Based upon the statistical distribution of flexural fatigue life data and flexural fatigue strength of the steel fibre reinforced concrete (SFRC) containing blends of limestone powder (LP) and silica fume (SF), the influence of these inserts on the flexural fatigue performance of concretes is probed. Concrete mixes were proportioned to replace 30% cement with these mineral inserts in different ...

This paper was conducted to study the behavior of lightweight concrete, incorporating local lightweight aggregate (LWA), in terms of chloride ion permeability at different ages. The effect of lightweight fine aggregate replacement by normal weight sand (0, 25, 50 and 75% by volume) was investigated. Constant level of silica fume content (10% by weight of cement) as an addition was also consider...

It is well known that supplementary cementitious materials (SCMs) have obvious effects on the properties of concrete. In order to understand relationship between and ultrahigh strength concrete (UHSC), compositions UHSC were designed by simple-centroid design method. The investigated. was found incorporation silica fume (SF) improved flowability UHSC, but it decreased time acceleration period, ...

Concrete is in great demand due to global infrastructure expansion. Cement a critical component the production of concrete because it binds ingredients together. But primary issue arises environment release toxic gases such as CO3 and sulphur into atmosphere. To overcome this, some other cementitious materials, namely admixtures, were utilized partial replacements for cement. In this study, was...

In this study, first by surveythe parameters affecting the compressive strength, such as water to cement ratio, cementgrade, silica fume to cement percentage, and the various ratios oflight weight aggregate LECA, to total aggregate, Taguchi method is used, to test 9 mix designsobtained the mix design optimization. Since lightweight concrete is brittle like normal concrete, to resolve this probl...

Abstract Cement replacement materials are commonly used in concrete technology. Several researchers have examined high-performance after adding mineral admixtures to it, but further studies still needed provide the optimum dosage of these for instance fly ash and silica fume. This study compares three types mechanical properties (compressive strength, flexural splitting tensile) at age 28 90 da...

Concrete durability as an important engineering property of concrete, determining the service life of concrete structures very significantly, can be threatened and even lost due to the interactions of concrete with external environment. Bio-corrosion process caused by presence and activities of microorganisms producing sulphuric acid is a special type of sulphate deterioration of concrete mater...

An investigation on the flexural behaviour of reinforced high performance concrete (HPC) has been conducted. Crushed sandstone known as reactive aggregate was used for both fine and coarse aggregates. In addition, mineral admixtures such as silica fume and fly ash combined with superplasticiser was used. The beams were made with concrete having compressive strength in the range of 74 88 N/mm 2 ...

Neural networks have recently been widely used to model some of the human activities in many areas of civil engineering applications. In the present paper, artificial neural networks (ANN) for predicting compressive strength of cubes and durability of concrete containing metakaolin with fly ash and silica fume with fly ash are developed at the age of 3, 7, 28, 56 and 90 days. For building these...