Influences of concrete mechanical properties when using zeolite powder as admixture

2016 ◽  
pp. 453-455
Author(s):  
Q Liu
Keyword(s):  
Mechanical Properties ◽  
Concrete Mechanical Properties

scholarly journals Comparative Study of High-Performance Concrete Characteristics and Loading Test of Pretensioned Experimental Beams

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 427
Author(s):  
Pavlina Mateckova ◽  
Vlastimil Bilek ◽  
Oldrich Sucharda
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Raw Materials ◽  
Load Capacity ◽  
Materials Testing ◽  
Loading Test ◽  
Conventional Concrete ◽  
Concrete Mechanical Properties ◽  
Normal Strength

High-performance concrete (HPC) is subjected to wide attention in current research. Many research tasks are focused on laboratory testing of concrete mechanical properties with specific raw materials, where a mixture is prepared in a relatively small amount in ideal conditions. The wider utilization of HPC is connected, among other things, with its utilization in the construction industry. The paper presents two variants of HPC which were developed by modification of ordinary concrete used by a precast company for pretensioned bridge beams. The presented variants were produced in industrial conditions using common raw materials. Testing and comparison of basic mechanical properties are complemented with specialized tests of the resistance to chloride penetration. Tentative expenses for normal strength concrete (NSC) and HPC are compared. The research program was accomplished with a loading test of model experimental pretensioned beams with a length of 7 m made of ordinarily used concrete and one variant of HPC. The aim of the loading test was to determine the load–deformation diagrams and verify the design code load capacity calculation method. Overall, the article summarizes the possible benefits of using HPC compared to conventional concrete.

Study on the Mechanical Properties and Frost Resistance of Recycled Concrete Prepared by Village Construction Wastes

2011 ◽  
Vol 418-420 ◽  
pp. 406-410
Author(s):  
Jun Liu ◽  
Yao Li ◽  
Dan Dan Hong ◽  
Yu Liu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Frost Resistance ◽  
Cement Mortar ◽  
Strength Loss ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Replacement Rate ◽  
Concrete Mechanical Properties ◽  
Better Than

Abstract. Recycled aggregate—rural building material wastes pretreated by cement mortar—are applied into concrete with different replacement rates: 0, 25%, 50%, 75%, and 100%. Results from measurements of compressive strength, cleavage tensile strength, mass loss after fast freeze-thaw cycles, and compressive strength loss indicate that a different recycled aggregate replacement rate certainly influences concrete mechanical properties and frost resistance. Recycled aggregate replacement rates less than 75% performs better than common concrete. Data from the 100% replacement rate is worse than that of rates less than 75% but still satisfy the general demands of GB standard on C30 concrete.

scholarly journals Evaluation of Mechanical Properties of Concrete Reinforced with Eucalyptus globulus Bark Fibres

2020 ◽  
Vol 12 (23) ◽  
pp. 10026
Author(s):  
Claudia Mansilla ◽  
Mauricio Pradena ◽  
Cecilia Fuentealba ◽  
Andrés César
Keyword(s):  
Mechanical Properties ◽  
Eucalyptus Globulus ◽  
Industrial Waste ◽  
Concrete Strength ◽  
Natural Fibres ◽  
Experimental Program ◽  
Slight Reduction ◽  
Shrinkage Cracking ◽  
Acceptable Solution ◽  
Concrete Mechanical Properties

Concrete is a material with high compressive strength, but predisposed to shrinkage cracking, rapid cracks propagation, and brittle failures. The incorporation of fibre is an acceptable solution to reduce these limitations. However, high cost and energy consumption related to man-made fibres have placed natural fibres as an attractive sustainable alternative, especially considering that different natural fibres are industrial waste (as the Eucalyptus globulus bark fibre). Still, natural fibres can produce an important reduction of concrete strength. Hence, the objective of this study is to evaluate the effects of Eucalyptus globulus bark fibre in traditional concrete mechanical properties as compressive and flexural strength. For this, an experimental program was developed in such a way that reduces the results uncertainties and increases the power of decision regarding the percentage and fibre conditions of the samples. The results indicate that, unlike other natural fibres, the traditional mechanical properties have a slight reduction and acceptable workability. This fact is more evident in the samples with 0.50% fibre with respect to the weight of cement. Therefore, reinforcing mortars and concrete with Eucalyptus globulus bark fibres emerges as an eco-friendly building alternative to reuse this industrial waste.

