Relationship between methylene blue values of concrete aggregate fines and some concrete properties

2008 ◽  
Vol 35 (4) ◽  
pp. 379-383 ◽  
Author(s):  
İlker Bekir Topçu ◽  
Abdullah Demir
Keyword(s):  
Methylene Blue ◽  
Clay Content ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Concrete Properties ◽  
Ready Mixed Concrete ◽  
Methylene Blue Value

The fine granular structure and surface activity of clay minerals increase the amount of mixing water needed to provide workability in concrete. Even when the microfine material percentage in fine aggregate is low, the methylene blue value of the fine aggregate increases when materials of clay origin are present. In this study, methylene blue values were determined in fine aggregate samples used to produce ready-mixed concrete. Samples were taken from four different aggregate quarries, and relationships between methylene blue values of the concrete samples produced with these aggregates and some of their properties were investigated. Tests were done to determine the quality of microfine material (i.e., passing 0.063 mm sieve). Slump, ultrasonic pulse velocity, compressive strength, and surface abrasion resistance tests were performed on concretes made with these aggregate fines. It is shown that clay content, as indicated by the methylene blue value test, affects the concrete properties, but the microfine material percentage does not give any hint about clay content.

Recycling of Waste Limestone as Fine Aggregate for Conventional and Green Concretes

2018 ◽  
Vol 928 ◽  
pp. 257-262 ◽  
Author(s):  
Trong Phuoc Huynh ◽  
Chao Lung Hwang ◽  
Si Huy Ngo
Keyword(s):  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Concrete Mixture ◽  
Engineering Properties ◽  
Fine Aggregate ◽  
Normal Concrete ◽  
Design Algorithm ◽  
Green Concrete ◽  
Concrete Mixtures

This paper presents the results of the experimental works to investigate the use of waste limestone from water treatment industry as fine aggregate in green concrete. Two concrete mixtures with a constant water-to-binder ratio of 0.3 were prepared for this investigation, in which, the normal concrete mixture was designed following the guidelines of ACI 211 standard, while the green concrete mixture was designed using densified mixture design algorithm (DMDA) technology. For comparison, both types of concrete samples were subjected to the same test program, including fresh properties, compressive strength, strength efficiency of cement, drying shrinkage, electrical surface resistivity, ultrasonic pulse velocity, and thermal conductivity. Test results indicate that both concrete mixtures showed the excellent workability due to the round-shape of waste limestone aggregate and the use of superplasticizer. In addition, the green concrete mixture exhibited a better performance in terms of engineering properties and durability in comparison with the normal concrete mixture. The results of the present study further support the recycling and reuse of waste limestone as fine aggregate in the production of green concrete.

Recycled Concrete Using Crushed Construction Waste Bricks Subject to Elevated Temperatures

2010 ◽  
Vol 152-153 ◽  
pp. 1-10
Author(s):  
Chung Ming Ho ◽  
Wei Tsung Tsai
Keyword(s):  
Compressive Strength ◽  
Residual Strength ◽  
Elevated Temperatures ◽  
Plain Concrete ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Recycled Concrete ◽  
Fine Aggregate ◽  
Term Performance

The objectives of this paper are to find the compressive strength and ultrasonic pulse velocity (UPV) of recycled concrete with various percentages of natural fine aggregate replaced by Recycled brick fine aggregate (RBFA) as well as the residual strength and residual UPV of recycled concrete subjected to elevated temperatures. Experiment results showed that the compressive strength and UPV decreased as amount of RBFA in concrete increased, the long-term performance of compressive strength and UPV development increased as the RBFA content increased. The residual strength of recycled concrete increased slightly after heating to 300°C and the residual UPV of recycled concrete decreased gradually as the exposed temperature increased beyond 300°C. In the range of 580 -800°C, recycled concrete lost most of its original compressive strength and UPV. After subjected to the temperature of 800°C, compared to plain concrete, recycled concrete with 100% RBFA had a greater discount rate of compressive strength and UPV of the order of 5-15% and 6-10%. Regression analysis results revealed that the residual strength and residual UPV of recycled concrete had a high relevance after elevated temperatures exposure.

scholarly journals Effect of Stone Dust on the Mechanical and Microstructural Properties of Opc based Concrete Subjected to Acid Exposure

2019 ◽  
Vol 8 (3) ◽  
pp. 7488-7492 ◽  
Keyword(s):  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Acid Exposure ◽  
Fine Aggregate ◽  
Cell Potential ◽  
Stone Dust ◽  
Different Types ◽  
Mechanical And Microstructural Properties

A separate approach of sustainable development is to make the structures durable. More durable structures need to be replaced less frequently and will reduce the need for cement. Such increase in durability can be achieved by choosing appropriate mix designs and selecting suitable aggregates and admixtures. In this experiment sand (fine aggregate) is partially replaced by stone dust to make the concrete mix sustainable in nature. This study also investigates the durability of different types of concrete in acid exposure. Cube compressive strengths of different mixes have been compared to see how the concrete strength differs from original mixes. In addition different types of non-destructive tests such as ultrasonic pulse velocity test, rebound hammer test and half-cell potential tests have also been performed on the concrete samples for better analysis of their strength and durability characteristics. Specimens were analysed through the Scanning Electron Microscope to understand the microstructural changes of concrete samples. Energy dispersion X-ray analysis was also done to understand the changes in the nature of the hydration products of some specimen.

