The Evaluation Model of Quality of High Performance Concrete Construction Based on the Unascertained Measure

2009 ◽  
Author(s):  
Chang-long Wang ◽  
Jin-yun He ◽  
Hong-jun Gao
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Evaluation Model ◽  
Concrete Construction

Applying Research on Testing Compressive Strength of High Performance Concrete with Rebound Method

2012 ◽  
Vol 452-453 ◽  
pp. 106-109
Author(s):  
Zheng Jun Wang ◽  
Felix Zhao
Keyword(s):  
Compressive Strength ◽  
Concrete Structure ◽  
High Performance ◽  
High Performance Concrete ◽  
Cement Concrete ◽  
Construction Quality ◽  
Concrete Construction ◽  
Estimation Models

In order to grasp timely and accurately quality of high performance concrete, detection of compressive strength of high performance concrete can be non-destructively, rapidly and accurately tested that is very testing index. The paper did some research on compressive strength of high performance concrete applying redound method that it established several estimation models between rebound value and compressive strength. Experiment shows that rebound method can effetely test compressive strength of high performance concrete. Construction quality of Cement concrete structure can timely grasp applying the method.

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.

scholarly journals An Auto-Calibrating Semi-Adiabatic Calorimetric Methodology for Strength Prediction and Quality Control of Ordinary and Ultra-High-Performance Concretes

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 96
Author(s):  
Marco Viviani ◽  
Luca Lanzoni ◽  
Vincenzo Savino ◽  
Angelo Marcello Tarantino
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
Ultra High Performance Concrete ◽  
Structural Element ◽  
Construction Operations ◽  
Equivalent Time ◽  
Normal Strength ◽  
Good Agreement

A timely knowledge of concrete and ultra-high-performance concrete (UHPC) strength is possible through the so-called strength-equivalent time (Et) curves. A timely knowledge of concrete strength is useful, for instance, to precisely determine when the shores of a hardening structural element can be safely removed. At the present time, the preparation of the strength-Et curves requires time-consuming and labor-intensive testing prior to the beginning of construction operations. This paper proposes an innovative method to derive the strength-Et and total heat-Et curves for both normal strength and UHPC. Results confirmed that the proposed method is fast, inexpensive, self-calibrating, accurate and can detect any variation of the concrete mix proportions or components quality. In addition, the quality of predictions of strength–maturity curves can be constantly improved as the specimens’ population increases. Finally, results obtained with the proposed method were compared with those obtained using standard methods, showing a good agreement.

scholarly journals Behaviour of GGBS and ROBO Sand Replaced High Performance Concrete

2019 ◽  
Vol 8 (12) ◽  
pp. 5773-5776
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Unit Cost ◽  
Mechanical Tests ◽  
Split Tensile Strength ◽  
Granulated Blast Furnace Slag ◽  
Points Of Interest ◽  
Shrinkage And Creep ◽  
Furnace Slag

The utilization of superior strength concrete offers points of interest in durability, simplicity of position, and decreased shrinkage and creep, just as expanded compressive, shear and rigidity. Balancing these favorable circumstances are possibly diminished flexibility and imperviousness to fire, and expanded unit cost. The present paper centers around the researching attributes of M50 evaluation concrete with replacement of cement with Ground Granulated Blast Furnace Slag (GGBS) and sand with the ROBO sand (crusher dust). The solid concrete cubes and cylinders are tried for compressive and split tensile strength. It is discovered that by replacement of cement with GGBS and the sand with ROBO sand helped in improving the quality of the solid considerably contrasted with ostensible blend concrete. The compressive quality is learned at 7days, 28 days. Water decreasing admixtures are utilized to expand functionality qualities. For all degrees of bond substitution cement accomplished predominant execution in the crisp and mechanical tests ought to be contrasted and the reference blend.

scholarly journals Evaluation of suitability for 3D printing of high performance concretes

2018 ◽  
Vol 163 ◽  
pp. 01002 ◽  
Author(s):  
Maria Kaszyńska ◽  
Marcin Hoffmann ◽  
Szymon Skibicki ◽  
Adam Zieliński ◽  
Mateusz Techman ◽  
...  
Keyword(s):  
3D Printing ◽  
High Performance ◽  
High Performance Concrete ◽  
Visual Quality ◽  
Multilayered Structures ◽  
Concrete Mix ◽  
Mineral Additives ◽  
Printing Speed

The article presents overview of additive manufacturing for concrete structures. Study focuses on specific tests used to determine suitability of high performance mixes for 3D printing. The tests include determination of compressive strength and evaluation of printing speed, extrudability and overall surface quality. Tests were performed on a High-Performance Concrete mix with fine natural aggregate up to 2 mm. Mineral additives such as silica fume and fly ash, and superplasticizer were added to obtain proper consistency. The tests were performed using specially designed site consisting of Cartesian robot and pumping module. The design of printed paths were tailored for specific tests. The evaluation of pump performance was made by measuring pumped mix volume in time. The determination of correct pumping speed was made based on the visual quality of the printed layers. Study determines also the ability to print multilayered structures and printability window of proposed mix.

Study on Application of Concrete Admixture Technology

2013 ◽  
Vol 438-439 ◽  
pp. 54-57
Author(s):  
Wen Cui
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Field Application ◽  
Hydration Heat ◽  
Mix Design ◽  
Shrinkage Stress ◽  
Simulation Test

Mix design of high performance concrete was determined based on the pumping simulation test. It was indicated by test and field application that the trimixture technique and the double mixture technique can improve the pump of concrete, reduce the dosage of cement and the hydration heat; adding expansion agent can prevent harmful cracks in the concrete due to shrinkage stress, improve the compactness and impermeability. The reasonable construction technologies were used in mixing, transportation, pouring, vibrating and curing of the concrete in order to ensure quality of the construction.

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