scholarly journals The Relationship Between the Concrete Strength Values of Curing Specimens Using Microwave and Standard Methods

2021 ◽  
Author(s):  
Zhiyong Tian ◽  
Yuxuan Yang ◽  
Hongtao Peng ◽  
Jiahui Huang ◽  
Yihua Zhou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Construction Material ◽  
Concrete Strength ◽  
Quick Method ◽  
Standard Methods ◽  
Microwave Curing ◽  
Compressive Performance ◽  
Curing Methods ◽  
Compressive Strength Of Concrete ◽  
The Relationship

As the most widely used construction material, concrete has the characteristics of good compressive performance. The compressive strength of concrete is the most important performance index. However, the compressive strength of concrete measured is generally based on the standard curing period for 28 d. Its period for detection is long. Therefore, it is necessary to study a fast and effective detection method. This paper mainly introduces the experimental method of microwave curing concrete and the relationship between concrete strength values of curing specimens using microwave and standard methods. The experimental results show that concrete specimens exposed to accelerated curing condition under microwave irradiation can increase the strength quickly within a shorter time period depending upon the procedure used in this work. By analysing experimental data, a model of concrete strength at age of 28 d using microwave curing and standard curing methods is established, which can early estimate compressive strength of concrete and provide a quick method for measuring the strength in the field.

The Study of BP Neural Network in Predicting Concrete Strength

2011 ◽  
Vol 243-249 ◽  
pp. 6169-6173
Author(s):  
Zhao Ming
Keyword(s):  
Neural Network ◽  
Mechanical Properties ◽  
Compressive Strength ◽  
Bp Neural Network ◽  
Construction Material ◽  
Concrete Strength ◽  
Main Criterion ◽  
The Past ◽  
Compressive Strength Of Concrete ◽  
Test Result

Concrete is a mainly and commonly good combined construction material, and is consisted of many well-defined components, so mechanical properties of concrete are very complex. the compressive strength of the concrete is a main criterion in producing concrete, but the test on it is complicated because test components of concrete must be kept in the special condition an tested after 28 days. To simplify the procedures and obtain a reasonable data, the paper presents a method using the system of BP neural network predicting the strength of concrete. the system is trained and tested by using many data of strength of concrete in the past ,the test result shows that the value of the strength of concrete predicted is approximate to the experimental value, and the method presented is very efficient and reasonable in predicting the compressive strength of concrete .

scholarly journals EN 206 Conformity Testing for Concrete Strength in Compression

2016 ◽  
Vol 77 (2) ◽  
Author(s):  
Daneti Saradhi Babu ◽  
Li Wei ◽  
Tam Chat Tim
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Concrete Structures ◽  
Strength Level ◽  
Test Results ◽  
Concrete Construction ◽  
The Mean ◽  
Compressive Strength Of Concrete ◽  
Strength In Compression ◽  
The Relationship

The design of concrete structures in accordance with EN 1992-1-1 adopts the characteristic cylinder compressive strength inits equations. EN 206 provides for conformity testing for concrete strength in compression using 150mm diameter by 300mm length cylinders or 150mm cubes only. The complementary standard to EN 206 in UK, BS 8500 (SS 544 in Singapore, MS 523 in Malaysia) has added provisions (clause 12.2) for the use of 100mm cubes for conformity testing. The conformity criteria for 100mm cube specimens are to be the same as those for 150mm cubes. A series of tests based on 3 selected levels of compressive strength has been conducted to examine the relationship between these 3 types of test specimens for compressive strength of concrete. For each strength level, 100 batches of concrete were produced over a period of several months. The test results are presented with analysis based on the mean of 3 numbers for each type of test specimens prepared from the same batch at each time of preparation. The results of this study for the 3 strength levels support the relationship between standard cylinder compressive strength and standard cube compressive strength in EN 206. In addition, results also support the recommendation that standard 100mm cube compressive strength is equivalent to that of standard 150mm cube compressive strength in BS 8500. The use of the small size cubes and certiication of designed concrete promote sustainability in concrete construction.

