scholarly journals Influence of the Aggregate Surface Conditions on the Strength of Quick-Converting Track Concrete

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 543 ◽  
Author(s):  
Rahwan Hwang ◽  
Il-Wha Lee ◽  
Sukhoon Pyo ◽  
Dong Joo Kim
Keyword(s):  
Fracture Toughness ◽  
Experimental Study ◽  
Compressive Strength ◽  
Water Saturation ◽  
Interfacial Fracture ◽  
Dust Particles ◽  
Interfacial Fracture Toughness ◽  
Surface Conditions ◽  
Cement Ratio ◽  
Water Cement Ratio

This experimental study investigates the effects of the aggregate surface conditions on the compressive strength of quick-converting track concrete (QTC). The compressive strength of QTC and interfacial fracture toughness (IFT) were investigated by changing the amount of fine abrasion dust particles (FADPs) on the aggregate surface from 0.00 to 0.15 wt% and the aggregate water saturation from 0 to 100%. The effects of aggregate water saturation on the compressive strength of the QTC and IFT were notably different, corresponding to the amount of FADPs. As the aggregate water saturation increased from 0 to 100%, in the case of 0.00 wt% FADPs, the IFT decreased from 0.91 to 0.58 MPa∙mm1/2, and thus, the compressive strength of the QTC decreased from 34.8 to 31.4 MPa because the aggregate water saturation increased the water/cement ratio at the interface and, consequently, the interfacial porosity. However, as the aggregate water saturation increased from 0 to 100%, in the case of 0.15 wt% FADPs, the compressive strength increased from 24.6 to 28.1 MPa, while the IFT increased from 0.41 to 0.88 MPa∙mm1/2 because the water/cement ratio at the interface was reduced as a result of the absorption by the FADPs on the surface of the aggregates and the cleaning effects of the aggregate surface.

Experimental Study on Compressive Strength and Flexural Strength of Combined Aggregate Concrete

2014 ◽  
Vol 1065-1069 ◽  
pp. 1899-1902
Author(s):  
Yan Kun Zhang ◽  
Yu Cheng Wang ◽  
Xiao Long Wu
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Test Method ◽  
Aggregate Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Comprehensive Test

In this article, the flexural strength of combined aggregate concrete with four kinds of water-cement ratio (0.3,0.35.0.4, 0.45), and six ceramsite replace rate (0%, 20%, 40%, 60%, 80%, 60%) are studied with comprehensive test method. Experiment shows that the ceramsite replace rate of combined aggregate has greater influence on the flexural strength than the water-cement ratio. The flexural strength increases with the increasing of compressive strength, and the formula of the flexural strength and compressive strength of combined aggregate concrete is given.

Experimental Study of Mechanical Properties of Concrete after Freeze-Thaw Exposures

2014 ◽  
Vol 912-914 ◽  
pp. 131-135
Author(s):  
Xiang Ping Fu ◽  
Xiao Xue Liu ◽  
Yi Ze Sun ◽  
Pei Huang ◽  
Yu Chen Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Compressive Strength ◽  
Elasticity Modulus ◽  
Concrete Specimen ◽  
Concrete Compressive Strength ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Freeze Thaw ◽  
Cold Area

The experiment studies how the freeze-thaw cycles influence concrete compressive strength and elasticity modulus with different water-cement ratio under the air-entraining agent and zero of that value respectively. It can be found that modulus of elasticity and compressive strength of the concrete specimen reduced significantly when there is air-entraining agent; the durability of freeze-thaw resistance, however, makes great improvement; as the cement increases, both of them improves effectively. Through the comparison of concrete compressive strength and elastic modulus with different water-cement ratio and air-entraining agent, the optimal water-cement ratio and air-entraining agent were determined. The results of experiment can be used in concrete engineering design in severe cold area.

Experimental Study on the Splitting Tensile Strength of Recycled Sintered Brick-Tile Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 2167-2175 ◽  
Author(s):  
Ling Jun Xie ◽  
Ai Liang Zhai
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Splitting Tensile Strength ◽  
Water Quantity ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Failure Patterns ◽  
Proportional Relationship

In this paper, the splitting tensile strength experiments of recycled sintered brick-tile concrete with different water-cement ratio, sand rate and water quantity were carried out, and the change law of splitting tensile strength with above three factors was acquired and failure patterns of the samples were analyzed. The results showed that the effects of sand rate and water quantity were not clear, while water-cement ratio was relatively significant and the splitting tensile strength was inversely proportional relationship with it. And the relation between the splitting tensile strength and the cubic compressive strength was summarized from the results.

Experimental Study on Strength of Recycled Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1282-1285
Author(s):  
Hai Yong Cai ◽  
Li Bin Fu ◽  
Ling Bo Dang
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Great Influence ◽  
Recycled Concrete ◽  
Replacement Ratio ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Concrete Mechanical Properties

Influence of replacement ratio and water-cement ratio on the recycled concrete mechanical properties were analyzed by testing the compressive strength and tensile strength of the recycled concrete. Results show that the mechanical properties of recycled concrete, compared with common concrete, can meet the requirements of the project. Water-cement ratio has great influence on compressive strength and tensile strength, replacement ratio has obvious influence on compressive strength but little on tensile.