scholarly journals Empirical Formula for Assessment Concrete Compressive Strength by Using Ultrasonic Pulse Velocity

2018 ◽  
Vol 7 (4.20) ◽  
pp. 113
Author(s):  
Hameed Shakir Al-Aasm
Keyword(s):  
Compressive Strength ◽  
Empirical Formula ◽  
Salt Content ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Fine Aggregate ◽  
Acceptable Error ◽  
Statistical Program ◽  
Compressive Strength Of Concrete

Statistical practical program was carried out to establish a fairly accurate empirical formula between compressive strength of concrete and ultrasonic pulse velocity. The work has a strong empirical base, but it is firmly governed by theory. In concrete, the compressive strength of concrete is related to the type, proportion and physical properties of aggregate but it is well known to be intensely affected by the properties of the cement paste, which relate, mainly, to the w/c ratio. The other variables such as age and density of concrete, salt content in fine aggregate and curing method have a relatively little effect on compressive strength of concrete. Therefore, the program involves field testing of reinforced concrete members that their w/c ratio and cube uniaxial compressive strength are known. The results were used as input data in statistical program (SPSS) to develop an empirical formula between the compressive strength of concrete and ultrasonic pulse velocity. The proposed formula was confirmed by the results of previous experiments. Although the relationship between the compressive strength of concrete and ultrasonic pulse velocity physically indirect, the statistical program revealed that the pulse velocity test could be used with acceptable error in evaluating the compressive strength of concrete.  

Correlation between the porosity and ultrasonic pulse velocity of recycled aggregate concrete at different saturation levels

2017 ◽  
Vol 44 (11) ◽  
pp. 911-917 ◽  
Author(s):  
Kahina Haddad ◽  
Ourdia Haddad ◽  
Salima Aggoun ◽  
Salah Kaci
Keyword(s):  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Concrete Aggregate ◽  
Saturation State ◽  
Pore Connectivity ◽  
Accessible Porosity

In this work, an ultrasonic technique was developed to study the porosity and pore connectivity of recycled aggregate concretes (RACs) and to elucidate the correlations between the ultrasonic pulse velocity (UPV), recycled concrete aggregate (RCA) content, and water-accessible porosity of the resulting concrete. To estimate the changes in the degree of connectivity of the concrete pores with the amount of RCA substituted, the concrete specimens were examined at different saturation levels. The correlations between the amounts of RCA used, the UPV, and the saturation state could be determined. It was observed that the pore connectivity of the concretes increased with the amount of RCA substituted, which, in turn, increased their open porosity. These findings may facilitate the use of UPV for the estimation of open porosities of RACs at different saturation levels.

scholarly journals Enhancing Sustainable Concrete Properties by Green Vegetable Substance

2018 ◽  
Vol 7 (4.37) ◽  
pp. 219
Author(s):  
Zainab Hasan Abdulabbas ◽  
Marwa Asad Salih ◽  
Ali Talib Jasim
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Soft Drink ◽  
Gum Arabic ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Waste Materials ◽  
Concrete Properties ◽  
Concrete Production

From several points of view, disposal of waste materials in an environment is respected to be a significant problem because of its very low biodegradability and existence in huge quantities. Waste of plastic and metal bottles caps, cans of juices and soft drink, and tires rubber being among the most pronounced. This study was conducted to evaluate the efficiency of reusing these waste materials in concrete production and solve the segregation problem. As segregation increases in concrete involving these waste materials due to lighter weight of them relative to nature aggregate, therefore, attention was intensive on using natural product (Gum Arabic) that is an environmentally friendly chemical material for improving concrete properties. The conducted tests include; compressive strength, flexural strength, splitting tensile strength, density, water absorption, and ultrasonic pulse velocity. The results showed that replacing the volume of coarse aggregate by 25% compacted bottles caps and pull-tab of cans, 20% the plastic bottle caps, and 25% tires rubber shreds used decreased the mechanical properties of concrete to some extent less than reference mix and they were enhanced by employing Gum Arabic. In addition, the employment of Gum Arabic as liquid in concrete mixes developed the mechanical properties of concrete, reduced segregation, however raised the water absorption percent and declined the density of concrete.  

