The Influence of Polymer and Organic Fiber on the Strength of Light Aggregate Concrete

2013 ◽  
Vol 753-755 ◽  
pp. 500-503
Author(s):  
Li Guang Xiao ◽  
Gang Liu ◽  
Yuan Li
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Foam Plastic ◽  
Polystyrene Foam ◽  
Aggregate Concrete ◽  
Organic Fiber ◽  
Waste Polystyrene ◽  
Insulation Performance

As a kind of high performance concrete, light aggregate concrete has the following advantages, for example lightweight high strength, thermal insulation performance, seismic performance, refractory, penetration-proof performance and so on. This experiment with EPS particles which are made of ceramsite and waste polystyrene foam plastic as light aggregate and fly ash as admixture prepare light aggregate concrete, research the influence of polymer and organic fiber on the strength of light aggregate concrete, and analysis of the microstructure and mechanism, the experimental results indicate that polymer and organic fiber can effectively improve the microstructure of light aggregate concrete and the interface of light aggregate and cement paste, significantly improve the strength of light aggregate concrete and reduce its brittleness.

Autogenous Volume Deformation and Creep Properties Analysis of C60 High Performance Concrete and C60 High Strength Concrete

2013 ◽  
Vol 639-640 ◽  
pp. 364-367 ◽  
Author(s):  
Xiao Bo Chen ◽  
Jian Yin ◽  
Wei Min Song
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Engineering Practice ◽  
Volume Deformation ◽  
Creep Properties ◽  
Strength Concrete ◽  
Creep Coefficient

Based on engineering practice, autogenous volume deformation and creep properties of C60 high performance concrete(C60 HPC) and C60 high strength concrete(C60 HSC) were evaluated in the study. The results showed that the cement partly-replaced with fly ash could significantly decrease the creep deformation, creep coefficient and creep degree. In comparison with C60 HSC, the creep coefficient and creep degree of C60 HPC were decreased 17.9％and15.8％ in 28 days, 22.9% and 21.0% in 270 days. For C60 HPC and C60 HSC at the same age, autogenous volume deformation of C60 HPC is greater than that of C60 HSC, but they were both less than 80×10-6 , and the autogenous volume deformation was basically completed in 7 days.

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.

scholarly journals Experimental Characterization of Prefabricated Bridge Deck Panels Prepared with Prestressed and Sustainable Ultra-High Performance Concrete

2020 ◽  
Vol 10 (15) ◽  
pp. 5132
Author(s):  
Muhammad Naveed Zafar ◽  
Muhammad Azhar Saleem ◽  
Jun Xia ◽  
Muhammad Mazhar Saleem
Keyword(s):  
High Performance ◽  
Bridge Deck ◽  
High Performance Concrete ◽  
High Strength ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Ultra High Performance Concrete ◽  
Aggregate Concrete ◽  
Deck Panels

Enhanced quality and reduced on-site construction time are the basic features of prefabricated bridge elements and systems. Prefabricated lightweight bridge decks have already started finding their place in accelerated bridge construction (ABC). Therefore, the development of deck panels using high strength and high performance concrete has become an active area of research. Further optimization in such deck systems is possible using prestressing or replacement of raw materials with sustainable and recyclable materials. This research involves experimental evaluation of six full-depth precast prestressed high strength fiber-reinforced concrete (HSFRC) and six partial-depth sustainable ultra-high performance concrete (sUHPC) composite bridge deck panels. The composite panels comprise UHPC prepared with ground granulated blast furnace slag (GGBS) with the replacement of 30% cement content overlaid by recycled aggregate concrete made with replacement of 30% of coarse aggregates with recycled aggregates. The experimental variables for six HSFRC panels were depth, level of prestressing, and shear reinforcement. The six sUHPC panels were prepared with different shear and flexural reinforcements and sUHPC-normal/recycled aggregate concrete interface. Experimental results exhibit the promise of both systems to serve as an alternative to conventional bridge deck systems.

scholarly journals Development of quaternary blended high performance concrete made with high reactivity metakaolin

2018 ◽  
Vol 7 (2.1) ◽  
pp. 79 ◽  
Author(s):  
V Srinivasa Reddy ◽  
R Nirmala
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Research Work ◽  
High Strength ◽  
Supplementary Cementitious Materials ◽  
Ternary Blend ◽  
Strength Development ◽  
Strength Grade

In the last three decades, supplementary cementitious materials such as fly ash, silica fume and ground granulated blast furnace slag have been judiciously utilized as cement replacement materials as these can significantly enhance the strength and durability characteristics of concrete in comparison with ordinary Portland cement (OPC) alone. Hence, high-performance concretes can be produced at lower water/powder ratios by incorporating these supplementary materials. One of the main objectives of the present research work was to investigate synergistic action of binary, ternary and quaternary blended high strength grade (M80) concretes on its compressive strength. For blended high strength grade (M80) concrete mixes the optimum combinations are: Binary blend (95%OPC +5% FA, 95%OPC +5% MS and 95%OPC +5%MK), ternary blend (65%OPC+20%FA+15%MS) and quaternary blend (50%OPC+28%FA+11%MS+11%MK). Use of metakaolin in fly ash based blended concretes enhances compressive strength significantly and  found to be cost effective in terms of less cement usage, increased usage of fly ash and also plays a major role in early strength development  of fly ash based blended concrete.  

