Prediction on concrete splitting strength from compressive strength of drilling‐core

2021 ◽  
Author(s):  
Su‐hang Yang ◽  
Zhi‐feng Xu ◽  
Jun‐xia Wang
Keyword(s):  
Compressive Strength ◽  
Splitting Strength ◽  
Drilling Core

Research on the Main Mechanical Capability of Steel Fibers Concrete of Deck Pavement

2011 ◽  
Vol 374-377 ◽  
pp. 1619-1622
Author(s):  
Ling Zhang ◽  
Zhi Qiang Shi
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Service Life ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Mechanical Performance ◽  
Volume Ratio ◽  
Steel Fibers ◽  
Fiber Types ◽  
Splitting Strength

In this article, based on a certain actual project, the main physical and mechanical performance including compressive strength, splitting strength, flexural strength and shear strength are studied in detail through the experiments. Different fiber types and volume ratio are chosen in the experiments for the purpose of determining the best quantities and types of steel fiber in concrete to lengthen the service life of deck pavements. It is showed that the research has some referential value for similar projects.

scholarly journals Mechanical Properties of Ultra-High Performance Concrete before and after Exposure to High Temperatures

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 770 ◽  
Author(s):  
How-Ji Chen ◽  
Yi-Lin Yu ◽  
Chao-Wei Tang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Temperatures ◽  
High Performance ◽  
High Performance Concrete ◽  
Silicon Powder ◽  
Supplementary Cementitious Materials ◽  
Ultra High Performance Concrete ◽  
Splitting Strength ◽  
Experimental Group

Compared with ordinary concrete, ultra-high performance concrete (UHPC) has excellent toughness and better impact resistance. Under high temperatures, the microstructure and mechanical properties of UHPC may seriously deteriorate. As such, we first explored the properties of UHPC with a designed 28-day compressive strength of 120 MPa or higher in the fresh mix phase, and measured its hardened mechanical properties at seven days. The test variables included: the type of cementing material and the mixing ratio (silica ash, ultra-fine silicon powder), the type of fiber (steel fiber, polypropylene fiber), and the fiber content (volume percentage). In addition to the UHPC of the experimental group, pure concrete was used as the control group in the experiment; no fiber or supplementary cementitious materials (silica ash, ultra-fine silicon powder) were added to enable comparison and discussion and analysis. Then, the UHPC-1 specimens of the experimental group were selected for further compressive, flexural, and splitting strength tests and SEM observations after exposure to different target temperatures in an electric furnace. The test results show that at room temperature, the 56-day compressive strength of the UHPC-1 mix was 155.8 MPa, which is higher than the >150 MPa general compressive strength requirement for ultra-high-performance concrete. The residual compressive strength, flexural strength, and splitting strength of the UHPC-1 specimen after exposure to 300, 400, and 500 °C did not decrease significantly, and even increased due to the drying effect of heating. However, when the temperature was 600 °C, spalling occurred, so the residual mechanical strength rapidly declined. SEM observations confirmed that polypropylene fibers melted at high temperatures, thereby forming other channels that helped to reduce the internal vapor pressure of the UHPC and maintain a certain residual strength.

Recycling of Stone Cutting Waste In the Construction Sector: A Review

2021 ◽  
Vol 47 (1) ◽  
pp. 56-60
Author(s):  
Kamel Al-Zboon ◽  
Talal Masoud
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Construction Sector ◽  
Replacement Ratio ◽  
Splitting Strength ◽  
Substitution Ratio ◽  
Stone Cutting ◽  
Compressive Strength Of Concrete ◽  
The Cost ◽  
The Impact

Huge amounts of stone cutting waste are generated annually posing a heavy environmental load on nature and resulting in economic challenge to the plants' owners. The conducted researches in this field showed that stone, marble and granite waste could be reused in many applications. This paper aims to investigate the possible application of stone cutting waste in the construction sector. Review process includes investigation of the conducted researches, outcomes of the performed projects, and the impact of this waste on the characteristics of concrete compressive strength, flexural strength, splitting strength, concrete workability, bricks strength, terrazzo tile strength and soil properties. The results revealed that at suitable substitution ratio, this waste can increase the compressive strength of concrete up to 21%, the flexural strength by 33% and splitting strength by 4.3%. In contrast, the compressive strength of bricks decreased by up to 67% at replacement ratio of 100%, and the transverse strength of tiles decreased up to 18% at replacement ratio of 50%. Replacement of soil with stone cutting waste resulted in an improvement in the characteristics of cohesive and sandy soil. Concrete workability decreased significantly with replacement of normal aggregate with stone cutting waste. Such results buttressed the feasibility of reusing this material in the construction sector, which reduces the cost of storage and disposal, and creates a nonconventional income.

