Mix Design of Recycled Coarse Aggregate Self‐Compacting Concrete Based on Orthogonal Test and Analysis of Mercury Intrusion Porosimetry

Gao, Songpu; Qing, Liu; Han, Fengxia; Fu, Yu

doi:10.1155/2021/4829673

Cited by 10 publications

(3 citation statements)

References 41 publications

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“…The CPRAM is characterized by high porosity and low strength compared with conventional concrete materials. To improve its mechanical properties, a total of nine cementitious material proportions were designed based on the orthogonal design method [38,39]. In this research, RA, fly ash, blast furnace slag, and silica fume were considered for the design Sustainability 2023, 15, 14063 5 of 17 of CPRAM mixtures, and three different utilization ratios for these materials to optimize the design of CPRAM mixtures.…”

Section: Cpram Designmentioning

confidence: 99%

Experimental Study on the Mechanical Properties and Permeability of Cement-Stabilized Permeable Recycle Aggregate Materials

Zhi,

Yang,

Zhang

et al. 2023

Sustainability

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This paper designed cement-stabilized permeable road subgrade materials. Construction demolition waste with recycled aggregate replaced natural aggregate in cement-stabilized materials to utilize recycled resources for construction solid waste. This paper tests the compressive strength, water permeability, bending strength, and compressive resilience modulus of cement-stabilized permeable recycled aggregate materials under different cementitious additive ratios. The results show that at a recycled aggregate proportion of 30% in cement-stabilized permeable recycled aggregate material, the 7-d unconfined compressive strength exceeds 3.5 MPa, and the permeability coefficient surpasses 3.5 mm/s, which can meet the roadbed requirements in China. The incorporation of recycled aggregates significantly reduces the mechanical properties and water permeability of cement-stabilized permeable recycled aggregate materials, while cementitious additives improve the mechanical properties. Specifically, red brick, old concrete, and ceramics in recycled aggregates weaken the mechanical properties of the skeleton structure of cement-stabilized permeable recycled aggregate materials, and the compressive strength, bending strength, and compressive resilience modulus decrease with the recycled aggregate content. Cementitious additives can fill the micro-pores of the interface transition zone of cement-stabilized permeable recycled aggregate materials to improve the cementation strength between aggregates.

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Section: Cpram Designmentioning

confidence: 99%

Experimental Study on the Mechanical Properties and Permeability of Cement-Stabilized Permeable Recycle Aggregate Materials

Zhi,

Yang,

Zhang

et al. 2023

Sustainability

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“…The concrete mix greatly affects the compressive strength of the concrete after it hardens. If the density of air pores is 5 %, the compressive strength of concrete will be reduced by 35 %, and if the density of air pores is 10 %, the compressive strength of concrete will be reduced by 60 % [11].…”

Section: Introductionmentioning

confidence: 99%

The effect of the use of recycled coarse aggregate on the performance of self-compacting concrete (SCC) and its application

Suryadi

Qomariah

Susilo

2022

EEJET

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The demand for self-compacting concrete is very high because this concrete has high flowability and has resistance to segregation. Natural aggregates are of high value, while concrete demolition materials are abundant and of low value. So that the recycled coarse aggregate can be used as concrete material, this study analyzes the characteristics of Self Compacting Concrete (SCC) using recycled coarse aggregate from construction waste. Tests for aggregate wear, aggregate hardness, compressive strength of concrete and tensile strength of concrete were carried out. The wear test refers to the standard AASHTO T-96-74, ASTM C-131-55 and SNI 2417-2008. This test uses recycled coarse aggregate that has been washed so that the sludge content is clean; after that, it was baked with the used aggregate, the aggregate that passed the 12.5 mm sieve and was retained in the 9.5 mm sieve. The test object is pressurized 40 tons at a speed of 4 tons/minute. Concrete Compressive Strength Test refers to SNI 03-1974-2011, using a scale with an accuracy of 0.3 % of the weight of the concrete, a concrete press machine and a capping machine. While the split tensile strength test of concrete refers to SNI 03-2491-2014, carried out on days 7, 21 and 28 with a cylindrical test object. Variations of recycled aggregates start from 0 %, 25 %, 50 %, 75 %, and 100 %. The design's compressive strength is 25 MPa. The results showed that the recycled aggregates had good gradation, high absorption and low specific gravity compared to natural aggregates. The recycled coarse aggregate reduces the compressive strength of the concrete and causes a decrease in a slump, thereby reducing the split tensile strength of the concrete

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“…Industrial researchers often use two-level factorials as their first attempt at DOE [7][8][9]. These designs include all combinations of each factor at their high and low levels.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Experiments and Neural Networks Analysis of Concrete Performance

Liu

Tan

et al. 2022

Water

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In order to explore the possibility that adding an appropriate amount of alkaline activator into fly ash cement may improve the early activity of fly ash and ensure the strength performance of concrete, this study analyzed the influence of 0–30% fly ash substitute on the early and late (3–28 days) compressive strength of concrete by using three methods, namely, the concrete laboratory test, orthogonal test, and neural network, under the condition of 0.5 water binder. We obtained the following results: (1) The strength of the concrete mixed with fly ash at the same alkali and the same age decreases with the increase of fly ash content and decreases with the decrease of age; the strength is the highest when the alkali content is 6% or 5%. (2) The higher the content of fly ash, the lower the strength of the mixture, and the greater the decrease of the early strength of the mixture, while the optimum dosage of NaOH is the same. (3) Orthogonal experimental design can be effectively used to analyze the primary and secondary degree of each factor and the best combination of them (cement, fly ash, NaOH, standard, water, etc.). (4) High correlations between the compressive strength and the component composition of concrete can be obtained using the prediction abilities of the neural networks. The above test results show that on the basis of the concrete compressive strength test, the comprehensive application of the orthogonal test and the neural network method can be used to analyze the relationship between strength and the variables and to test the influence of the variables and their interaction on concrete strength, and the results are accurate and reliable.

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Mix Design of Recycled Coarse Aggregate Self‐Compacting Concrete Based on Orthogonal Test and Analysis of Mercury Intrusion Porosimetry

Cited by 10 publications

References 41 publications

Experimental Study on the Mechanical Properties and Permeability of Cement-Stabilized Permeable Recycle Aggregate Materials

Experimental Study on the Mechanical Properties and Permeability of Cement-Stabilized Permeable Recycle Aggregate Materials

The effect of the use of recycled coarse aggregate on the performance of self-compacting concrete (SCC) and its application

Orthogonal Experiments and Neural Networks Analysis of Concrete Performance

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