Data Science and Machine Learning Technique for Predicting Electrical Resistivity in Recycled Concrete with Nopal as Addition

2021 ◽  
Vol 40 ◽  
pp. 43-62
Author(s):  
José Alberto Guzmán-Torres ◽  
Arturo Zalapa-Damian ◽  
Francisco Javier Domínguez-Mota ◽  
Elia Mercedes Alonso-Guzmán
Keyword(s):  
Electrical Resistivity ◽  
Data Science ◽  
Numerical Models ◽  
Input Parameter ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Opuntia Ficus Indica ◽  
Coarse Aggregates ◽  
Learning Technique ◽  
Non Destructive

Nowadays, the solid residues of concrete are considered waste, and this have been transformed into an environmental problem. This study analyzes the use of aggregates that comes from the concrete demolition process in order to create recycled concrete. The use of this material reduces costs and mitigates pollution. The present research describes the comparison of concrete blends using Opuntia Ficus Indica as an addition and recycled coarse aggregates as a substitution against a control blend. Mechanical and non-destructive tests were performed to evaluate the performance of each mixture. A data science technique was used to generate artificial data to increase the number of data to be evaluated. Numerical models were established to find correlations between all the features that describe the materials. The use of recycled aggregates and the use of the Opuntia Ficus Indica improved the performance in all the tests made to the concrete. Additionally, different models based on regression trees were used to predict with high accuracy the compressive strength in this kind of material just considering the electrical resistivity as an input parameter.

Prediction of the Tensile Strength and Electrical Resistivity of Concrete with Organic Polymer and their Influence on Carbonation Using Data Science and a Machine Learning Technique

2020 ◽  
Vol 862 ◽  
pp. 72-77
Author(s):  
José Alberto Guzmán Torres ◽  
Francisco Javier Domínguez Mota ◽  
Elia Mercedes Alonso-Guzmán ◽  
Wilfrido Martínez-Molina ◽  
José Gerardo Tinoco Ruiz ◽  
...  
Keyword(s):  
Machine Learning ◽  
Tensile Strength ◽  
Electrical Resistivity ◽  
Data Science ◽  
Organic Polymer ◽  
Machine Learning Technique ◽  
Learning Technique ◽  
Improved Performance ◽  
Using Data ◽  
Non Destructive

The inclusion of additions to concrete blends helps to improve performance in certain conditions. The analysis of two concrete blends was performed, a blend with the addition of a natural organic polymer and a control blend to make predictive models and find a correlation. Tree tests were performed: Electrical resistivity (Er) test, Tensile strength (Ft) and Carbonation resistance. One of the most popular non-destructive tests on concrete is , due to the simplicity of measuring readings on concrete elements. It is a non-destructive test that determines the interconnectivity that exists in the concrete cementitious matrix by determining the quality of the concrete. The blend with the addition showed improved performance in all the tests. Data science techniques were used to generate artificial data, the Machine Learning technique (ML) is based on Tree regression (Tr) with satisfactory accuracy to assess the reliability.

scholarly journals Microstructural analysis of concretes manufactured with recycled coarse aggregates pre-soaked using different methods

2020 ◽  
Vol 70 (339) ◽  
pp. 228 ◽  
Author(s):  
Z. Sánchez-Roldán ◽  
I. Valverde-Palacios ◽  
I. Valverde-Espinosa ◽  
M. Martín-Morales
Keyword(s):  
Microstructural Analysis ◽  
Treatment Method ◽  
Absorption Capacity ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Negative Effects ◽  
Optimal Method ◽  
Transition Zones ◽  
Coarse Aggregates

Recycled concrete has a microstructure more complex than natural concrete, as it includes new interfacial transition zones, the quality of which is conditioned by the state of humidity of the aggregates used, which in turn will affect the final properties of the concrete. Bearing in mind the greater absorption capacity of recycled aggregates, it is important to improve its properties by means of a treatment method that is capable of reducing the negative effects that this may produce in the new concrete. Therefore, the influence of the pre-soaking method of recycled aggregates on the formation of the microstructure of concretes manufactured with these aggregates is analysed, to determine which treatment is the most effective for the production of concretes for non-structural use. The results show that the microstructure of the evaluated concretes differs according to the treatment method used, the most optimal method being one that uses aggregates without pre-soaking.

