Experimental investigation on bacterial concrete strength with Bacillus subtilis and crushed stone dust aggregate based on ultrasonic pulse velocity

2020 ◽  
Vol 27 ◽  
pp. 1111-1117
Author(s):  
C. Venkata Siva Rama Prasad ◽  
T.V.S. Vara Lakshmi
Keyword(s):  
Experimental Investigation ◽  
Bacillus Subtilis ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Crushed Stone ◽  
Stone Dust ◽  
Bacterial Concrete

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 Utilization of Bacillus Subtilis Bacteria for Improving Mechanical Properties of Concrete

2020 ◽  
Vol 1000 (1000) ◽  
Author(s):  
Sudipto Nath Priyom ◽  
Md. Moinul Islam ◽  
Wahhida Shumi
Keyword(s):  
Bacillus Subtilis ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Maintenance Cost ◽  
Concrete Technology ◽  
Conventional Concrete ◽  
Culture Density ◽  
Microbial Groups ◽  
Bacterial Concrete

Utilization of concrete as a building material is well-known worldwide and increasing continuously due to its sustainability, low maintenance cost, durability performance, etc. Ingredients of concrete, its constructional methodology, exposure conditions are moderating and improving day by day. However, this study covers a laboratory investigation of Bacterial Concrete. The bacterial concrete technology is based on the application of the mineral producing microbes. Some microbes like Bacillus subtilis which have the properties of bio-calcification can precipitate CaCO3 effectively inside concrete structures. This CaCO3 precipitation can fill the pores and therefore, the cracks internally and finally make the structure more compact. In this experimental study, Nutrient Broth (NB) media was employed for the growth and spore formation of Bacillus subtilis bacteria. Four different bacterial culture densities (0.107, 0.2, 0.637, and 1.221) were estimated at OD600 and directly added to concrete matrix maintaining previously fixed water to culture ratio (0.5:0.5). 100 mm cubical concrete specimens were cast, subjected to compressive and tensile strength tests for different curing ages and finally compared with Conventional Concrete (OD600=0). Significant increase in mechanical strengths was observed due to addition of Bacillus subtilis bacteria in concretes which have the culture density of 0.637. Soon cylindrical concrete specimens of 100 mm diameter and 200 mm height were prepared for Ultrasonic Pulse Velocity (UPV) analysis. The test results obtained from UPV analysis reveal that specimens prepared with culture density of 0.637 show higher pulse velocity than other microbial groups. Afterwards, this paper proposes a UPV vs. compressive strength relationship curve for different strengths of concrete.

PENGKAJIAN KEKUATAN BETON STRUKTUR JEMBATAN PASCA KEBAKARAN

2013 ◽  
Vol 12 (3) ◽  
Author(s):  
Sudarmadi Sudarmadi
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Strength Assessment ◽  
Concrete Testing

In this paper a case study about concrete strength assessment of bridge structure experiencing fire is discussed. Assessment methods include activities of visual inspection, concrete testing by Hammer Test, Ultrasonic Pulse Velocity Test, and Core Test. Then, test results are compared with the requirement of RSNI T-12-2004. Test results show that surface concrete at the location of fire deteriorates so that its quality is decreased into the category of Very Poor with ultrasonic pulse velocity ranges between 1,14 – 1,74 km/s. From test results also it can be known that concrete compressive strength of inner part of bridge pier ranges about 267 – 274 kg/cm2 and concrete compressive strength of beam and plate experiencing fire directly is about 173 kg/cm2 and 159 kg/cm2. It can be concluded that surface concrete strength at the location of fire does not meet the requirement of RSNI T-12-2004. So, repair on surface concrete of pier, beam, and plate at the location of fire is required.

PROPERTIES OF MORTAR BLOCKS WITH WASTE CONCRETE ASH (WCA) AS A CEMENT REPLACEMENT

2015 ◽  
Vol 75 (5) ◽  
Author(s):  
N. F. Abas ◽  
M. A. Karim
Keyword(s):  
Experimental Investigation ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Strength Test ◽  
Flexural Test ◽  
Cement Replacement ◽  
Waste Concrete ◽  
Compressive Strength Test ◽  
Water Absorption Test

This paper presents the experimental investigation into the properties of mortar blocks containing waste concrete ash (WCA) as a cement replacement. In the experimental investigation, the properties of the mortar blocks were assessed through 3 different type of mixing. The replacement of waste concrete ash (WCA) had been divided into percentage which 0% (control), 5 %, 10 % and 15%. This different type of mixing had been tested with different duration with 7 day, 14 day and 28 day. Three cube specimens and three blocks specimens were prepared for each test. The total specimen that were prepared and tested are 36 cubes and 36 blocks. Workability test (slump test), density test, ultrasonic pulse velocity test, compressive strength test, flexural test and water absorption test were carried out. The experimental results of this study indicate that to observe the inclusion of waste concrete ash (WCA) in mortar blocks enhances the properties of mortar blocks in aspect of replacement of cement. 

scholarly journals Factors influencing ultrasonic pulse velocity in concrete

2020 ◽  
Vol 13 (2) ◽  
pp. 222-247 ◽  
Author(s):  
J. P. GODINHO ◽  
T. F. DE SOUZA JÚNIOR ◽  
M. H. F. MEDEIROS ◽  
M. S. A SILVA
Keyword(s):  
Portland Cement ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Hydrated Calcium Silicate ◽  
Degree Of Hydration ◽  
Mix Proportion ◽  
Non Destructive ◽  
Cylindrical Test

