a Faculty of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, PR 5 China 6 b Concrete Durability Group, Department of Civil and Environmental Engineering, Imperial College London, 7 SW7 2AZ, UK 8 9 ABSTRACT 10 11 In this study, the influence of the aggregate-cement paste interfacial transition zone (ITZ) on the steady-state 12 chloride diffusivity of morta...

A study of the bond characteristics of carbonate aggregates was made by applyirig shear stresses to 1/8-inch thick slices of highway concrete. It was found that aggregates can be classified as strong, indeterminate, and weak relative to the matrix of the concrete, when accurate lithological cataloging of the aggregates from the source quarry section is made prior to the shear study. Definite cl...

The aim of the study was to generate rules for the prediction of the chloride resistance of concrete modified with high calcium fly ash using machine learning methods. The rapid chloride permeability test, according to the Nordtest Method Build 492, was used for determining the chloride ions' penetration in concrete containing high calcium fly ash (HCFA) for partial replacement of Portland ceme...

Sulfate uptake in haploid carrot cultures can be experimentally controlled by the sulfur source provided for growth. The rate of sulfate uptake is low in cells grown on cystine or sulfate and high in sulfur-starved cells. A selenate-resistant variant cell line has been isolated from a haploid carrot line. The variant shows hypersuppression of sulfate uptake by cystine and essentially normal con...

Polymer concrete, a composite material in which the binding material is some type of polymer, is being used more widely in the construction industry. Polymer concretes can also contain steel reinforcing rebars; therefore, the rate of adhesion between polymer concrete and reinforcing steel must be determined. Our study investigated the extent and behaviour of adhesion in the case of reinforcing ...

Introduction . The development of the Arctic Region and oil gas fields in North Atlantic Ocean leads to an increase production high-strength concrete structures. Thus, it is becoming increasingly vital make such low-permeability concretes more freeze-thaw resistant. Aim To conduct experimental studies for obtaining reliable data required develop a standardized approach normalization / frost-sal...

Concrete structures without sufficient durability can be damaged by sulfates in groundwater and from surrounding rock layers. To evaluate the performance of a concrete mixture, precise performance-oriented test methods are must. Therefore, new oriented procedure based on tensile strength measurements was developed considering experiences reported international literature recommendations state-o...

Fiber reinforced concrete (FRC) has been widely used due to its advantages over plain concrete such as high energy absorption, post cracking behaviour, flexural and impact strength and arresting shrinkage cracks. But there is a weak zone between fibers and paste in fiber reinforced concretes and this weak zone is full of porosity, especially in hybrid fiber reinforced concretes. So it is necess...

High volume fly ash (HVFA) concretes are one component of creating a more sustainable infrastructure. By replacing 50 % or more of the Portland cement with fly ash, a significant reduction is achieved in the carbon footprint of the in place concrete. While HVFA mixtures can be proportioned to produce equivalent long term performance as conventional (cement-only) mixtures, performance problems a...