scholarly journals Effect of Mould Size on Compressive Strength of Green Concrete Cubes

2019 ◽  
Vol 5 (5) ◽  
pp. 1181-1188
Author(s):  
Bashir Ahmed Memon ◽  
Mahboob Oad ◽  
Abdul Hafeez Buller ◽  
Sajjad Ahmed Shar ◽  
Abdul Salam Buller ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Input Parameter ◽  
Testing Machine ◽  
Recycled Aggregates ◽  
Load Testing ◽  
Standard Size ◽  
Concrete Aggregates ◽  
Coarse Aggregates ◽  
Increasing Load ◽  
Curing Age

This paper is aimed to evaluate the effect of mould size on compressive strength of concrete cubes made with recyclable concrete aggregates. Natural coarse aggregates were replaced with 50% recycled aggregates from old demolished concrete. Five different mould sizes were used to cast 420 concrete cubes using 1:2:4 mix and 0.55 water/cement ratio. In each size equal number of cubes was cured for 3, 7, 14 and 28-day. After curing, weight of cubes was determined followed by testing for compressive strength in universal load testing machine with gradually increasing load. From the obtained results the strength correction coefficients were computed keeping 28-day cured standard size cubes as control specimens. Also, numerical expression based on regression analysis was developed to predict the compressive strength using weight of cube, area of mould and curing age as input parameter. The numerical equation predicts the compressive strength very well with maximum of 10.86% error with respect to experimental results. 

Structural behavior of recycled aggregates concrete filled steel tubular columns

2017 ◽  
Vol 8 (1) ◽  
pp. 17 ◽  
Author(s):  
Boshra Eltaly ◽  
Ahmed Bembawy ◽  
Nageh Meleka ◽  
Kameel Kandil
Keyword(s):  
Finite Element ◽  
Steel Tube ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Experimental Program ◽  
Element Analysis ◽  
Finite Element Program ◽  
Tubular Columns ◽  
Coarse Aggregates ◽  
Element Program

This paper presents an experimental and numerical investigation to determine the behavior of steel tubular columns filled with recycled aggregates concrete up to failure under constant axial compression loads. The experimental program included two steel tube columns, four recycled concrete columns and eight composite columns filled with different types of recycled coarse aggregates (granite and ceramic). Different percentages of recycled coarse aggregates: 0, 25 and 50 of the percentage of the coarse aggregates (dolomite) were used. The results of the numerical model that was employed by the finite element program, ANSYS, were compared with the experimental results. The results of the experimental study and the finite element analysis were compared with the design equations using different national building codes: AISC1999, AISC2005 and EC4. The results indicated that the recycled aggregates concrete infill columns have slightly lower but comparable ultimate capacities compared with the specimens filled with normal concrete.

New Concrete with Recycled Aggregates from Leftover Concrete

2015 ◽  
Vol 754-755 ◽  
pp. 389-394
Author(s):  
Ofelia Corbu ◽  
Attila Puskás ◽  
Andrei Victor Sandu ◽  
Adrian M. Ioani ◽  
Kamarudin Hussin ◽  
...  
Keyword(s):  
Concrete Strength ◽  
Ecological Impact ◽  
Experimental Tests ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Concrete Aggregate ◽  
River Sand ◽  
Coarse Aggregates ◽  
Concrete Type ◽  
Natural Aggregates

We live in an era where people should be more aware of pollution and its consequences. The present paper reveals a way protecting the environment while producing high quality concrete. What make this type of concrete environmentally friendly are the recycled aggregates in the concrete composition amongst with eliminating the ecological impact by saving large amounts of natural aggregates resources. Recycling concrete comes with many other advantages that lead to waste reduction, economy in waste transportation and storage taxes, which are becoming increasingly expensive. This research is based on mix design and experimental tests carried out on C20/25 strength class concrete with uncontaminated leftover concrete aggregates (LCAgg). It reveals favorable results in order to militate for recycled concrete aggregate uses in regular concrete strength classes respectively for common structural elements, mainly for slabs. River sand (0/4 mm) and coarse aggregates (4/8 mm and 8/16 mm): natural sources or recycled concrete type-alternatively used in several mixes-were utilized in concrete mixes.