Experimental Study of Compression and Carbonation in Concrete Subjected to Freeze-Thaw Environment

2014 ◽  
Vol 887-888 ◽  
pp. 814-818
Author(s):  
Li Xue Wang ◽  
Xiao Ting Shan ◽  
Yu Qing Zhang ◽  
Chun Sheng Li ◽  
Zai Xing Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Test Method ◽  
Carbonation Depth ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Freeze Thaw ◽  
Concrete Properties

In order to research the changes of concrete properties in freeze-thaw environment, five concrete samples with water-cement ratio respectively equal to 0.60, 0.65, 0.70, 0.75 and 0.80 were tested in freeze-thaw environment according to GB/T50082-2009 concrete rapid freeze-thaw cycles test method. Five samples were carried out 0, 25, 50, 75, 100 times faster freeze-thaw cycles test. With the increasing number of freeze-thaw cycles, the concrete relative dynamic modulus of elasticity loss rises, the compressive strength drops, and the carbonation depth increases. The greater the water-cement ratio of concrete specimens with freeze-thaw cycles, the greater the degree of damage increases.

scholarly journals The Study of Flowability and The Compressive Strength of Grout/Mortar Proportions for Pre- placed Concrete Aggregate (PAC)

2019 ◽  
Vol 280 ◽  
pp. 04010
Author(s):  
Nursiah Chairunnisa ◽  
Arie Febry Fardheny
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Concrete Aggregate ◽  
Aggregate Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Chemical Admixtures ◽  
Test Result

This experimental study is focused on the performance of appropriate grout/mortar for pre-placed aggregate concrete (PAC) incorporating superplasticizer in the mortar mixture regarding the flowability and strength of grout or mortar. Twenty-one samples of specimens were prepared. The parameter tests consist of water-cement ratios, cement sand ratios and variation dosages of superplasticizer. To examine the flowability/fluidity of grout or mortar, the flow cone test was applied. The flow cone test result indicated that there were three proportional grout that can meet the requirement for fluidity according to ASTM C-939. The compressive strength of specimens was tested. It was concluded that the composition of grout with containing the percentage of 0.7% by weight of cement of superplasticizer as chemical admixtures at a water-cement ratio of 0.6 and a cement-sand ratio of 0.5 is the proper composition of grout for pre-placed aggregate concrete (PAC).

scholarly journals Effectiveness of Locally Available Superplasticizers on the Workability and Strength of Concrete

2018 ◽  
Vol 4 (12) ◽  
pp. 2919 ◽  
Author(s):  
Ashfaque Ahmed Jhatial ◽  
Samiullah Sohu ◽  
Muhammad Tahir Lakhiar ◽  
Jam Shahzaib ◽  
Ahsan Ali Buriro
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Water Content ◽  
Research Work ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Optimum Dosage ◽  
Chemical Admixtures ◽  
Compressive And Flexural Strengths

Though superplasticizers (SP) are well-known chemical admixtures which are added into concrete to enhance the workability and achieve higher strength while reducing the water content. But the rapid increase in different SP in Pakistan has created confusion on the effectiveness of SP. This experimental study was carried out to study the effect of locally available SP on the workability and compressive strength of M15 grade concrete. Three different SP were utilized, with dosage ranging from 0.5% to 2.5% with an increment of 0.5%. The water-cement ratio remained constant at 0.5 for all samples. Based upon the results, all three SP increased the workability as well as strength of concrete. The optimum dosage was determined to be 1.5% to 2.00% for all three SPs used in this research work. BASF 561 was determined to be more effective, as it achieved the maximum workability as well as compressive and flexural strengths.

Experimental Study of Interfacial Fracture Toughness in a SiNx/PMMA Barrier Film

2012 ◽  
Vol 4 (12) ◽  
pp. 6711-6719 ◽  
Author(s):  
Yongjin Kim ◽  
Anuradha Bulusu ◽  
Anthony J. Giordano ◽  
Seth R. Marder ◽  
Reinhold Dauskardt ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Experimental Study ◽  
Interfacial Fracture ◽  
Interfacial Fracture Toughness ◽  
Barrier Film

Research on the Influence of the Steel Fiber on RPC Performance

2014 ◽  
Vol 1065-1069 ◽  
pp. 1833-1837
Author(s):  
Zheng Wang ◽  
Qi Fan Wang ◽  
Lin Zhang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Steel Fiber ◽  
Structural Strength ◽  
Reactive Powder Concrete ◽  
Fiber Types ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Shock Resistance ◽  
Reactive Powder

Experimental study on the influence of the steel fiber types, content and water-cement ratio on the reactive powder concrete (RPC) performance is conducted. The results show the influence law that the 3 factors to compressive strength and shock-resistance of steel fiber RPC. In this sense, it is of vital importance to enhance structural strength, and to improve the anti-seismic and anti-detonating capacities of the key engineering in urban.

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