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Prof. Dr. Guohui Zhang
Kunming University of Science and Technology

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Research Keywords & Expertise

0 Crack detection
0 Cement-Based Materials
0 Mechanical property testing
0 temperature and humidity retrieval
0 porosity and parameters of porosity

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Journal article
Published: 08 February 2021 in Sustainability
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In this research, we developed a four-phase model, which takes the aggregate gradation and porosity into account in the prediction of the elastic modulus of concrete, based on the micromechanical theories. The model has been verified with experimental results. First, using the Mori Tanaka and the differential self-consistent (DSC) methods, the pores in both the mortar and interfacial transition zone (ITZ) were homogenized. Then, the continuously graded aggregates were divided into finite aggregate size intervals. Further, using the generalized self-consistent model and multiphase composite model derived from the Mori Tanaka method, an aggregate gradation model for the prediction of the elastic modulus of concrete was developed. By simulating the pores in concrete with expanded polystyrene sphere (EPS) grains, the effect of overall porosity on the elastic modulus of concrete was investigated. The research results show that aggregate gradation and porosity have remarkable influence on the elastic modulus of concrete, and the proposed model is effective to estimate the elastic modulus of concrete, the deviation between the predicted elastic modulus and experimental elastic modulus is less than 8%. The elastic modulus decreases with increasing ITZ porosity. However, for ITZ porosity exceeding 40%, the decrease in the elastic modulus is large with increasing ITZ porosity. For a fixed overall porosity, the ITZ porosity owned more influences than the mortar porosity on the elastic modulus of concrete. Enhancing the ITZ elastic modulus and decreasing the ITZ thickness are efficient in increasing the elastic modulus of concrete.

ACS Style

Guohui Zhang; Zhendong Yang; Yizhi Yan; Mingming Wang; Liang Wu; Hongjun Lei; YanShuang Gu. Experimental and Theoretical Prediction Model Research on Concrete Elastic Modulus Influenced by Aggregate Gradation and Porosity. Sustainability 2021, 13, 1811 .

AMA Style

Guohui Zhang, Zhendong Yang, Yizhi Yan, Mingming Wang, Liang Wu, Hongjun Lei, YanShuang Gu. Experimental and Theoretical Prediction Model Research on Concrete Elastic Modulus Influenced by Aggregate Gradation and Porosity. Sustainability. 2021; 13 (4):1811.

Chicago/Turabian Style

Guohui Zhang; Zhendong Yang; Yizhi Yan; Mingming Wang; Liang Wu; Hongjun Lei; YanShuang Gu. 2021. "Experimental and Theoretical Prediction Model Research on Concrete Elastic Modulus Influenced by Aggregate Gradation and Porosity." Sustainability 13, no. 4: 1811.

Journal article
Published: 14 December 2020 in Materials
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Concrete structures are often in different humidity conditions that have a significant impact on the elastic modulus of concrete, therefore, systematic research on the evolution of the law of concrete elastic modulus under different humidity conditions is needed. In this study, the variation laws of the water saturation of concrete specimens with strength grades C15, C20, and C30 were obtained, and then the influence laws of the water saturation on the concrete axial compressive strength were carried out, and the prediction model of elastic modulus of concrete with respect to water saturation was constructed. The results showed that the water saturation of concrete with strength grades C15, C20, and C30 increased with an extension of immersion time, and the water saturation showed an approximately linear rapid growth within three soaking hours, reaching 47.56%, 71.63%, and 47.29%, respectively. Note, the concrete reached saturation state when the soaking time was 240 h. The axial compressive strength with strength grades C15, C20, and C30 decreased with increased water saturation, and the axial compressive strength of saturated concrete decreased by 27.25%, 21.14%, and 20.76%, respectively, as compared with the dry state concrete. The elastic modulus of concrete with strength grades C15, C20, and C30 increased with increased water saturation, and the elastic modulus of saturated concrete was 1.18, 1.19, and 1.24 times higher than those of dry concrete, respectively.

ACS Style

Guohui Zhang; Changbing Li; Hai Wei; Mingming Wang; Zhendong Yang; YanShuang Gu. Influence of Humidity on the Elastic Modulus and Axis Compressive Strength of Concrete in a Water Environment. Materials 2020, 13, 5696 .

AMA Style

Guohui Zhang, Changbing Li, Hai Wei, Mingming Wang, Zhendong Yang, YanShuang Gu. Influence of Humidity on the Elastic Modulus and Axis Compressive Strength of Concrete in a Water Environment. Materials. 2020; 13 (24):5696.

Chicago/Turabian Style

Guohui Zhang; Changbing Li; Hai Wei; Mingming Wang; Zhendong Yang; YanShuang Gu. 2020. "Influence of Humidity on the Elastic Modulus and Axis Compressive Strength of Concrete in a Water Environment." Materials 13, no. 24: 5696.

