A Micro-Fracture Model and its Application in Hardened Cement Paste

2016 ◽  
Vol 25 (2) ◽  
pp. 096369351602500 ◽  
Author(s):  
Kan Jin ◽  
Cao Wei
Keyword(s):  
Porous Media ◽  
Ultimate Strength ◽  
Elastic Properties ◽  
Cement Paste ◽  
Fracture Model ◽  
Hardened Cement ◽  
Average Pore ◽  
Calculation Results ◽  
Strain Relationship ◽  
Relationship Of

A micro-fracture model is presented to investigate mechanics properties of porous media such as cement paste on basis of micromechanics theory and fracture theory. Relationships between mechanics properties of porous media and the parameters of pores such as shape, size, and porosity are analysed by this model. Calculation results show that, to a hypothetic porous media with same porosity, the ultimate strength and elastic properties are reduced with an increase of average pore diameter. Nano-scale pores have little effect on the ultimate strength of this porous media while the micron-scale pores have great effect on it. The stress-strain relationship of this porous media with the micron-scaled pores is nonlinear obviously. The results also show that the ultimate strength and elastic properties of the porous media are reduced with an increase of the porosity and shape parameter. Mechanics properties of a cement paste with water cement ratio of 0.5 are tested. The calculation results from the model are in agreement with the experimental results.

Laboratory Evaluation of the Stress-Strain relationship of Permeable Concrete

2011 ◽  
Vol 243-249 ◽  
pp. 3259-3262 ◽  
Author(s):  
Manal Hussin ◽  
Zhu Ge Yan ◽  
Frank Bullen ◽  
Weena Lokuge
Keyword(s):  
Pore Space ◽  
Strain Curve ◽  
Laboratory Evaluation ◽  
Fine Aggregate ◽  
Stress Strain ◽  
Average Pore ◽  
Water To Cement Ratio ◽  
Strain Relationship ◽  
New Type ◽  
Relationship Of

The authors conducted research aimed at developing a new type of permeable concrete material with enhanced structural strength. This paper presents and discusses the results of their investigation on the unaxial compressive stress-strain relationship of porous concrete made with two different mix designs with constant water to cement ratio. The concrete mixes were designed with a target compressive strength between 15-25 MPa and target porosity between 10-15% to study the effect of pore sizes on the stress-strain curve. The average pore space was increased by increasing the relative amount of large aggregate. The reduction in the relative amount of fine aggregate increased the average pore space and resulted in a reduction in mix stiffness and a marginal increase in ultimate strength.

The Compressive Behavior of Horizontally Casted Concrete Filled Steel Tubular Members with Consideration of the Process of Concrete Casting

2011 ◽  
Vol 243-249 ◽  
pp. 45-50
Author(s):  
Wen Bo Sun ◽  
Yi Qun Luo ◽  
Wei Huang
Keyword(s):  
Bearing Capacity ◽  
Slenderness Ratio ◽  
Nonlinear Finite Element ◽  
Compressive Behavior ◽  
Element Analysis ◽  
Calculation Results ◽  
Strain Relationship ◽  
Concrete Casting ◽  
Relationship Of ◽  
The Relationship

Concrete casting effect and the hooping effect of concrete filled tubular members is considered in the study of this paper. Firstly, standard stress-strain relationship of concrete and steel is chosen to simulate others’ test, and meanwhile the calculation results by nonlinear finite element analysis are compared with the results of the test. Then the bearing capacity of horizontally casted concrete filled steel tubular members under axial compression is contrasted among different construction processes. Finally, the effect of slenderness ratio of concrete filled tubular members is studied so as to reveal the relationship between the bearing capacity and slenderness ratio.

Research on the Effect of Beads on Properties and Microstructure of Cementing Materials

2013 ◽  
Vol 357-360 ◽  
pp. 1229-1234
Author(s):  
Wen Yang ◽  
Nai Qian Feng ◽  
Ch’ng Guan Bee ◽  
Xiao Qin Liu
Keyword(s):  
Cement Paste ◽  
Packing Density ◽  
Pore Radius ◽  
Mechanical Performance ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Adsorption Method ◽  
Average Pore ◽  
Average Pore Radius ◽  
Composite Cement

The paper studied the effects of different contents of beads on powder pressure entity dense packing density, mechanical performance of composite cement paste. The microstructure of the composite paste is researched by SEM analysis and nitrogen adsorption method. The results show that when the beads content is low, the compacting voidage decreases with the increased bead contents. When the beads content is 30%, composite cementing material achieves the densest packing density. The compacting voidage of composite cement powder has strong correlation with the pore structure and strength of hardened cement paste. When the compacting voidage value reaches minimum, the average pore radius and maximum pore radius of hardened cement paste reach the minimum values. In addition, the 28d strength of composite cement paste is higher than ordinary cement paste.

scholarly journals A numerical study of fatigue of hardened cement paste at the microscale

2021 ◽  
pp. 106401
Author(s):  
Yidong Gan ◽  
Hongzhi Zhang ◽  
Minfei Liang ◽  
Erik Schlangen ◽  
Klaas van Breugel ◽  
...  
Keyword(s):  
Cement Paste ◽  
Numerical Study ◽  
Hardened Cement ◽  
Hardened Cement Paste
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