Application of High-Performance Concrete to High-Rise Building in Taiwan

2001 ◽  
Vol 4 (2) ◽  
pp. 65-73 ◽  
Author(s):  
Ping-Kun Chang ◽  
Chao-Lung Hwang ◽  
Yaw-Nan Peng
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Cement Content ◽  
Flow Characteristics ◽  
High Strength ◽  
Design Strength ◽  
Design Algorithm ◽  
High Rise ◽  
One Year

The research and development of high-performance concrete (HPC) that can give both high flow characteristics and high strength have attracted wide interest in Taiwan. The construction of the 101-storey Taipei Financial Center and the 85-storey Tungtxt & Chingtai (T&C) Tower requires the slump to be in the range of 230 – 270 mm, the initial slump flow in the range of 580 – 620 mm and slump more than 230 mm after 45 minutes, as well as a 56-day compressive strength of over 56 MPa. The HPC mix is designed using a densified mixture design algorithm which aims to achieve the lowest cement content. With the addition of pozzolanic materials such as fly ash, the workability is much improved because the shape of fly ash is spherical. After one-year of strict quality control, the HPC achieve consistent workability and excellent strength. This indicates that the appropriate use of local industrial by-product materials can produce HPC of the required design strength.

scholarly journals PENENTUAN KOMPOSISI OPTIMUM BETON MARINE BERBASIS KONSEP REABILITAS

2017 ◽  
Vol 11 (1) ◽  
pp. 46
Author(s):  
Armin Naibaho
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Extreme Condition ◽  
High Fracture ◽  
Marine Concrete ◽  
Fly Ash Utilization ◽  
Market Construction

The terminology ’marine concrete’ resrved for concrete material to structures in the marine area extreme condition. Many civil engineering building in the suburban sea area, for example dock and retaining scouring waves wall. Be expected of this fly ash utilization of waste can answer market (construction world) request to readymix concrete request with price which more economial but with quality which stay awake. This observation purpose to: (1) determining the optimum composition to concrete in the moring area (with extreme condition) with involves these aspecks as “high performance concrete “ that is : high strength, high fracture resistance, low permeability, shrinkage controlled creep,(2). Study of interface zone condition with involves aspects of cohesion to determine Mode I Fracture Resistance.Based on the results of analysis and discussion, so we have: (1). Show that the used of the number fly ash 10% will produce the greatest compressive strength-caracteristik  =  58,56 MPa, whereas without the used of fly ash ( 0 %) obtained  =  56,44 MPa, (2). Calculation of probability and reability obtained values: to tested specimen which do not use fly ash (0%; Reliability is ↔ R = 1 – P  = 1 – 0,72 = 0,28 and the addition of 10% fly ash, obtained Reliability is ↔ R = 1 – P  = 1 – 0,70 = 0,30.Suggested the need for the selection of quality materials, procedures In the implemention and maintenance of  the test specimen after casted suggested thats need tight control to produce compressive strength field in maximum.  Keywords : marine concrete, fly ash, compressive strength, mixture variatio, probability and reability.

scholarly journals Performance Evaluation of High-Strength High-Volume Fly Ash Concrete

2019 ◽  
Vol 8 (3) ◽  
pp. 5990-5994 ◽  
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
High Volume ◽  
Absorption Capacity ◽  
Strength Gain ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash

In the present study, high strength high volume fly ash concrete of M70 grade is developed and its durability properties such as water absorption capacity, porosity, and sorptivityare ascertained. It was found that high volume fly ash does not yield high strength so silica fume is added for early strength gain and for later strength gain lime required for complete pozzolonic action is added to achieve high performance concrete. In this study after testing for various combinations of quaternary blended concrete it was reported that 30% cement +70% fly ash as total powder achieves high strength of nearly 70 MPa, when silica fume of 10% by weight of powder and 30% of lime by weight of powder are added to the total powder content. The high strength high volume concrete developed with this optimum quantities of quaternary blends will be evaluated for the performance.It was found that water absorbtion in high strength high volume fly ash concrete reduced by nearly 85% and porosity is reduced by 34%.

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