scholarly journals Using the Moisture Retention Property of Recycled Coarse Aggregates for Self-Curing of High Performance Concrete

2022 ◽  
pp. 1-5
Author(s):  
Z. Awadh ◽  
D. Dashti ◽  
S. Al-Bahar ◽  
J. Chakkamalayath
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Moisture Retention ◽  
Coarse Aggregates

scholarly journals Sulfate Resistance of Recycled Aggregate Concrete with GGBS and Fly Ash-Based Geopolymer

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1247 ◽  
Author(s):  
Jianhe Xie ◽  
Jianbai Zhao ◽  
Junjie Wang ◽  
Chonghao Wang ◽  
Peiyan Huang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Construction Projects ◽  
High Performance ◽  
High Performance Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Aggregate Concrete ◽  
Sulfate Resistance ◽  
Coarse Aggregates

There is a constant drive for the development of ultra-high-performance concrete using modern green engineering technologies. These concretes have to exhibit enhanced durability and incorporate energy-saving and environment-friendly functions. The object of this work was to develop a green concrete with an improved sulfate resistance. In this new type of concrete, recycled aggregates from construction and demolition (C&D) waste were used as coarse aggregates, and granulated blast furnace slag (GGBS) and fly ash-based geopolymer were used to totally replace the cement in concrete. This study focused on the sulfate resistance of this geopolymer recycled aggregate concrete (GRAC). A series of measurements including compression, X-ray diffraction (XRD), and scanning electron microscopy (SEM) tests were conducted to investigate the physical properties and hydration mechanisms of the GRAC after different exposure cycles in a sulfate environment. The results indicate that the GRAC with a higher content of GGBS had a lower mass loss and a higher residual compressive strength after the sulfate exposure. The proposed GRACs, showing an excellent sulfate resistance, can be used in construction projects in sulfate environments and hence can reduce the need for cement as well as the disposal of C&D wastes.

Use of Ultra-High-Performance Concrete to Produce Standard Coarse Aggregates

2021 ◽  
Vol 50 (2) ◽  
pp. 20210013
Author(s):  
Késsia da Silva Conceição ◽  
Paulo César de Almeida Maia ◽  
Guilherme Chagas Cordeiro
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Ultra High Performance Concrete ◽  
Coarse Aggregates

An Evaluation on the Restrained Shrinkage of Ultra-High Performance Concrete

2012 ◽  
Vol 525-526 ◽  
pp. 449-452 ◽  
Author(s):  
Jung Jun Park ◽  
Doo Yeol Yoo ◽  
Sung Wook Kim ◽  
Young Soo Yoon
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Tensile Creep ◽  
Ring Test ◽  
Early Age ◽  
Restrained Shrinkage ◽  
Reinforcing Bars ◽  
Ultra High Performance Concrete ◽  
Shrinkage Cracking ◽  
Coarse Aggregates

Since ultra-high performance concrete (UHPC) is subject to large occurrence of shrinkage at early age due to its low water-to-cement ratio, the mixing of large quantities of powdered admixtures and the absence of coarse aggregates, UHPC presents large risks of shrinkage cracking caused by the restraints provided by the form and reinforcing bars. Accordingly, this study intends to evaluate the shrinkage behavior of UHPC under restrained state by performing restrained shrinkage test using ring-test. The test results reveal that increasing thickness of the inner ring increases the tensile creep at early age leading to the reduction of the average strain and residual stress of the inner ring.

EFFECTS OF COARSE PALM OIL CLINKER ON PROPERTIES OF SELF-COMPACTING LIGHTWEIGHT CONCRETE

2017 ◽  
Vol 79 (6) ◽  
Author(s):  
Owi Siew Feen ◽  
Roslli Noor Mohamed ◽  
Azman Mohamed ◽  
Nur Hafizah A. Khalid
Keyword(s):  
Palm Oil ◽  
Environmental Sustainability ◽  
High Performance ◽  
Lightweight Concrete ◽  
High Performance Concrete ◽  
Ultrasonic Pulse Velocity ◽  
Pulse Velocity ◽  
The Self ◽  
Hardened Concrete ◽  
Coarse Aggregates

