scholarly journals The Relationship between Compressive Strength and Pore Structure of the High Water Grouting Material

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 865
Author(s):  
Youmin Han ◽  
Junwu Xia ◽  
Linli Yu ◽  
Qiong Su ◽  
Xiaomiao Chen
Keyword(s):  
Compressive Strength ◽  
Pore Structure ◽  
Pore Diameter ◽  
High Water ◽  
Hydration Products ◽  
Characteristic Parameters ◽  
Grey Correlation ◽  
Grouting Material ◽  
Binder Ratio ◽  
The Relationship

To elucidate the relationship between compressive strength and pore structure of the high water grouting material with different water-binder ratios and CaO contents, the compressive strength was tested while pore structure including pore characteristic parameters and pore diameter distribution were investigated by BET, MIP, and 3D-XRM. Moreover, the evolution of hydration products was observed by TGA and SEM, illustrating the reactive mechanism of the material. Furthermore, the grey correlation coefficients between compressive strength and pore structure parameters were illustrated according to the grey correlation theory. The results show that CaO content in lime is proportional to the compressive strength with the water-binder ratio of 1.0 or 1.5, while the inverse trend appears with the water-binder ratio of 2.0. The high water grouting material belongs to the macropore material with the pores mainly within 100 nm to 2 μm. Its hydration products contain ettringite crystals, aluminum gels, and C-S-H gels. The productions of the hydration products are positively correlated with its compressive strength. In addition, the compressive strength of the high water grouting material is closely related to the pore characteristic parameters and the pore size distribution, especially the porosity, the most probable pore diameter, and the pore volumes within 100~500 nm and 10~100 nm.

scholarly journals Investigation of the Effects of Magnesium-Sulfate as Slag Activator

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 305 ◽  
Author(s):  
Choonghyun Kang ◽  
Taewan Kim
Keyword(s):  
Compressive Strength ◽  
Pore Structure ◽  
Magnesium Sulfate ◽  
Great Influence ◽  
Hydration Products ◽  
X Ray Diffraction ◽  
Binder Ratio ◽  
Mechanical And Microstructural Properties ◽  
Activated Slag ◽  
Alkali Activated

This study is about the mechanical and microstructural properties of alkali-activated slag (AAS) paste using magnesium sulfate (MS) as an activator. MS is 2%, 4%, 6%, 8% and 10% contents of binder weight and water-binder ratio is 0.35. Compressive strength, X-ray diffraction, mercury-intrusion porosimetry, and thermal analysis were performed for analysis. The MS contents at which the maximum compressive strength appeared varied according to the measurement age. Hydration products affecting compressive strength and pore structure were ettringite and gypsum. As a result, the changes of ettringite and gypsum depending on the contents of MS have a great influence on the pore structure, which causes the change of compressive strength. The high MS contents increases the amount of gypsum in the hydration products, and the excess gypsum causes high expansion, which increases the diameter and amount of pores, thereby reducing the compressive strength.

The Relationship between the Strength and the Pore Structures of Cement Paste with Mineral Admixtures

2011 ◽  
Vol 250-253 ◽  
pp. 104-108 ◽  
Author(s):  
Yue Li ◽  
Jun Ling Bao ◽  
Chun E Sui ◽  
Xiu Li Du
Keyword(s):  
Compressive Strength ◽  
Pore Structure ◽  
Cement Paste ◽  
Mapping Function ◽  
Mineral Admixtures ◽  
Hardened Cement ◽  
Cement Pastes ◽  
Binder Ratio ◽  
Water To Binder Ratio ◽  
The Relationship

This paper presents the effects of mineral admixtures and the water to binder ratio (W/B) on the tensile and compressive strength and micro pore structure of hardened cement pastes. The test results show that: with the water to binder ratio increasing, the tensile and compressive strength of cement paste with different mineral admixtures will decrease, air content and mean pore diameter will decrease and the cement paste with the ground blast furnace slag is the lowest. The artificial neural network based on its nonlinear mapping function can fit the relationship between strength and pore structure more accurate than an empirical formula.