scholarly journals Influence of the moisture content on the dynamic modulus of elasticity of concrete made with recycled aggregate

2019 ◽  
Vol 19 (2) ◽  
pp. 79-89
Author(s):  
Claudio de Souza Kazmierczak ◽  
Joana Kirchner Benetti Boaro ◽  
Monique Palavro Lunardi ◽  
Marlova Piva Kulakowski ◽  
Mauricio Mancio
Keyword(s):  
Moisture Content ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Coarse Aggregate ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Coarse Aggregates ◽  
Codes Of Practice ◽  
Dynamic Modulus Of Elasticity

Abstract The elastic behavior of the concrete is estimated from its strength or determined by static or dynamic tests. However, because the codes of practice do not standardize the internal moisture content of the concrete and disregard the use of recycled aggregates when proposing equations for the estimation of the modulus of elasticity, discrepancies between the values measured and estimated are frequent. The influence of the moisture content of concrete containing basaltic coarse aggregates and coarse recycled concrete aggregate in the dynamic modulus of elasticity is discussed in this paper. A basalt coarse aggregate and two recycled coarse aggregates where used. For each type of coarse aggregate, concrete with compression strength between 25 MPa and 55 MPa were produced. The dynamic modulus of elasticity of the saturated samples were determined and range from 26 GPa to 46 GPa. There is a significant difference in the value of the dynamic modulus of elasticity for dry concrete versus saturated concrete, also influenced by the type of aggregate. Estimations of the modulus of elasticity from the compressive strength equations proposed by the codes of practice must be improved considering its characteristics.

scholarly journals Effect of Mortar Reduction in Recycled Aggregates Used in Concrete

2017 ◽  
Vol 11 (1) ◽  
pp. 363-370 ◽  
Author(s):  
Viviana Letelier ◽  
Ester Tarela ◽  
Pedro Muñoz
Keyword(s):  
Environmental Concern ◽  
Recycled Concrete ◽  
Raw Material ◽  
Recycled Aggregates ◽  
Structural Concrete ◽  
Mechanical Abrasion ◽  
Coarse Aggregates ◽  
Global Environmental ◽  
Material Reuse ◽  
Global Environmental Concern

Background:Following a global environmental concern, concrete manufactured with recycled materials has been widely studied. The reuse of concrete as raw material can reduce the amount of debris and the amount of natural resources needed minimizing the environmental impact.Objective:One of the fundamental issues when using recycled aggregates is the mortar that remains adhered to their surfaces. The effect of this adhered mortar on aggregates, obtained from pavement demolition debris, used in recycled concrete is studied.Method:A mechanical abrasion process is used to reduce the amount of mortar in different degrees from the recycled aggregates that will be used to replace a 40 % of natural coarse aggregates in structural concrete. The mechanical behavior is studied through the compressive and flexural strength of the material and compared with the values obtained for a control concrete, with no recycled aggregates.Results:The abrasion process is proven to be effective eliminating the adhered mortar to the aggregates and the results show that a medium abrasion level, around 200rev, improves significantly the mechanical properties of the recycled concrete, increasing its compressive strength.Conclusion:The percentage of recycled aggregates used in structural concrete can be increased if these are treated with simple mechanical abrasion. The residuals of the eliminated mortar can be also reused as cement replacement, maximizing the material reuse.

scholarly journals Experimental Inspection on Shear Capacity in RCC Beams with Partial Replacement of Recycled Coarse Aggregates

2020 ◽  
Vol 9 (2) ◽  
pp. 321-326
Keyword(s):  
Compressive Strength ◽  
Load Ratio ◽  
Shear Capacity ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Partial Replacement ◽  
Age Group ◽  
Shear Span ◽  
Coarse Aggregates ◽  
The Relationship

