Simulation of flexural performance of layered ECC-concrete composite beam with fracture mechanics model

Zhang, Jun; Wang, Zhenbo; Ju, Xianchun; Shi, Zhan

doi:10.1016/j.engfracmech.2014.08.016

Cited by 37 publications

(19 citation statements)

References 12 publications

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“…Generally, cement matrixes with compressive strength lower than 50 MPa are used in ECC [3][4][5][6]. Even though the ability of crack width controlling of ECC is strong, a number of applications, such as permanent formwork for concrete structures, steel-concrete composite bridge decks [7][8][9], still wish the material has a relatively higher strength, meanwhile the material has adequate ductility. In these applications, material properties with low moisture transport coefficient, high freezing resistance and high permeability are required as well apart from ductility [9].…”

Section: Introductionmentioning

confidence: 99%

Optimizing design of high strength cement matrix with supplementary cementitious materials

Zhang

Wang

2016

Construction and Building Materials

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In present paper, high strength cementitious matrix, special for high strength engineered cementitious composite (ECC) is designed using two kinds of cement, ordinary Portland cement (OPC) and calcium sulfoaluminate cement (SAC), two sand types (fine and coarse sand) and three supplementary cementitious materials (SCMs), silica fume (SF), slag (SG) and fly ash (FA). Optimized binder proportion with the addition of SF, SG and FA of high strength matrix are obtained through three series compressive and bending tests. The tensile performance of ECC utilizing above high strength matrix is investigated through uniaxial tensile tests. The test results show that through optimizing on the binder composition with SCMs, compressive and bending strength of the low water to binder ratio cement matrix is significantly increased. With a similar fluidity of the fresh mortar and under general curing condition, the compressive strength at 3, 7 and 28 days changes from 25.5, 43.0 and 59.8 MPa to 35.4, 61.9 and 85.6 MPa for SAC mortar with fine sand before and after binder optimization. For OPC fine sand mortar, the compressive strength at 3, 7 and 28 days changes from 45.0, 57.8 and 77.9 MPa to 62.0, 80.6 and 108.0 MPa. Similar trend is observed on the bending strength of those mortars as well. Based on the present study, the optimized binder composition with SF, SG and FA additions in weight are cement:SF:SG:FA=0.7:0.1:0.1:0.1. Using present optimized binder as cementing matrix, the primary tensile results on polyvinyl alcohol (PVA)-steel hybrid fiber reinforced composites show the tensile strength and strain can achieve 7.3 MPa, 0.6% and 8.1 MPa, 0.5% respectively for SAC and OPC cementing system.

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Section: Introductionmentioning

confidence: 99%

Optimizing design of high strength cement matrix with supplementary cementitious materials

Zhang

Wang

2016

Construction and Building Materials

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“…Because coarse aggregates affect the distribution of fibers and weaken the interface transition zone within ordinary concrete, the brittleness of concrete is improved greatly by applying ECC without coarse aggregates [11]. Moreover, ECC has great ability in controlling crack width, and it has a number of applications, such as weight-bearing structures of concrete and steel-concrete composite airport runways and bridge decks, but the high strength and ductility of ECC are still stressed [12][13][14]. It is known that each ton of cement produced generates an equal amount of carbon dioxide, responsible for 5% of global greenhouse gas emission created by human activities [15].…”

Section: Introductionmentioning

confidence: 99%

Use of Silica Fume and GGBS to Improve Frost Resistance of ECC with High‐Volume Fly Ash

Liu

Zhou

et al. 2018

Advances in Civil Engineering

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Fly ash (FA) has been an important ingredient for engineered cementitious composite (ECC) with excellent tensile strain capacity and multiple cracking. Unfortunately, the frost resistance of ECC with high-volume FA has always been a problem. is paper discusses the influence of silica fume (SF) and ground-granulated blast-furnace slag (GGBS) on the frost resistance of ECC with high volume of FA. Four ECC mixtures, ECC (50% FA), ECC (70% FA), ECC (30% FA + 40% SL), and ECC (65% FA + 5% SF), are evaluated by freezing-thawing cycles up to 200 cycles in tap water and sodium chloride solution. e result shows the relative dynamic elastic modulus and mass loss of ECC in sodium chloride solution by freeze-thaw cycles are larger than those in tap water by freeze-thaw cycles. Moreover, the relative dynamic elastic modulus and mass loss of ECC by freeze-thaw cycles increase with FA content increasing. However, the ECC (30% FA + 40% SL) shows a lower relative dynamic elastic modulus and mass loss, but its deflection upon four-point bending test is relatively smaller before and after freeze-thaw cycles. By contrast, the ECC (65% FA + 5% SF) exhibits a significant deflection increase with higher first cracking load, and the toughness increases sharply after freezethaw cycles, meaning ECC has good toughness property.

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“…Detailed numerical process can be found in author's previous publications. 20,21 Material parameters for model input…”

Section: Development Of the Modelmentioning

confidence: 99%

Simulation and test of flexural performance of polyvinyl alcohol-steel hybrid fiber reinforced cementitious composite

Zhang

Wang

et al. 2016

Journal of Composite Materials

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The flexural performance of polyvinyl alcohol-steel hybrid fiber reinforced engineered cementitious composite with characteristics of low drying shrinkage special focus on impacts of steel fiber content and matrix strength has been investigated in both experimental and theoretical aspects in this paper. Four matrix types with water to binder ratio of 0.25, 0.35, 0.45, and 0.55 and three additional steel fiber contents in the composite with polyvinyl alcohol fiber content of 1.7% in volume were used in the test program. The experimental results show that cracking and flexural strength of the composites are increased with the addition of steel fiber. This enhancement becomes more and more pronounced with decreasing of water to binder ratio of the composites. Meanwhile, fracture mechanics-based flexural model is used to simulate the flexure performance of the polyvinyl alcohol -steel hybrid fiber reinforced engineered cementitious composite with characteristics of low drying shrinkage. The model results show that a double peak load is expected of the composites under bending load. The first peak is controlled by the fracture toughness of matrix or cracking strength of matrix, and the second peak is governed by the fiber bridging. The effect of addition of steel fiber in engineered cementitious composite with characteristics of low drying shrinkage on the first peak is unapparent. The impact of steel fiber on the second peak is significant. This enhancement of additional steel fiber gradually decreases with the decrease of water to binder ratio of the matrix, which coincides well with the experimental findings. The test results are compared to the model and reasonable agreement is found.

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Simulation of flexural performance of layered ECC-concrete composite beam with fracture mechanics model

Cited by 37 publications

References 12 publications

Optimizing design of high strength cement matrix with supplementary cementitious materials

Optimizing design of high strength cement matrix with supplementary cementitious materials

Use of Silica Fume and GGBS to Improve Frost Resistance of ECC with High‐Volume Fly Ash

Simulation and test of flexural performance of polyvinyl alcohol-steel hybrid fiber reinforced cementitious composite

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