...% and 15% by weight) of fine aggregates in mortar mixtures. The mortars incorporating the treated sludge exhibited superior mechanical strength and water resistance compared with those containing UTSS, with WTSS and RTSS showing the most notable improvements. This approach not only offers a cost...

...G. V. P. Bhagath Singh; K. Chiranjeevi Reddy; Kolluru V. L. Subramaniam A critical evaluation of the effects of mixture proportioning (binder paste content and coarse aggregate:fine aggregate ratio) on the workability, compressive strength and tensile strength of concrete made with alkali-activated...

...Kazuo Yamada; Yuichiro Kawabata; Kannosuke Shiraishi Various unresolved issues surrounding alkali–aggregate reaction (AAR) expansion are revisited in this article, employing the Ichikawa theory as a framework. According to the Ichikawa theory, alkali–silica gel (ASG) generated by the alkali–silica...

...Zhen Liu; Tyson Rupnow; Jose Milla; Samuel B. Cooper III Existing test methods for the evaluation of alkali–silica reaction (ASR) in aggregates such as the concrete prism test (CPT) and the accelerated mortar bar test (AMBT) have shown to be either time consuming or unreliable owing to false...

.... The physical properties of an ecologically friendly concrete – using fly ash (FA) as a fine aggregate substitute for sand – were examined in this study. Both destructive and non-destructive testing techniques were used to evaluate the concrete properties. After creating concrete mixtures with 10–50...

...Jae-In Lee; Chae-Young Kim; Joo-Ho Yoon; Ho-Jun Lee; Se-Jin Choi The use of alkali-activated composites and alternative aggregates reduces the carbon dioxide emissions of the construction industry and mitigates the problem of aggregate depletion. However, published investigations into non-cement...

.... In the first stage of work, crimped steel fibres (CSF) were used at volume fractions (V_f) of 0, 0.5, 1.0 and 1.5%, the concrete compressive strength was 35 MPa and the maximum coarse aggregate size (D_max) was 9.5 mm. With these specifications, eight block specimens were...

...Ayse Bicer; Atilla Gencer Devecioglu The aim of this study was to develop a simple algebraic equation to calculate the effective thermal conductivities of porous solid materials, particularly concrete with porous aggregates. The components of the equation consisted of material porosity and density...

...Minyao Xu; Yao Wang The establishment of an aggregate model that better matches real situations is one of the prerequisites to studying the mechanical properties of concrete. Previous models have focused on aggregates with regular shapes; however, this differs from the morphology of real aggregates...

...Colin Giebson; Katrin Seyfarth; Horst Michael Ludwig The alkali–silica reaction (ASR) starts with the dissolution of silica in alkali-reactive aggregates. Besides the thermodynamic basics of silica dissolution, kinetic data are needed to model ASR in order to describe the temporal course...

...Saumyaranjan Sahoo; Bhupinder Singh For this paper, the punching shear behaviour of 18 steel-fibre recycled aggregate concrete (SFRAC) balanced slab–column connections was experimentally investigated and analytically modelled for the following variables: the recycled concrete aggregate replacement...

...Jianzhuang Xiao; Chi Sun Poon; Yuyin Wang; Yuxi Zhao; Tao Ding; Yue Geng; Taohua Ye; Long Li Recycled aggregate concrete (RAC) has received huge amounts of attention in the past two decades. However, there are still many critical problems about fundamental behaviours of RAC, which need...

...M. H. N. Yio; Y. W. Ho; F. Abdul Wahid; H. S. Wong; N. R. Buenfeld A new method for determining the cement paste, fine aggregate and coarse aggregate content of hardened concrete using micro X-ray fluorescence (μXRF) is presented. The method involves mathematical and morphological operations...

... as researchers in general, have omitted to consider the influence of aggregate, in particular its stiffness, in the models developed for estimating creep and shrinkage of concrete. This paper shows that the American ACI, Australian AS 3600, European Eurocode 2, Japanese JSCE and B4 models are mostly found...

...Changhong Chen; Songlin Bai; Ying Huang; Lik Lam; Yao Yao; Leon M. Keer The random packing of aggregate particles is an important factor affecting the mechanical properties of concrete at the mesoscopic scale. In the current study, a meso-mechanical pretreatment algorithm is developed to construct...

... and blended aggregates (BA). The effects of using different types of cement and paste volumes were compared. It was found that concrete made using type IL cement (containing 14% limestone powder) showed comparable performance to concrete made with type I/II cement. Based on the results of laboratory testing...

...Jinzhen Li; Lei Huang; Shaowen Huang The compressible packing model (CPM), which is a method for designing aggregate gradation, was used to calculate the packing density of quartz aggregate. The aggregate gradation of ultra-high-performance concrete (UHPC) was optimised using the CPM. The number...

...Sofia Real; Cinthia Maia; José Alexandre Bogas; Maria da Glória Gomes Various thermal conductivity models for multi-phase materials have been suggested in the literature. However, none have been specifically developed or adapted for structural lightweight aggregate concrete (SLWAC). In this context...

...G. Santha Kumar, MTech The inferiority of recycled fine aggregate mortar (RFAM) is a major obstacle to its utilisation and a method to enhance RFAM is thus necessary to scale up applications. The concept behind the method proposed in this paper involves using a calcium hydroxide solution to pre...

... strength for 2 cm of straw length are obtained. Table 1. Chemical composition of aggregates Composition: % Silicon dioxide (SiO_{2) Calcium oxide (CaO) Aluminium oxide (Al2O3) Potassium oxide (K2O) Sodium oxide (Na2O}...