scholarly journals The Effect of Mixing Technique and Prolonged Mixing Time on Strength Characteristics of Concrete

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1290
Author(s):  
Karol Urban ◽  
Alena Sicakova
Keyword(s):  
Compressive Strength ◽  
Mixing Time ◽  
Strength Properties ◽  
Recycled Concrete ◽  
Strength Characteristics ◽  
Concrete Aggregate ◽  
Splitting Strength ◽  
Mixing Method ◽  
Tensile Splitting Strength ◽  
The Impact

The experiment aims to test the triple mixing (3M) technique to produce the concrete with recycled concrete aggregate (RCA). Then, the impact prolonged mixing, representing the influence of delivery and discharge time in praxis, is analysed by the change in strength properties. Both the 28-day compressive strength and tensile splitting strength are evaluated in two aspects: the prolonged mixing time (0, 45 and 90 min after initial mixing), and the mixing method (normal and triple). Prolonged mixing time brought both the positive and negative changes in strength characteristics however the worst difference between initial mixing (0′) and 90′ minutes of mixing was only 8.4% for compressive strength and 8.5% for tensile splitting strength.

scholarly journals Study on Mechanical and Frost Resistance Properties of Slag and Macadam Stabilized with Cement and Fly Ash

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7241
Author(s):  
Hongbo Li ◽  
Pengfei Yan ◽  
Juncang Tian ◽  
Hao Sun ◽  
Jianguang Yin
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Frost Resistance ◽  
Unconfined Compressive Strength ◽  
Thermal Power ◽  
Ultrasonic Test ◽  
Replacement Rate ◽  
Large Country ◽  
Splitting Strength ◽  
Strength Tests

China is a large country in terms of coal production and consumption. The fly ash and slag produced by thermal power plants pose a great threat to the environment. To reduce the adverse effects of fly ash and slag on the environment, a mixture of slag and macadam stabilized with cement and fly ash was prepared as pavement base material. Compaction tests, unconfined compressive strength tests, splitting strength tests, frost resistance tests, and ultrasonic tests were performed on the mixture. The results show that with an increase in slag replacement rate, the unconfined compressive strength and splitting strength decreased. However, the adverse influence of the slag replacement rate on unconfined compressive strength and splitting strength of specimens gradually weakened with increasing curing time. The frost resistance of the mixture first increased and then decreased with an increase in the slag replacement rate. When cement content was 5% and the slag replacement rate was 50%, the frost resistance of the mixture was the best. Regression analysis of the ultrasonic test showed that the ultrasonic test can effectively characterize the strength of the mixture and the internal damage degree under freeze–thaw cycles. In conclusion, the slag replacement rate of the mixture is recommended to be ~50%, which has preferable mechanical and frost resistance performance.

scholarly journals Study the effect of vibration mixing on the performances of full replacement recycled aggregate concrete

2021 ◽  
Vol 276 ◽  
pp. 02027
Author(s):  
Taotao Li
Keyword(s):  
Compressive Strength ◽  
Solid Waste ◽  
Building Materials ◽  
Engineering Application ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Carbonation Depth ◽  
Aggregate Concrete ◽  
Natural Aggregate ◽  
Splitting Strength

It is an urgent problem that the construction solid waste is difficult to be treated, and its recycling provides a way for its treatment. The quality of construction solid waste recycled aggregate is lower than that of natural aggregate, which limits its extensive application in building materials. In order to provide a new method for engineering application of recycled aggregate concrete, the influence of vibration mixing on the performances of full replacement recycled aggregate concrete were studied. The performance indexes of recycled aggregate concrete under ordinary mixing and vibration mixing were compared and analyzed. The experimental results show that compared with natural aggregate concrete, the slump of full replacement recycled aggregate concrete decreased by 58.8%, and 7d and 28d compressive strength decreased by 12.9% and 16.1%, and the splitting strength decreased by 30.6% and 20.1%, and the carbonation depth decreased by 91.5%; Compared with natural aggregate concrete using ordinary mixing, the slump of full replacement recycled aggregate concrete using vibration mixing decreased by 50.9%, the 7d and 28d compressive strength decreased by 6.9% and 10.9%, and the splitting strength decreased by 16.9% and 12.4%, and the 28d carbonation depth decreased by 34.9%. The results show that compared with ordinary mixing, vibration mixing can improve the performance of recycled aggregate concrete, which provides a reference for engineering application.

