Mega High Rise Buildings – Strength and E-modulus limits for High Performance Concrete in Malaysia.

2018 ◽  
Author(s):  
Kribanandan Gurusamy Naidu
Keyword(s):  
Theoretical Basis ◽  
High Performance ◽  
High Performance Concrete ◽  
Kuala Lumpur ◽  
Innovative Design ◽  
High Rise ◽  
Local Resources ◽  
The Cost ◽  
Selection Of

<p>In the early 1990s the Petronas Twin Towers Project in Kuala Lumpur, set the stage for the use of high performance concretes of &gt;C80/95 for high rise construction worldwide. In the intervening years the rapid increase in the cost of land in cities due to urbanization accelerated the appetite for mega high rise buildings, inevitably &gt; 50 stories, having to be built on ever more constrained spaces. In this context high performance concrete of Grades well in access of C80/95 is now becoming commonly specified in design.</p><p>This paper explores the development of HPC in Malaysia from the time of the Petronas Twin Tower project in the mid 90’s and the constraints and limitations which exist in the use of higher grades of concrete for design. It also provides designers a theoretical basis for the selection of e- modulus to undertake innovative design based on available local resources.</p>

scholarly journals Estimation of Super High-Rise Pumping Pressure for High-Performance Concrete Based on Computational Fluid Dynamics Modeling and Situation Measurement

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Weijiu Cui ◽  
Chuankai Zhao ◽  
Sheng Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Calculation Method ◽  
Pressure Loss ◽  
High Performance ◽  
High Performance Concrete ◽  
Accurate Method ◽  
Dynamics Modeling ◽  
High Rise ◽  
Pipe Line

Traditional methods fail to predict the pumping pressure loss of high-performance concrete properly in super high-rise pumping situations due to complex changes of concrete properties. Therefore, it is imperative to propose a relative accurate method for pumping pressure estimation in super high-rise buildings. This paper builds the simplified pressure calculation method “pressure induced by the gravity plus pressure along the pipe line.” The later one is gained by establishing topology optimized model based on computational fluid dynamics and considering the lubrication layer formation. The effect of rheological properties and flow rate is analyzed based on this model in detail. Furthermore, the developed calculation method is verified by the measured pumping pressure during the super high-rise building construction of the Shanghai Tower (the tallest building in China recently). The relative differences between the calculation results and the measured data in situ are less than 6%, indicating the applicability of this method for predicting the pressure loss of the super high-rise pumping.

scholarly journals Ultra-high-performance concrete with local high unburned carbon fly ash

DYNA ◽  
2021 ◽  
Vol 88 (216) ◽  
pp. 38-47
Author(s):  
Joaquín Abellán García ◽  
Nancy Torres Castellanos ◽  
Jaime Antonio Fernandez Gomez ◽  
Andres Mauricio Nuñez Lopez
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Unburned Carbon ◽  
High Tech ◽  
Ultra High Performance Concrete ◽  
Conventional Concrete ◽  
The Cost

Ultra-high-performance concrete (UHPC) is a kind of high-tech cementitious material with superb mechanical and durability properties compared to other types of concrete. However, due to the high content of cement and silica fume used, the cost and environmental impact of UHPC is considerably higher than conventional concrete. For this reason, several efforts around the world have been made to develop UHPC with greener and less expensive local pozzolans. This study aimed to design and produce UHPC using local fly ash available in Colombia. A numerical optimization, based on Design of Experiments (DoE) and multi-objective criteria, was performed to obtain a mixture with the proper flow and highest compressive strength, while simultaneously having the minimum content of cement. The results showed that, despite the low quality of local fly ashes in Colombia, compressive strength values of 150 MPa without any heat treatment can be achieved.

Technology of Ultra-High Strength / High Performance Concrete Applied to Guangzhou Xita Tower Construction

2009 ◽  
Vol 405-406 ◽  
pp. 1-4 ◽  
Author(s):  
Hao Wen Ye
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Autogenous Shrinkage ◽  
High Strength ◽  
Hardened Concrete ◽  
High Rise ◽  
Slump Flow ◽  
Mix Proportion ◽  
New City ◽  
Pumping Equipment

This paper introduces development and application of ultra-high strength/high performance concrete in construction of the Xita tower high-rise building at Zhujiang New City of Guangzhou, China. The goal of the concrete construction in the Xita Tower project will be realized via research of mix proportion and optimization of pumping equipment. In regard to mix proportion of concrete, low water/cement (W/C) ratio, low water content lower than 150 kg/m3 and employment of superplasticizer are essential to acquire high strength. A series of parameters have been measured to research workability of concrete from C70 to C90, such slump, slump flow, flow time from inverted cone, L-box flow, and bleeding under pressure et al. Properties of hardened concrete should also be considered, including durability, autogenous shrinkage caused cracking, and fire resistance.