Journal article
Published: 09 September 2019 in Applied Sciences
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In order to comprehensively evaluate the properties of rock-filled concrete (RFC) with the strength of C15, lab experimental test and in-situ test are applied to explore the mechanical, hydraulic, ultrasonic characteristics of RFC in Hantang reservoir dam. Four types of defects within RFC are shown from the appearance of borehole cores specimens: (1) large sized voids existing in interfacial transition zone (ITZ) between self-compacting concrete (SCC) and rock block (RB); (2) bad cohesion in ITZ; (3) joints within rock block; (4) voids within SCC. For hydraulic aspects, the average porosity of RFC is 14.10%; the permeability rate of RFC ranges from 2.41 Lu to 10.41 Lu, with the average of 11.32 Lu, occasionally more than 25.52 Lu due to interconnected defects. For ultrasonic aspects, the ultrasonic velocity of RFC conforms to lognormal distribution, with the average of 2993.3 m/s and standard deviation of 650.5 m/s. For mechanical aspects, the average cubic compressive strength of RFC is 22.55 Mpa, with the standard deviation of 4.09 Mp. Thus the data shows a relatively great dispersion due to uneven distribution of some defects in RFC, which deteriorate the quality of RFC. Through the experimental investigation, it is shown that the quality of massive RFC in the Hantang dam is obviously non-homogeneous, mainly influenced by construction technology.

ACS Style

Hai Wei; Guohui Zhang; Fanfan Sun; Mingming Wang; Wenhai Li; Juncai Xu. Experimental Research on the Properties of Rock-Filled Concrete. Applied Sciences 2019, 9, 3767 .

AMA Style

Hai Wei, Guohui Zhang, Fanfan Sun, Mingming Wang, Wenhai Li, Juncai Xu. Experimental Research on the Properties of Rock-Filled Concrete. Applied Sciences. 2019; 9 (18):3767.

Chicago/Turabian Style

Hai Wei; Guohui Zhang; Fanfan Sun; Mingming Wang; Wenhai Li; Juncai Xu. 2019. "Experimental Research on the Properties of Rock-Filled Concrete." Applied Sciences 9, no. 18: 3767.

Journal article
Published: 24 May 2019 in Sustainability
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This paper presents an experiment to investigate the influence of moisture on the static mechanical properties of concrete, and prediction equations for strength and fracture toughness of concrete at different strength grades, relative to water saturation, were established respectively. The research results show that all of the compressive strength, splitting tensile strength, and fracture toughness of concrete exhibit an approximately linearly decreasing trend with the increase in water saturation. For saturated concrete specimens with w/c 0.65, 0.55, 0.42 compared with dry ones, compressive strength decreases by 40.08%, 36.08%, and 33.73%, respectively, splitting tensile strength decreases by 45.39%, 42.61%, and 35.18%, respectively, and fracture toughness decreases by 57.31%, 49.92%, and 46.76%, respectively. The higher the water saturation of concrete, the larger the slope of the ascending part of the uniaxial compressive stress-strain curve, and the smaller the peak strain corresponding to the peak compressive stress, then in this case, both crack mouth opening displacement and loading point deflection corresponding to the critical load on three-point bending beam, decrease. Ingress of water causes the deformation capacity to decrease, and the toughness to weaken, which are unfavorable to the mechanical properties of concrete.

ACS Style

Guohui Zhang; Xiaohang Li; Zongli Li. Experimental Study on Static Mechanical Properties and Moisture Contents of Concrete Under Water Environment. Sustainability 2019, 11, 2962 .

AMA Style

Guohui Zhang, Xiaohang Li, Zongli Li. Experimental Study on Static Mechanical Properties and Moisture Contents of Concrete Under Water Environment. Sustainability. 2019; 11 (10):2962.

Chicago/Turabian Style

Guohui Zhang; Xiaohang Li; Zongli Li. 2019. "Experimental Study on Static Mechanical Properties and Moisture Contents of Concrete Under Water Environment." Sustainability 11, no. 10: 2962.

Journal article
Published: 02 November 2018 in Construction and Building Materials
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On a microscopic scale, concrete was regarded as a three-phase composite consisting of coarse aggregate, cement mortar and interface transition zone (ITZ). The coarse aggregates and their peripheral ITZ were equated with equivalent particles blended in cement mortar through two equivalent processes. Taking the effects of ITZ, aggregate gradation, maximum aggregate size and the interactions among equivalent particles into consideration, the average stress of microscopic phase of concrete was calculated based on a micromechanics model, and the stress concentration within ITZ phase was further solved. Adopting the Drucker-Prager criterion to decide the failure of the microscopic phases, the cracking strength, yield strength and ultimate strength of the concrete were calculated respectively when the ITZ cracking, the ITZ failure and the mortar failure occurred. The results were compared with test data to verify the effectiveness and reliability of the model. Based on the model, the influence of the elastic modulus of coarse aggregate, the coarse aggregate content and the elastic modulus of ITZ on the yield strength and ultimate strength are discussed. This paper presents an approach to explore the connection between macroscopic strength and microscopic phase strength, which provides a theoretical reference for studying the failure mechanism of concrete.

