strength and behavior of soil-cement block masonry prisms. Influence of joint thickness on compressive strength has been examined through an experimental program. The nature of stresses developed and their distribution, in the block and the mortar of the soil-cement block masonry prism under compression, has been analyzed by an elastic analysis using FEM. Influence of various parameters like joint thickness, ratio of block to mortar modulus, and Poisson’s ratio of the block and the mortar are considered in FEM analysis. Some of the major conclusions of the study are: (1) masonry compressive strength is sensitive to the ratio of modulus of block to that of the mortar ( Eb / Em ) and masonry compressive strength decreases as the mortar joint thickness is increased for the case where the ratio of blo...
37 citations
TL;DR: This paper examines the re-use of fluoride contaminated bone char sludge, as partial replacement for fine aggregate (river-sand) in the manufacture of dense concrete specimens, and examines the compression strength and fluoride leaching potential of the sludge admixed concrete specimens.
21 citations
TL;DR: In this article, the feasibility of improving moisture resistance, increasing the compressive strength and lowering the rate of contaminant release through chemical stabilization of the gypsum sludge with Portland cement was examined.
Abstract: Lime neutralization of acidic wastewater from a lead-acid battery industry produces lead contaminated gypsum sludge. An earlier study of the authors had focused on re-using this gypsum sludge without chemical stabilization to manufacture non-load bearing gypsum blocks. Un-stabilized gypsum blocks however have poor resistance to moisture. This study examines the feasibility of improving moisture resistance, increasing the compressive strength and lowering the rate of contaminant release through chemical stabilization of the gypsum sludge with Portland cement. Experimental results demonstrate that partial replacement of river sand by gypsum sludge in cement stabilized pressed blocks (CSPB) is a feasible route to achieve these objectives.
5 citations
01 May 2009
TL;DR: In this article, the influence of fly ash on the workability of two lean concrete mixes was examined and the compressive strength and fly-ash content relationships for the two leancrete mixes were obtained.
Abstract: Fly ash is used to improve the properties of concrete in both fresh and hardened states. This study was focused on the characteristics of fly-ash-blended lean concrete mixes suitable for production of solid concrete blocks used for masonry walls and for non-structural applications. The influence of superplasticiser and low calcium fly ash on the workability of two lean concrete mixes was examined. Replacement of both cement and sand by up to 50% fly ash was attempted. The compressive strength and fly-ash content relationships for the two lean concrete mixes were obtained. Maximum compressive strength was obtained for 10% cement replacement and 40% sand replacement by fly ash. The strength increased by two to three times when compared with concrete without fly ash. Similar enhanced strength for masonry was also observed for blocks with fly ash. The maximum flexural bond strength of masonry was for masonry couplets using blocks having 10% cement replaced by fly ash. The study showed that addition of fly ash...
1 citations