scholarly journals Study of Concrete Strength and Pore Structure Model Based on Grey Relation Entropy

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 432
Author(s):  
Min Zhang ◽  
Xianhua Yao ◽  
Junfeng Guan ◽  
Lielie Li ◽  
Juan Wang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Pore Structure ◽  
Pore Size ◽  
Concrete Strength ◽  
Sensitivity Coefficient ◽  
Structure Model ◽  
Proposed Model ◽  
Compressive Strength Of Concrete ◽  
The Relationship ◽  
Grey Relation

The Grey Relation Entropy (GRE) theory is used to analyze the sensitive pore size that affects the compressive strength of concrete. The relationship between the strength and pore structure is revised based on the sensitivity coefficient. The revised model is used to calculate the compressive strength of concrete. In order to verify the validity of the proposed model, the calculated results are compared with experimental ones, showing satisfactory agreement with a larger correlation than existing methods.

scholarly journals Studi Kuat Tekan Beton Speedcrete Dengan Zat Additive Naphthalene Berdasarkan Variasi Umur

2019 ◽  
Vol 14 (2) ◽  
Author(s):  
Syifa Fauziah ◽  
Anisah Anisah ◽  
Sittati Musalamah
Keyword(s):  
Compressive Strength ◽  
Test Object ◽  
Treatment Process ◽  
Concrete Strength ◽  
Test Machine ◽  
Water Age ◽  
Normal Concrete ◽  
Compressive Strength Of Concrete ◽  
Normal Strength ◽  
Additive Materials

This research aims to determine the maximum compressive strength value of concrete speedcrete using naphthalene additive additive at each test age and compare with normal concrete 28 days. This research used cylindrical test object with diameter 15 cm and height 30 cm. Speedcrete concrete does not undergo the treatment process while the normal concrete test object through the treatment process. Testing compressive strength of concrete speedcrete using Crushing Test Machine tool. In this research the compressive strength was produced by using superplasticizer type naphthalene and compared with normal concrete without using additive. The target quality plan is fc '35 MPa with the use of additive dose of 1.7% of the weight of cement. The results of this research showed an increase in the value of compressive strength of concrete speedcrete with aadditive materials added naphthalene increased with increasing age of concrete. The results showed that the compressive strength of concrete speedcrete with naphthalene additive materials of 12 hours, 18 hours, 28 hours and 48 hours was 0.5 MPa, 17,81 MPa, 31,14 MPa and 45,77 MPa. Normal strength concrete strength with the addition of 20% water age 28 days that is equal to 54.76 MPa.

scholarly journals Data on mixing and curing methods effects on the compressive strength of concrete

Data in Brief ◽  
2018 ◽  
Vol 18 ◽  
pp. 877-881
Author(s):  
Ignatius O. Omuh ◽  
Timothy O. Mosaku ◽  
Opeyemi Joshua ◽  
Rapheal A. Ojelabi ◽  
Lekan M. Amusan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Curing Methods ◽  
Compressive Strength Of Concrete

On Effects of Fly Ash as a Partial Replacement of Cement on Concrete Strength

2012 ◽  
Vol 204-208 ◽  
pp. 3970-3973
Author(s):  
Reagan J. Case ◽  
Kai Duan ◽  
Thuraichamy G. Suntharavadivel
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Concrete Strength ◽  
Cementitious Materials ◽  
Partial Replacement ◽  
Replacement Ratio ◽  
Interface Reactions ◽  
Compressive Strength Of Concrete ◽  
Interface Bonding Strength ◽  
Large Research

As a part of a large research program aiming at the cementitious materials containing recycled materials at Central Queensland University – Australia, the current paper presents the preliminary results of a study on the effects of fly ash, which is used to replace cement in concrete, on the concrete compressive strength. For this purpose, systematic experiments have been carried out to investigate the influences of fly ash ratio and age. The compressive strength of concrete specimens with replacement ratios of 15%, 30% and 45%, and aged 7 and 28 days are measured and are compared with those of the concrete specimens without fly ash at the same ages. The results demonstrate that the strength of fly ash containing concrete improves more slowly but more strongly with aging, than their fly ash free counterparts, and an optimum fly ash replacement ratio exists where the maximum compressive strength of fly ash containing concrete can be achieved, and the maximum strength for the specimens aged 28 days and above is higher that of fly ash free concrete. Furthermore, the observation strength behaviours are analysed and discussed in terms of the influences of fly ash on interface reactions and interface bonding strength.