Ultrasonic Testing of Lightweight Fine Aggregate Concrete in Time and Frequency Domains

2013 ◽  
Vol 357-360 ◽  
pp. 655-658
Author(s):  
Jee Sang Kim ◽  
Kyung Suk Yoo
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Ultrasonic Pulse Velocity ◽  
Peak Frequency ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Future Performance ◽  
Significant Difference

Non-destructive techniques (NDT) have been used to assess the condition of existing concrete structures, to predict future performance, and to monitor the conditions of repaired systems and so on. One of the widely known NDT is the ultrasonic pulse velocity (USPV) method, which determines the travel time of the ultrasonic pulse through the tested material. Most studies were focused on the results expressed in time domain. However, the signal of ultrasonic pulse in time domain can be transformed into frequency domain, through Fast Fourier Transform (FFT). This paper shows a comparison of changes in the pulse velocity and frequency domain signals of concrete for various load histories using lightweight fine aggregates. The results demonstrate that the signals in frequency domain of ultrasonic pulse of lightweight fine aggregate concrete does not show any significant difference comparing with those of normal concrete. The reduction trend of peak frequency was found to be more influenced by the stress levels rather than the ultrasonic pulse velocity.

scholarly journals Geochemistry, Mineralogy and Textural Properties of the Lower Globigerina Limestone Used in the Built Heritage

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 740
Author(s):  
Lino Bianco
Keyword(s):  
Textural Properties ◽  
Clay Content ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Insoluble Residue ◽  
Neolithic Period ◽  
The Matrix ◽  
Mechanical Bonding ◽  
Insight Into

The Lower Globigerina Limestone Member, the oldest member of the Globigerina Limestone Formation, outcrops over most of the Maltese archipelago, notably Malta. It has provided the islands’ main building material since the Neolithic period. This paper makes available a corpus of findings relating to the geochemistry, mineralogy and textural properties of this limestone—mostly unpublished and undertaken nearly three decades ago—which provide a useful source to understand its behavior. Bulk chemistry and mineralogy showed that non-carbonate and clay content is higher in limestone of inferior quality. Textural analyses gave insight into the fabric of the matrix, including inter- and intra-particle porosity. These analyses were supplemented by an array of petrophysical tests, including color (a parameter which has a correlation with density and Fe2O3 content), ultrasonic pulse velocity and compressive strength. The findings not only give insight into the composition of the limestone, using insoluble residue content of ≥5% as the threshold of inferior quality lithotype, but provided an insight into the physico-mechanical bonding present, a characteristic which has a bearing on the deterioration of this limestone.

scholarly journals Eco-Friendly Chopped Tire Rubber as Reinforcements in Fly Ash Geopolymer Concrete

2020 ◽  
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Industrial Wastes ◽  
Fine Aggregate ◽  
Geopolymer Concrete ◽  
Tire Rubber ◽  
Naoh Solution

<p>One of the major challenges faced by researchers is to recycle industrial wastes in a manner that reduces their environmental impact in nature. An experimental study was carried out to determine the suitability of using chopped tire rubber as reinforcements in green and sustainable geopolymer concrete, with the purpose of using them as nonstructural products. The geopolymer mixture was made by mixing of fly ash powder, fine aggregate, and Superplasticizer in Na2SiO3/NaOH solution. Mixtures were divided into four different groups, with constant water to fly ash ratio of 0.12 and alkaline dosage of 45% by weight of fly ash, based on the recycled chopped tire rubber (CTR) content: 0, 10, 20, and 30% by volume of fine aggregate with two maximum sizes (2 and 4mm). Hardened properties of resulted geopolymer like compressive strength, density; and ultrasonic pulse velocity were examined at 28d. Besides that, X-Ray diffractometer and Scanning Electron Microscope were used in order to observe the microstructure of the resulted geopolymer concrete. In view of the consequences for this study, it is preferable to replace no more than 10% of fine aggregate in geopolymer concrete by CTR. In addition, according to SEM photographs, increasing the CTR content more voids will be pronounced and thus, decreasing the mechanical performance.</p>

scholarly journals PROPERTIES OF CONCRETE CONTAINING BLENDED CEMENT AND LIGHTWEIGHT ARTIFICIAL AGGREGATE

2020 ◽  
Vol 32 (2) ◽  
Author(s):  
Chandra Junedy Tanaka ◽  
Abdul Rahman Mohd. Sam ◽  
Norhasanah Abdul Shukor Lim ◽  
Abdullah Zawawi Awang ◽  
Norhaliza Hamzah ◽  
...  
Keyword(s):  
Blended Cement ◽  
Free Water ◽  
Ultrasonic Pulse Velocity ◽  
High Water ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Hardened Concrete ◽  
Main Concern ◽  
Positive Effects ◽  
Concrete Properties

The limitation of natural resources and the increase in industrial waste materials have been being the main concern in many developing countries. Therefore, many studies have been conducted to investigate the feasibility of industrial by-products to be used as artificial aggregate in concrete manufacturing. This study examined the influences of using artificial materials as aggregate replacement of natural aggregate and active pozzolana cement as a binder in concrete. Numbers of tests were performed to investigate the fresh and hardened concrete properties in terms of workability, density, expansion and shrinkage, ultrasonic pulse velocity, flexural strength, compressive strength and mode of failure. The specimens consist of cube and prism were prepared and tested after 3, 7 and 28 days of water curing and air curing. Results of concrete with artificial aggregates recorded lower workability due to the high water absorption, lower density of concrete, lower drying shrinkage due to the reduced free water content and lower pulse velocity in concrete. However, the compressive and flexural strengths were improved by 10% and 38% as of normal concrete, respectively. Therefore, the results obtained from this study indicated that the artificial aggregates and pozzolan cement used have positive effects on concrete properties.

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