ACS Style

Dongqi Li; Zongli Li; Yueming Yin; Xiangqin Du; Guohui Zhang. Prediction of cracking, yield and ultimate strengths based on the concrete three-phase micromechanics model. Construction and Building Materials 2018, 193, 416 -425.

AMA Style

Dongqi Li, Zongli Li, Yueming Yin, Xiangqin Du, Guohui Zhang. Prediction of cracking, yield and ultimate strengths based on the concrete three-phase micromechanics model. Construction and Building Materials. 2018; 193 ():416-425.

Chicago/Turabian Style

Dongqi Li; Zongli Li; Yueming Yin; Xiangqin Du; Guohui Zhang. 2018. "Prediction of cracking, yield and ultimate strengths based on the concrete three-phase micromechanics model." Construction and Building Materials 193, no. : 416-425.

Journal article
Published: 29 July 2018 in Construction and Building Materials
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Dry-based concrete specimens must be obtained to investigate a moisture effect, but the drying law and strength change vary for concrete of different strength grades under different drying temperatures. In this work, concrete specimens with different strength grades are dried in a thermostatic electric drier at constant temperatures of 60, 80, 105, 120 and 150 °C, and the changes in mass, ultrasonic data and strength of the specimens before and after drying are analysed. The test results demonstrate that the drying stages of concrete with different strength grades at different drying temperatures are generally the same even with variations in drying rate, time and the total water mass loss. Considering the drying temperature and strength grade, a model for concrete drying is obtained based on the modified Page model II. After drying, changes in the concrete compressive and splitting tensile strengths of different strength grade materials are highly similar and are slightly higher than those before drying. The relative strength initially decreases and subsequently increases with increasing drying temperature. The drying temperature 100–125 °C is recommended as the optimal drying temperature for different strength grades of concrete according to the minimal strength change. Further analysis shows that the change in concrete strength is the result of mutual competition between the damage caused by water evaporation and the density increase caused by drying.

ACS Style

Jinsheng Han; Zongli Li; Hengjie Liu; Guohui Zhang; Cong Tan; Jinjia Han. Study on the process of isothermal continuous drying and its effect on the strength of concrete of different strength grades. Construction and Building Materials 2018, 187, 14 -24.

AMA Style

Jinsheng Han, Zongli Li, Hengjie Liu, Guohui Zhang, Cong Tan, Jinjia Han. Study on the process of isothermal continuous drying and its effect on the strength of concrete of different strength grades. Construction and Building Materials. 2018; 187 ():14-24.

Chicago/Turabian Style

Jinsheng Han; Zongli Li; Hengjie Liu; Guohui Zhang; Cong Tan; Jinjia Han. 2018. "Study on the process of isothermal continuous drying and its effect on the strength of concrete of different strength grades." Construction and Building Materials 187, no. : 14-24.

Journal article
Published: 01 May 2018 in Construction and Building Materials
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ACS Style

Dongqi Li; Zongli Li; Congcong Lv; Guohui Zhang; Yueming Yin. A predictive model of the effective tensile and compressive strengths of concrete considering porosity and pore size. Construction and Building Materials 2018, 170, 520 -526.

AMA Style

Dongqi Li, Zongli Li, Congcong Lv, Guohui Zhang, Yueming Yin. A predictive model of the effective tensile and compressive strengths of concrete considering porosity and pore size. Construction and Building Materials. 2018; 170 ():520-526.

Chicago/Turabian Style

Dongqi Li; Zongli Li; Congcong Lv; Guohui Zhang; Yueming Yin. 2018. "A predictive model of the effective tensile and compressive strengths of concrete considering porosity and pore size." Construction and Building Materials 170, no. : 520-526.

Journal article
Published: 01 March 2017 in Construction and Building Materials
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ACS Style

Guohui Zhang; Zongli Li; Linfei Zhang; Yujuan Shang; Hang Wang. Experimental research on drying control condition with minimal effect on concrete strength. Construction and Building Materials 2017, 135, 194 -202.

AMA Style

Guohui Zhang, Zongli Li, Linfei Zhang, Yujuan Shang, Hang Wang. Experimental research on drying control condition with minimal effect on concrete strength. Construction and Building Materials. 2017; 135 ():194-202.

Chicago/Turabian Style

Guohui Zhang; Zongli Li; Linfei Zhang; Yujuan Shang; Hang Wang. 2017. "Experimental research on drying control condition with minimal effect on concrete strength." Construction and Building Materials 135, no. : 194-202.