Prediction of self-compacting recycled concrete mechanical properties using vibrated recycled concrete experience

2017 ◽  
Vol 131 ◽  
pp. 641-654 ◽  
Author(s):  
Iris González-Taboada ◽  
Belén González-Fonteboa ◽  
Juan Luis Pérez-Ordóñez ◽  
Javier Eiras-López
Keyword(s):  
Mechanical Properties ◽  
Recycled Concrete ◽  
Concrete Experience ◽  
Concrete Mechanical Properties

EFFECTS OF DIFFERENT SOURCES OF WATER ON THE PROPERTIES OF CONCRETE

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Ignatius Omuh ◽  
Rapheal Ojelabi ◽  
Adedeji Afolabi ◽  
Patience Tunji-Olayeni ◽  
Chukwuma Obi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
River Water ◽  
Potable Water ◽  
Tap Water ◽  
Construction Material ◽  
Well Water ◽  
Water Well ◽  
Concrete Mechanical Properties ◽  
Different Sources

Water is vital to human existence and life can only be sustained by it. Concrete is a widely used construction material and water is an important part of its composition. Potable water is what is recommended for concrete works, but unfortunately, some places do not have access to this. Places that do not have access to potable water might have access to other water sources that might be used for concrete works. This study was undertaken to investigate the effects of water from different sources on concrete mechanical properties. This study evaluates the characteristics of concrete produced with river water, well water, and potable tap water. Compressive strength and Density, were used to evaluate the characteristics of concrete specimens of mix ratios 1:2:4 and 1: 1 1/2 :3 produced with water from the different sources. The results showed that concrete specimens produced with tap water had the highest mean compressive strength at 28 days. While well water had the lowest compressive strength, it was concluded that well water was not suitable for concrete works even though it is already being used on some sites that can’t access tap water.

The Effect of Using Sugar-Cane Bagasse Ash as a Cement Replacement on the Mechanical Characteristics of Concrete

2020 ◽  
Vol 1002 ◽  
pp. 565-577
Author(s):  
Aamer Najim Abbas ◽  
Halah Al-Nealy ◽  
Abdulhadi Al-Saadi ◽  
Merza Imran
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Bond Strength ◽  
Mechanical Characteristics ◽  
Elevated Temperatures ◽  
Waste Product ◽  
Strength Test ◽  
Sugar Cane Bagasse ◽  
Concrete Mechanical Properties ◽  
Sugar Cane Bagasse Ash

This paper deals with the use of bagasse debris for sugarcane in concrete cement. The bagasse ash for sugarcane waste product. The bagasse ash is the waste material of the combustion of bagasse for energy in sugar plants. The bagasse debris is normally arranged in landfills and is presently effecting on a natural environment. Experimental work included pouring a concrete of C30 grade were and testing to investigate the concrete mechanical properties, slump test, elevated temperatures test and bond strength test. The bagasse ash was partially replaced with cement in percentages of (0, 3, 5, 7 and 10) % by of cement weight. The results of tests indicated that the best quantity was 7% by weight of cement gives the best compressive and tensile strength.

scholarly journals Prediction models for high-volume fly ash concrete practical application: Mechanical properties and experimental database

2021 ◽  
Vol 64 (1) ◽  
pp. 19-43
Author(s):  
Jelena Dragaš ◽  
Snežana Marinković ◽  
Vlastimir Radonjanin
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Prediction Models ◽  
High Volume ◽  
Cement Concrete ◽  
Experimental Database ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash ◽  
Concrete Mechanical Properties ◽  
Similar Accuracy

The analysis of available experimental results of high-volume fly ash concrete mechanical properties showed that extensive amount of research had been done so far. However, a comprehensive analysis of basic high-volume fly ash concrete mechanical properties was not found in the literature. Having that in mind, the database of 440 high-volume fly ash concrete and 151 cement concrete mixtures collected from literature was made. The application of European Code EN 1992-1-1 prediction models for cement concrete mechanical properties, as well as existing proposals for high-volume fly ash concrete properties, were statistically evaluated on the results from the database. The analysis showed that the prediction models defined in EN 1992-1-1 for compressive strength, tensile strength and for modulus of elasticity can be used for high-volume fly ash concrete, in the given form or with modifications proposed in literature, with similar accuracy and variation of results as for cement concrete. Own model for fly ash efficiency prediction was developed.

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