碱激发海砂再生骨料混凝土的制备及其拉伸强度的确定

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Abstract Much CO₂ emission during the cement production pollutes the environment significantly. The resource of natural sands and stones becomes scarcer. Large amounts of industrial waste (slag and fly ash) and construction and demolition waste give huge pressure on environment. Thus, the intention of this paper is to produce a new type of concrete, i.e., alkali-activated sea sand recycled aggregate concrete (AASRAC), by using seawater, sea sand, alkali-activated ground granulated blast furnace slag and fly ash instead of cement, and crushed demolition waste instead of natural stones. It is then essential to evaluate the tensile resistance of the new concrete considering its future application in ocean engineering. But it is too difficult to obtain the true tensile strength based on the conventional method due to the non-uniformity and micro-defects in the materials. Based on the boundary effect model in non-linear fracture mechanics, a linear equation of peak load with respected to the true tensile strength is then derived by incorporating the parameters reflecting the material heterogeneity and discontinuity. The size-independent tensile strength and fracture toughness can be predicted by using the linear equation only if the peak load is determined from the test. Subsequently, the means, upper and lower limits of two fracture parameters with 95% reliability are determined based on the normal distribution analysis. Moreover, different from ordinary concrete, the failure mode of AASRAC is more than 80% of the recycled coarse aggregates fractured. Thus, the tensile resistance of the new concrete depends on the tensile strength of alkali-activated mortar and recycled coarse aggregates.

Key words： alkali-activated material sea sand recycled aggregate tensile strength non-linear fracture mechanics boundary effect

Published: 09 December 2021

CLC number:

TU501

Fund:This work was financially supported by the National Natural Science Foundation of China (51778591).

About author:: Shutong Yang is a professor and Ph.D. supervisor in Ocean University of China. He received his Ph.D. degree of structural engineering in Dalian University of Technology in October in 2008. He works at Department of Civil Engineering in College of Engineering in Ocean University of China since October 2009. The research interest includes fracture mechanics of concrete, theory and engineering application of strengthening and anchorage in concrete structures, recycling of construction solid waste, etc. He published more than 30 research papers in the native and international high-level journals of civil engineering as the first and corresponding authors. 8 patents are awarded as the first inventor including natio-nal invent patents and utility models. He received one Provincial Science and
Technology Progress Award and one Municipal Natural and Science Award. Moreover, he hosts 4 National Natural Science Foundation Projects of China, 1 Major Program of Natural Science Foundation of Shandong Province, 1 Key Research and Development Program of Shandong Province, 2 Science and Technology Program of Qingdao, etc.,,

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Cite this article:

YANG Shutong,LI Linzhen,YU Miao. Production and Tensile Strength Determination of Alkali-activated Sea Sand Recycled Aggregate Concrete[J]. Materials Reports, 2021, 35(z2): 176-182.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/Iz2/176

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