Abstract The hydration process of Portland cement triggers reactions of stabilization of minerals from the contact of the clinker with water, which is the Hydrated Calcium Silicate (C-S-H), the Etringite (3CaO.Al2O3.3CaSO4.32H2O) and the Portlandite (Ca(OH)2). In order to understand the effects of the evolution of hydration in cement, it is possible to apply non-destructive tests. In this context, the objective of this work is to evaluate the influence of the type of cement, the curing age, of the format and humidity of the test specimens of concrete in the ultrasonic pulse velocity (UPV). In order to do that, 36 cylindrical test specimens (10 x 20 cm) and 9 cubic ones with 25 cm of edges, with mix proportion of 1:2,7:3,2 (cement/sand/gravel), water/cement ratio of 0.58 and three types of Portland cement (CP II-Z-32, CP IV-32 RS and CP V-ARI) were molded. With data obtained it was possible to correlate the increase of concrete strength along time (at ages of 7, 14, 28, 70 and 91 days) with the increase of the ultrasonic pulse velocity. Besides, it was possible to prove the direct influence of the concrete moisture and of the degree of hydration in the UPV. The shape of the test specimen generally had no influence on the results, except in the case of cement CP V ARI.

scholarly journals Evaluating Concrete Quality using Nondestructive In-situ Testing Methods

2019 ◽  
pp. 22-40
Author(s):  
Khalid Abdel Naser Abdel Rahim
Keyword(s):  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Initial Surface ◽  
In Situ Testing ◽  
Surface Absorption ◽  
Concrete Quality

This manuscript investigate the quality of concrete using non-destructive in-situ testing.The in-situ testing is a process by which different test are carried out such as rebound hammer, ultrasonic pulse veloc-ity, initial surface absorption test and fig air, to determine thein-situ strength, durability and deterioration, air permeability, concrete quality control andperformance. Additionally, the quality of concrete was researched using test methods with experimental results. Moreover, this research has found that (1) the increase in w/c ra-tioleads to a decrease in compressive strength and ultrasonic pulse velocity. Thus, lower w/cratio gives a bet-ter concrete strength in terms of quality, (2) the quicker the ultrasonic pulse travels through concrete indicates that the concrete is denser, therefore, better quality, (3) the lower initial surface absorption value indicates a better concrete with respect to porosity and (4) the w/c ratio plays an important role in the strength and per-meability of concrete.

scholarly journals Combined Use of Ultrasonic Pulse Velocity and Rebound Hammer for Structural Health Monitoring of Reinforced Concrete Structures

2019 ◽  
Author(s):  
Ahmed Lasisi ◽  
Obanishola Sadiq ◽  
Ibrahim Balogun
Keyword(s):  
Concrete Strength ◽  
Linear Regression Analysis ◽  
Concrete Structures ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Second Phase ◽  
Rebound Hammer ◽  
Combined Use ◽  
Non Destructive

This work investigates the use of Non-destructive tests as a tool for monitoring the structural performance of concrete structures. The investigation encompassed four phases; the first of which involved the use of destructive and non-destructive mechanisms to assess concrete strength on cube specimens. The second phase research focused on site assessment for a twin engineering theatre located at the Faculty of Engineering, University of Lagos using rebound hammer and ultrasonic pulse velocity tester. The third phase was the use of linear regression analysis model with MATLAB to establish a relationship between calibrated strength as well as ultrasonic pulse velocities with their corresponding compressive strength values on cubes and values obtained from existing structures. Results show that the root-mean squared-R2 values for rebound hammer ranged between 0.275 and 0.742 while ultrasonic pulse velocity R2 values were in the range of 0.649 and 0.952 for air curing and water curing systems respectively. It initially appeared that the Ultrasonic pulse velocity was more suitable for predicting concrete strength than rebound hammer but further investigations showed that the latter was adequate for early age concrete while the former was more suited for aging concrete. Hence, a combined use is recommended in this work.

Assessment of Compressive Strength for RC Building Using the Non-Destructive Test and the SonReb Method: A Case Study

2021 ◽  
Vol 1021 ◽  
pp. 45-54
Author(s):  
Mohammed Al-Helfi ◽  
Ali Allami
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Method ◽  
Technical Institute ◽  
Existing Building ◽  
Destructive Test ◽  
Non Destructive

Non-Destructive methods have greater advantage in assessing the homogeneity, compressive strength, corrosion of rebars in concrete etc. of damaged structures. The aim of the present study is to assess the existing building, which is 41 year old, in the Technical Institute of Amara affiliated with the Southern Technical University, Maysan, Iraq. The research focus on the assessment of the concrete strength and the inspection of the damages in the building. Besides the visual inspection, the ultrasonic pulse velocity and schmidt hammer were used as a non-destructive test method for testing of 30 columns and 15 beams for a building consisting of three floors. The concrete compressive strength was estimated by using SonReb method. The equations proposed by Gasparik, 1984, Di Leo & Pascale, 1994, Arioglu et al., 1996, Cristofaro et al. (EXP), 2020 and Cristofaro et al (PW), 2020 were used for assessment the compressive strength of oncrete. The non-destructive test results indicated that the average strength of the structural elements greater than the design compressive strength of the tested elements. Therefore, the building can be considered structurally is safe.

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