scholarly journals ANÁLISE CUSTO-BENEFÍCIO ENTRE CONCRETO CONVENCIONAL E CONCRETO DE ALTO DESEMPENHO - ESTUDO DE CASO DE UM EDIFÍCIO RESIDENCIAL

2021 ◽  
Vol 9 (205) ◽  
pp. 1-34
Author(s):  
LARA BARBOSA DE SOUZA SANTOS
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Cost Benefit ◽  
Structural Elements ◽  
Conventional Concrete ◽  
Benefit Ratio ◽  
First Case ◽  
Consumption Rates ◽  
Cost Benefit Ratio ◽  
The Cost

The present study makes a comparative analysis of the cost-benefit ratio between Conventional Concrete (CC) and High Performance Concrete (CAD). To obtain the consumption rates of concrete, steel and shape of each case, two studies of the same structure were carried out, changing only one variable: the characteristic strength of concrete to compression (fck). In the first case, the 25 Megapascal fck (MPa) representing the CC was applied, and in the second case, 50 MPa fck corresponding to the CAD. For analysis of the structural elements, the Cypecad Software was used. It was found that one of the initial hypotheses, that the consumption of concrete, steel and form would decrease with the use of CAD, was confirmed. The second hypothesis, that the CAD would be more financially advantageous than the CC, was not confirmed, but factors that may have led to this non-confirmation were pointed out.

scholarly journals Damage Assessment using Acoustic Emission on Concrete Beam

2020 ◽  
Vol 9 (3) ◽  
pp. 2977-2981
Keyword(s):  
Acoustic Emission ◽  
Damage Assessment ◽  
High Performance ◽  
High Performance Concrete ◽  
Bending Test ◽  
Ultra High Performance Concrete ◽  
Reliable Technique ◽  
Damage Level ◽  
Three Point Bending ◽  
Selection Of

The selection of reliable technique for damage assessment is important in civil engineering structure. The present study proposed Acoustic emission (AE) technique by using the fundamental AE parameter to evaluate damage accumulated on Ultra High-Performance Concrete (UHPC) specimens. The UHPC beam with dimension of 515 mm x 98 mm x 98 mm was tested under three-point bending test with stepwise flexural load. In order to detect and to collect the AE data, Micro-SAMOS (μ-SAMOS) digital AE system and R6I sensors type were used while data analyses were carried out using AEwin software. The damage level that take place during increasing static loading on tested concrete beams and the mechanism was successfully evaluated using the AE technique.

scholarly journals Features of calculations of the limit cost of high-rise constructions for housing and civil purposes with the use of consolidated standards

2018 ◽  
Vol 193 ◽  
pp. 05037
Author(s):  
Andrei Ovsiannikov ◽  
Anna Vorotyntseva ◽  
Vladimir Bolgov
Keyword(s):  
Cost Of Capital ◽  
Correction Factors ◽  
Price Determination ◽  
High Rise ◽  
Additional Correction ◽  
Capital Construction ◽  
The Cost ◽  
Cost Factors ◽  
Initial Price ◽  
Selection Of

When determining the cost of capital construction objects, for purposes of pre-investment workings out and purposes of initial maximum initial price determination on tenders, construction price norms are used (CPNs). Modern CPNs are not designed to determine the value of high-rise buildings. It is necessary to adapt modern CPNs to get opportunity for the possibility to take into account special cost factors in determining the cost of high-rise buildings. The main ways can be: selection of new representative objects or application of additional correction factors.

Optimized Cost of High Performance Concrete in the Build

2014 ◽  
Vol 911 ◽  
pp. 479-483 ◽  
Author(s):  
Samir Bouhedja ◽  
Boualem El Kechebour ◽  
Ahmed Boukhaled
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Economic Benefits ◽  
Reinforced Concrete Structures ◽  
National Plan ◽  
Conventional Concrete ◽  
Ordinary Concrete ◽  
Morphology And Structure ◽  
The Cost

The objective of this work is an analysis of the use of high performance concrete and it impact on the morphology and structure costs. The use of high performance concrete (HPC) in the construction of buildings and civil engineering works offers advantages in terms of durability, ease of implementation, reduction of deformation and shrinkage, increase the resistance of reinforced concrete structures. The economic benefits of the use of high performance concrete, compared to conventional concrete are illustrated by the reduction of the following costs: the implementation of concrete, the geometric sections of bearing elements of the built space and the maintenance of structures. The cost of high performance concrete, for the resistance inferior to 80 Mpa, gives a significative advantage comparatively to the steel and the ordinary concrete. The generalized use of this type of concrete in many countries has been stimulated by a national plan.

