The effect of uncoated polyvinyl alcohol (PVA) fibre addition on dynamic properties reinforced concrete (FRC) has been investigated in the current study. PVA fibres two geometric lengths (6 and 12 mm) with aspect ratio 428 857, respectively, were utilised. Fly ash was also used as partial replacement Portland cement all mixes. Based total volume, fractions 0.25% 0.5% evaluated for their fundamental frequency, modulus elasticity damping FRC. 28-Day static mechanical are measured. From...

In this paper, an experimental study on the effect of fly ash fineness heat hydration, microstructure, flow and compressive strength blended cement pastes was carried out evaluated against control paste. Fly ashes with different fineness: classified ash, run-of-station grounded ash; a median particle size 17.4, 11.3 5.7 μm, respectively, from same power station source in Australia were used to partially replace Portland at 20% 40% by weight using fixed water-to-binder ratio 0.40. Results...

The fractional changes of resistivity (FCR) cement-based sensors with various carbon black (CB) contents were firstly investigated under uniaxial compression in this study. Then the piezoresistive behaviours embedded unreinforced small-scale concrete beams flexural bending load. As for zones beam, stress magnitude and crack failure initiation can be detected monitored by a gradual decrease then sharp increase FRC. On other hand, as counterpart tension recognized rapid jump During monitoring...

A novel cement-based sensors was developed with integrated self-sensing superhydrophobicity, and self-cleaning functions in this paper. The synthesis carried out by penetrating precast graphene nanoplate/cement-based silane/isopropanol solutions. silane-treated showed satisfactory stress/strain sensing performance an average gauge factor of 141.8, exhibited excellent hydrophobic behaviour the highest water contact angle 163° on intact surface. decreased to 148° 142°, for surface scratches...

This investigation assessed the performance of polyvinyl alcohol (PVA) fibres 6 mm and 12 length in concrete. Based on total concrete volume, four fibre fractions (0·125, 0·25, 0·375 0·5%) were evaluated for their effect fresh hardened properties PVA reinforced concretes (PVA-FRCs). Fly ash was also used as partial replacement Portland cement all mixes. By carrying out a comprehensive set experiments (compressive strength, splitting tensile modulus elasticity, rupture residual flexural...

The current study assesses the drying shrinkage behaviour of polyvinyl alcohol fibre reinforced concrete (PVA-FRC) containing short-length (6 mm) and long-length (12 uncoated monofilament PVA fibres at 0.125%, 0.25%, 0.375%, 0.5% volumetric fractions. Fly ash is also used as a partial replacement Portland cement in all mixes. PVA-FRC mixes have been compared to length change control (devoid fibres) 3 storage intervals: early-age (0–7 days), short-term (0–28 long-term (28–112 days) intervals....

The effects of conductive rubber crumbs on the mechanical properties and self-sensing capacities cementitious composites are investigated in this study. rubberized with five different contents incorporated, ranging from 0%, 10%, 20%, 30% 40% by mass fine aggregate. Under uniaxial cyclic compression, all crumbs–filled cement exhibit excellent repeatability piezoresistivity. mortar 20% at a water-to-binder ratio 0.42 displayed best piezoresistive sensitivity. Based relative positions mortar,...

Massive waste rubber products become very challenging because the disposal generates negative impacts on ecological environments.The effect of conductive crumbs replacing fine aggregate physical, mechanical properties and electrical characteristics cement composites were investigated in this study.The results show that flowability mortar increased when replacement rate lower than 10%, but decreased substitution higher 10%.The compressive strengths rubberized with increase amount...

First Name is required invalid characters Last Email Address Invalid

This paper presents a comprehensive evaluation on self-compacting (SC) mortars incorporating 0, 1, 3, and 5% alumina nanoparticles (NA) as well 0% 30% rice husk ash (RHA) used Portland cement replacement. To evaluate the workability, mechanical, durability performance of SC NA RHA, fresh properties (slump flow diameter V-funnel time), hardened (compressive strength, flexural ultrasonic pulse velocity), (water absorption, rapid chloride permeability, electrical resistivity) were determined....

A Closed-Loop System of Construction and Demolition Waste Recycling J. Brennan, G. Ding, C.-R. Wonschik, K. Vessalas Pages 499-505 (2014 Proceedings the 31st ISARC, Sydney, Australia, ISBN 978-0-646-59711-9, ISSN 2413-5844) Abstract: This study discusses construction demolition waste recycling stream both in Australia Germany. Differences commonalities commercial practices between two countries are outlined, open research questions introduced. Following McDonough Braungart's cradle-to-cradle...

The structural behaviour of reinforced concrete beams incorporating polyvinyl alcohol (PVA) fibres is investigated in this study. A total 10 have been tested order to investigate how the characteristics (i.e. ductility, energy dissipation capacity and damping ratio) beam elements are affected by addition a certain amount PVA into concrete. properties PVA-FRC were assessed under action both monotonic cyclic loads. Four-point static flexural, three-point impact resonant frequency tests...

This study investigates the mechanisms of alkali-silica reaction (ASR) mitigation by supplementary cementitious materials (SCMs) under accelerated mortar bar test (AMBT) conditions. The compares effect traditional SCMs (fly ash, slag, metakaolin, and silica fume) on ASR expansion, calcium silicate hydrate (C-S-H) composition, portlandite consumption as well availability silicon aluminum in solution. Results show that at typical SCM replacement levels for effective (15% 25% fly 65% slag),...