Self-compacting lightweight concrete (SCLWC) is an innovative high performance concrete which uses palm oil clinker (POC), a waste by-product from the palm oil industry, as the lightweight aggregates. This paper presents a research on the effects of utilising only POC as coarse aggregates on the fresh and hardened properties of SCLWC. Properties of SCLWC were compared to self-compacting concrete (SCC) containing crushed granite aggregates. Tests of slump flow, V-funnel, J-ring, L box and sieve segregation were conducted to characterise the self-compactability in fresh state. The hardened concrete specimens were tested for density, water absorption, ultrasonic pulse velocity (UPV), compression, tensile splitting and flexural. Results revealed that both mixes had fulfilled the self-compactability requirements as per European Guidelines whereby the fresh SCLWC exhibited better filling ability and passing ability at low segregation resistance. The inclusion of coarse POC reduced the concrete density and strength, but the SCLWC exhibited good UPV values despite greater porosity in the concrete. It can be concluded that the POC can be potentially used as coarse aggregates for producing SCLWC to manage the waste and promote environmental sustainability. 

Influence of recycled coarse aggregates on normal and high performance concrete subjected to elevated temperatures

2016 ◽  
Vol 111 ◽  
pp. 368-378 ◽  
Author(s):  
Cléo Laneyrie ◽  
Anne-Lise Beaucour ◽  
Mark F. Green ◽  
Ronan L. Hebert ◽  
Béatrice Ledesert ◽  
...  
Keyword(s):  
High Performance ◽  
Elevated Temperatures ◽  
High Performance Concrete ◽  
Coarse Aggregates

A Study on the Use of Construction Wastes as Coarse Aggregates on High Performance Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 1525-1531
Author(s):  
Chung Ming Ho ◽  
Wei Tsung Tsai
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Mechanical And Thermal Properties ◽  
Loss On Ignition ◽  
Coarse Aggregates ◽  
Flow Test ◽  
Water To Cement Ratio

In recent years, because of rising consciousness on environmental protection and the lacking of construction waste dumping yards, recycling of construction wastes has been promoted extensively. The purpose of this study is to ascertain the effect on properties of the fresh and harden concrete replacing coarse aggregates by construction wastes under ambient and enhanced temperatures exposure. This research mainly concentrates on high performance recycled concrete (HPRC); by adding different amount of superplasticizer into the HPRC and to test and compare its mechanical and thermal properties with general high performance concrete (HPC). Thereafter, tests are carried out determine its compressive strength, residual strength after high temperature and the loss on ignition of the HPRC mixed with two water-to-cement ratios and different replacement proportions of recycled aggregates. Similar tests, such as the slump test and slump flow test, are carried out both on the HPRC and HPC. When the water-to-cement ratio is 0.3 and the amount of superplasticizer added is 1.2%, HPRC has the best performance. The specimens with 100% recycled aggregates were 31% below the control concrete sample in compressive strength at age of 28 days. By the way of adding admixture, the recycled concrete could reach the demand strength of the HPC. The results show that it is feasible to allow a higher replacement percentage of construction wastes for producing concrete products.

Preparation and Properties of High-Performance Concrete with Ceramic Coarse Aggregate

2016 ◽  
Vol 852 ◽  
pp. 1413-1420
Author(s):  
Ben Ying Wu ◽  
Xi Wu Zhou ◽  
Jin Zhong Lu
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Silica Fume ◽  
High Performance ◽  
Coarse Aggregate ◽  
High Performance Concrete ◽  
Splitting Tensile Strength ◽  
Water Penetration ◽  
Concrete Material ◽  
Coarse Aggregates

High-performance concrete was prepared by using ceramic waste as coarse aggregate. The influences of several factors, such as the contents of ceramic coarse aggregates, fly ashes and silica fumes, on the properties of concrete material were investigated. The results show that the compressive strength of semi-porcelain coarse aggregate concrete are slightly lower than that of natural concrete, and the splitting tensile strength and the ratio of compressive strength and splitting tensile strength is similar to the ones of natural concrete. After fly ash and silica fume mixed, the compressive strength, the splitting tensile strength and the resistance to water penetration of concrete with semi-porcelain coarse aggregate increase significantly with the increase of silica fume content which meet the requirements of high-performance concrete. Concrete with orcelain coarse aggregate is only suitable for low strength concrete.

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