scholarly journals Experimental study on the influence of recycled aggregates on the mechanical properties of concrete

2021 ◽  
Vol 283 ◽  
pp. 01033
Author(s):  
Chuangui Li ◽  
Hongkui Zhao ◽  
Jianfeng Wu ◽  
Xiangang Li ◽  
Ya Zhang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Solid Waste ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Cohesive Force ◽  
Recycled Aggregates ◽  
Replacement Rate ◽  
Aggregate Concrete ◽  
Splitting Strength

Construction solid waste has become an important environmental pollution source in the city, and the treatment and application of construction solid waste has become the focus of attention. Construction waste recycled aggregates have defects such as high water absorption and micro cracks, which affect its extensive application. In order to improve the utilization rate of recycled aggregates, the influence of different replacement rates of recycled aggregates on the mechanical properties of concrete is studied in this paper. The results show that with the increase of replacement rate of recycled aggregates, the 3-day, 7-day and 28-day compressive strength, splitting strength and cohesive force of concrete decrease gradually, but the mechanical properties of concrete decrease slowly at 3 days and 7 days, and decrease obviously at 28 days. Moreover, with the increase of replacement rate of recycled aggregates, the decline trend of mechanical properties is not obvious. Compared with natural aggregate concrete, the 28-day compressive strength, splitting strength and cohesive force of 100% recycled aggregate concrete are reduced by 16.1%, 20.1% and 18.1% respectively, but the mechanical properties meet the requirements of C30 concrete, which provides a reference for engineering application.

Experimental Research on Tensile Strength of Premixed Concrete at Early Ages

2014 ◽  
Vol 556-562 ◽  
pp. 687-691 ◽  
Author(s):  
Xiao Fen Li ◽  
Ping Ren
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Exact Results ◽  
Direct Tension ◽  
Splitting Strength ◽  
Experimental Apparatus ◽  
Structural Applications ◽  
Direct Tensile ◽  
Direct Tensile Strength ◽  
The Relationship

The splitting tensile method for the tensile strength of concrete is usually used in structural applications, so it is great important in the investigating the relation between the direct tensile strength and the splitting strength. But the relationship between the splitting strength and the direct tensile strength is not consolidatly confirmed at home and abroad. In order to obtain the exact results, the experimental apparatus for concrete of the direct tension are designed, which resolves the difficulty of ensuring that the load is truly axial. Tests of the direct tension are performanced on three different concrete mixes (C20,C40,C60) at 3, 7, 14 , 28 and 60 days and the test data do not scatter. The relations between the tensile strength and the cube compressive strength are obtained and a formula for investigating the relation between the direct tensile strength and the splitting strength are proposed.

Experimental Study on Size Effect in Strength of Pervious Concrete and its Associated Factor

2013 ◽  
Vol 634-638 ◽  
pp. 2684-2692 ◽  
Author(s):  
Xi Xi He ◽  
Shan Wu
Keyword(s):  
Compressive Strength ◽  
Size Effect ◽  
Dispersion Coefficient ◽  
Aggregate Size ◽  
Pervious Concrete ◽  
Impact Factors ◽  
Test Results ◽  
Ordinary Concrete ◽  
Splitting Strength ◽  
Mix Proportion

Based on the test results of compressive strength and splitting strength of three kinds of cubic specimens of pervious concrete whose side length is respectively 100mm, 150mm and 200 mm, the size effect on strength and its associated impact factors which include porosity and particle size of coarse aggregate analyzed. In the test, water cement ratio of every group of concrete mix proportion is constant. The main results are as follows: (1) Size effect on concrete of the pervious concrete is greater than that of ordinary concrete; (2) Size effect on splitting strength is greater than that on cubic compressive strength. (3) Size effect on splitting strength significantly increases with the increase of the aggregate size; (4) Weibull modulus m obtained in statistical test for compressive strength equals to 9, which should be more than twice the value of tensile strength. (5)Size effect on strength of concrete is related to its statistical discreteness, that is, the size effect is more obvious when the dispersion coefficient Cv is greater; (6)Weibull’s statistical size effect can be used to describe the size effect on strength indicators of concrete; Theoretical values of Weibull’s statistical size effect derived from the experiment agree with the test results well. (7) The abnormal trends of size effect are related to the abnormal changes of dispersion coefficient.

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