Demolition waste increasing day by day. The old damaged building materials can be used in present buildings or other construction works. Especially the recycled aggregates are useful to the concrete structures. The experimental studies on the use of recycled coarse aggregate has been going on for many countries. This publication focuses on the relationship between the shear capacity and the flexural cracking load of reinforced recycled concrete beams with stirrups, this experimental Inspection with partial replacement of natural coarse aggregates (NAC) with recycled coarse aggregates (RAC) at different ages as 10, 20 and 30 years in various proportions as 20 per cent, 30 per cent, 40 per cent. For this, M30 grade of concrete is consider. Curing of specimens were done for 7 day and 28 days to conclude the maximum strengths. The obtained results of concrete with partial replacement of recycled aggregates of 10,20and 30 years age group conclude maximum compressive strength of 35.84 N/mm2 at 40% replacement of NCA with RCA of age group (10 years) and 34.12 N/mm2 at 30% replacement of NCA whit RCA of (20 years) age group and 36.14 N/mm2 20% replacement of NCA with RCA of age group (30 years). After the compressive strength, beam specimens were casted for 7day and 28 days. Based on test results of 8 beams, the relationship between the cracking load that causes a beam to crack in the middle of the shear span and the beam's shear capacity is confident. All beams are reinforced in the longitudinal direction only and only tested under two-point loading conditions. The average analytical cracking load ratio is 0.60.the mid-shear span at cracking load (Vcr-a/2) in comparison with the observed shear capacity (Vexp). The analytical cracking load ratio. The analytical cracking’s load was used in this exploration as it is more reliable than the observed cracking load. At mid-span, the shear capacity of most of the beams was shown to be 50%. The average shear capacity ratio to the related test crack load in the center of the shear span 0.43. The analysis showed that cracking loads are strongly related to the shear capacity of the members. This relationship can be used to develop recycled reinforced beam members ' shear design process.

THE SHEAR STRENGTH OF 50 MPA CONCRETE BEAMS MADE USING RECYCLED CONCRETE COARSE AGGREGATES

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Khaldoun Rahal ◽  
Yazzan Alrefaei
Keyword(s):  
Shear Strength ◽  
Cross Section ◽  
Modulus Of Elasticity ◽  
Concrete Beams ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Ultimate Shear Strength ◽  
Coarse Aggregates ◽  
Reinforced Beams ◽  
Testing Region

Five 50 MPa longitudinally reinforced beams were loaded in a four-point testing setup to study their shear behavior. The beams were three meters long, and their cross section was 150 mm by 420 mm. The testing region did not contain stirrups. The beams were shallow, with a span to depth ratio of 3. All beams were similar except for the percentages of replacement of natural coarse aggregates with recycled concrete coarse aggregates, which were 0%, 10%, 20%, 35% and 100%. The results have shown that the replacement of natural coarse aggregates with recycled ones had a negligible effect on the ultimate shear strength. However, the results on the modulus of elasticity showed a reduction of less than 10% in beams with the use of recycled aggregates.

A Study on the Use of Construction Wastes as Coarse Aggregates on High Performance Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 1525-1531
Author(s):  
Chung Ming Ho ◽  
Wei Tsung Tsai
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Mechanical And Thermal Properties ◽  
Loss On Ignition ◽  
Coarse Aggregates ◽  
Flow Test ◽  
Water To Cement Ratio

In recent years, because of rising consciousness on environmental protection and the lacking of construction waste dumping yards, recycling of construction wastes has been promoted extensively. The purpose of this study is to ascertain the effect on properties of the fresh and harden concrete replacing coarse aggregates by construction wastes under ambient and enhanced temperatures exposure. This research mainly concentrates on high performance recycled concrete (HPRC); by adding different amount of superplasticizer into the HPRC and to test and compare its mechanical and thermal properties with general high performance concrete (HPC). Thereafter, tests are carried out determine its compressive strength, residual strength after high temperature and the loss on ignition of the HPRC mixed with two water-to-cement ratios and different replacement proportions of recycled aggregates. Similar tests, such as the slump test and slump flow test, are carried out both on the HPRC and HPC. When the water-to-cement ratio is 0.3 and the amount of superplasticizer added is 1.2%, HPRC has the best performance. The specimens with 100% recycled aggregates were 31% below the control concrete sample in compressive strength at age of 28 days. By the way of adding admixture, the recycled concrete could reach the demand strength of the HPC. The results show that it is feasible to allow a higher replacement percentage of construction wastes for producing concrete products.

Sign in / Sign up

Export Citation Format

Share Document