Future Research Trends in High-Performance Concrete: Cost-Effective Considerations

1997 ◽  
Vol 1574 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Chao-Lung Hwang ◽  
Long-Sherng Lee
Keyword(s):  
Cycle Length ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Material ◽  
Cost Effective ◽  
Research Trends ◽  
Future Research ◽  
Ongoing Research ◽  
Ordinary Concrete ◽  
High Rise

High-performance concrete (HPC) prepared on the basis of eugenic considerations (cost-effectiveness and life-cycle length) is proposed to resolve actual concrete problems. HPC is safe, durable, workable, economical, and ecologically sound. Concrete in Taiwan is always designed with large amounts of water and paste (even though it is generally accepted that the concrete will tend to crack and deteriorate). Therefore, HPC with fewer problems is the target of ongoing research. Eugenic HPC is produced from ordinary concrete, superplasticized concrete, pozzolanic concrete, and high-flowing concrete. Without the drawbacks of past forms of concrete, eugenic HPC is a better construction material on the basis of individual material characteristics. The characteristics of eugenic HPC are presented and illustrated by two high-rise buildings in Taiwan constructed with high-flowing HPC.

scholarly journals PENGARUH PENAMBAHAN SERAT BAJA TERHADAP SIFAT MEKANIS REACTIVE POWDER CONCRETE

2020 ◽  
Vol 3 (2) ◽  
pp. 49
Author(s):  
Shandy Trisakti paiding Lewa ◽  
Patria Kusumaningrum
Keyword(s):  
High Performance ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Steel Fibers ◽  
Reactive Powder Concrete ◽  
High Rise ◽  
High Rise Building ◽  
Fine Aggregates ◽  
Reactive Powder ◽  
Column Base

<p><em>As urban growth increase, massive high-rise building construction become a critical solution. In high-rise building, column base may be subjected to very high axial load from the upper stories and may experience very large moment due to the lateral loads. As a result, the column base requires a great deal amount of reinforcement which make it very cramped. In order to prevent honeycomb as the reinforcement gap is narrow yet difficult to provide sufficient vibration during concrete casting, high performance concrete (HPC) may be the solution. One of the HPC innovations is Reactive Powder Concrete (RPC). RPC is a self-compacting type of HPC contains well graded fine and super fine aggregates with cement and pozzolanic material to strengthen the Interfacial Transition Zone (ITZ) between the mortar matrix and fine aggregates. RPC may achieve high compressive strength as the mix uses low water to cement ratio, thus it introduces less void and no coarse aggregates, thus ITZ is stronger. RPC has similar characteristic as concrete, with its brittle behaviour. To avoid the brittle failure of RPC, in this study steel fibers are added into the RPC mixture. This research is conducted to examine the effectiveness of using steel fibers on the mechanical properties of Steel Fiber Reactive Powder Concrete (SFRPC). </em><em>The steel fiber is aimed to increase ductility of tensile strain hardening condition by its multiple crack-bridging behavior.</em></p>

scholarly journals Optimal Selection of High-Performance Concrete for Post-Tensioned Girder Bridge Using Advanced Hybrid MCDA Method

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6553
Author(s):  
Elżbieta Janowska-Renkas ◽  
Przemysław Jakiel ◽  
Dariusz Fabianowski ◽  
Damian Matyjaszczyk
Keyword(s):  
Decision Making ◽  
High Performance ◽  
High Performance Concrete ◽  
Evaluation Criteria ◽  
Analytic Hierarchy ◽  
Solution Methods ◽  
Post Tension ◽  
Girder Bridge ◽  
Research On Application ◽  
Selection Of

The selection of material solutions is a basic decision-making problem that occurs in engineering issues. It affects the entire life cycle of a building structure, its safe use, maintenance costs, and a need to meet requirements for sustainable development, including recycling. This paper aims at selection of the optimum composition of HPC designed for monolithic girder structures of post-tension bridges. For the analysis, a set of 12 new-generation concretes (HPC) was designed, made, and tested. A full-scope set of evaluation criteria was created and then the optimal alternative was selected. For this purpose, an advanced hybrid algorithm combining EA FAHP (Extent Analysis Fuzzy Analytic Hierarchy Process) and FuzzyTOPSIS (Fuzzy Technique for Order Preference by Similarity to an Ideal Solution) methods was used. The obtained results indicate a possibility for the practical application of the proposed algorithm by decision-making engineering staff. It can also be the basis for further research on application compared to other material and design solutions and, depending on the issue, different combination of aggregated methods.

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