scholarly journals Effect of basalt aggregates and plasticizer on the compressive strength of concrete

2015 ◽  
Vol 4 (4) ◽  
pp. 520 ◽  
Author(s):  
Mohammad Al-Rawashdeh ◽  
Ashraf Shaqadan
Keyword(s):  
Compressive Strength ◽  
Laboratory Investigation ◽  
Concrete Strength ◽  
Experimental Program ◽  
Sieve Analysis ◽  
Curing Time ◽  
Compressive Test ◽  
Slump Test ◽  
Compressive Strength Of Concrete

The purpose of this research is to investigate the feasibility of using basalt aggregates and plasticizers in concrete mixes. An elaborate experimental program that included a variation of plasticizer and basalt in concrete mixes. The laboratory investigation included measurements of sieve analysis, compressive strength, and slump test. The compressive test was evaluated at 7, 14, 28 days of curing time. The results show significant improvement in concrete strength up to 2% of additive plasticizer after that concrete strength was reduced.

scholarly journals Estimation of In-situ concrete strength using drilling resistance

2019 ◽  
Vol 289 ◽  
pp. 06001
Author(s):  
Serkan Karatosun ◽  
Muhammet Asan ◽  
Oguz Gunes
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Condition Assessment ◽  
Assessment Practice ◽  
Destructive Testing ◽  
Seismic Safety ◽  
Concrete Mixtures ◽  
Priority Task ◽  
Compressive Strength Of Concrete ◽  
Drilling Resistance

Rapid and reliable condition assessment of reinforced concrete structures in high seismicity regions is a priority task in estimating their seismic safety. Non-destructive testing (NDT) methods may contribute to the condition assessment practice by providing fast and reliable strength estimation while causing minimal or no damage to the structure. Drilling resistance is an NDT method that has been used for mechanical characterization of natural stone and wood by measuring the force response for constant penetration rate and rotational speed. This paper focuses on the relationship between drilling resistance and compressive strength of concrete, including when it is combined with other NDT methods. Concrete cube samples produced using 6 different concrete mixtures were tested. Correlation equations were then obtained using statistical analysis. The results reveal that it may be possible to reliably estimate the compressive strength of concrete using drilling resistance method.

The Effect of the Carbon Fiber on Concrete Compressive Strength

2018 ◽  
Vol 1145 ◽  
pp. 106-111
Author(s):  
De Jia Liu ◽  
Mei Jun Chen ◽  
Li Xue ◽  
Fan He ◽  
Jian Hu
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Construction Material ◽  
Rapid Development ◽  
Great Influence ◽  
Engineering Application ◽  
Fiber Reinforced Concrete ◽  
Engineering Practice ◽  
Curing Time ◽  
Compressive Strength Of Concrete

With the rapid development of construction, the high quality of the construction material is required. Mixing carbon fiber in concrete attracts more and more attention as it can reinforce concrete. However, the science research and engineering application of carbon fiber reinforced concrete is relatively few. In this paper, the effects of different mixing amount of carbon fiber and the sand ratio in concrete and the curing time of concrete and relationships between these factors were investigated. Proper carbon fiber and sand ratio can promote the compressive strength of concrete and it has a good resistance to cracking. The compressive strength of concrete with different mixing amounts of carbon fiber peaks when the sand ratio was 31% and the compressive strength was better when the carbon fiber mixing amount was 0.2% and 1% than any other ratios after 28 days. When the sand ratio was 31%, the compressive strength of carbon fiber mixing amount increased with the increase of curing time and it reached the top when the carbon fiber ratio was 0.8%. The mixing amount of carbon fiber also had a great influence on the early compressive strength to some extent. We anticipate that the research can offer certain reference for engineering practice.

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