Effect of Super Slag Powder on Pore Structure and Compressive Strength of RPC

2010 ◽  
Vol 150-151 ◽  
pp. 1214-1219
Author(s):  
Ping Zhang ◽  
Qiu Yi Li ◽  
Tie Jun Zhao ◽  
Xiang Xin Xue
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Specific Surface ◽  
Pore Structure ◽  
Mercury Intrusion Porosimetry ◽  
Mercury Intrusion ◽  
Slag Powder ◽  
Binder Ratio ◽  
The Relationship ◽  
Water Binder Ratio

This paper deals with RPC produced by superfine slag powder(measured specific surface area is 1824 m2/kg) and natural sands with a low water-binder ratio(0.2 or so),which strength can achieve 100MPa after 28d standand curing. An analysis,based on the mercury intrusion porosimetry,is made of the relationship between strength and pore structure parameters.The results show that the strength can be improved in the range of 30～45%, when the dosage of superfine slag powder varied from 5% to 15%；the linearity between compressive strength,water-binder ratio and the hole with a daimetre larger than 100nm are 0.72 and 0.92 respectively;and the RPC’s 28-day compressive strength produced by the natural sands, with a maximum grain size of 4.75 mm,is almost equal to the RPC produced by standard sands.

The Influence of Pore-Strucrure on the Campressive Strength of Hardened Cement Paste

1984 ◽  
Vol 42 ◽  
Author(s):  
Huang Yiun-Yuan ◽  
Ding Wei ◽  
Lu Ping
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Pore Structure ◽  
Cement Paste ◽  
Total Porosity ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
New Information ◽  
The Relationship ◽  
Empirical Constants

AbstractThe pore-structure strongly influences the carpressive strength of hardened cement paste (hcp) and other porous materials, as well as other mechanical properties. The simplest but most currently used expression representing the relationship between the pore-structure and compressive strength is fram Balshin: σ = σ0 (l-P)A, in which only the total porosity P is involved as a single parameter and σ0 and A are empirical constants. The influence of pore size distribution and pore shapes etc. are not considered.The authors introduce second parameter w - the factor of relative specific surface area of the pores other than the total porosity P into consideration and a new expression is proposed:σc=K11-p/1+2p(K2(1-p))K3w+K4 all the constants K1 - K4 can be determined experimentally. By using of this expression the new information relating the influence of pore-structure on the caopressive strength of hcp can be predicted.

scholarly journals Mechanical and Electroconductivity Properties of Graphite Tailings Concrete

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Hongbo Liu ◽  
Ben Li ◽  
Jing Xue ◽  
Jiayu Hu ◽  
Jing Zhang
Keyword(s):  
Compressive Strength ◽  
Electrical Resistivity ◽  
Material Properties ◽  
Theoretical Basis ◽  
Building Materials ◽  
Correlation Method ◽  
Intelligent Building ◽  
New Model ◽  
Grey Correlation ◽  
The Relationship

This paper investigated the mechanical and electroconductivity properties of graphite tailings concrete, in which the graphite tailings are replaced as sand. The results showed that the concentration of graphite tailings has an important influence on the mechanical, electroconductivity, and material properties of concrete. Finally, a new model for calculating the relationship between compressive strength and electrical resistivity based on the grey correlation method was obtained for providing a theoretical basis for building green and intelligent building materials.

scholarly journals Relationship between the Shear Strength and Microscopic Pore Parameters of Saline Soil with Different Freeze-Thaw Cycles and Salinities

Symmetry ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 1709
Author(s):  
Jiaqi Wang ◽  
Qing Wang ◽  
Sen Lin ◽  
Yan Han ◽  
Shukai Cheng ◽  
...  
Keyword(s):  
Shear Strength ◽  
Pore Structure ◽  
Pore Diameter ◽  
Saline Soil ◽  
Soil Samples ◽  
Average Pore Diameter ◽  
Failure Strength ◽  
Average Pore ◽  
Freeze Thaw ◽  
The Relationship

Saline soil is a widely distributed special soil with poor engineering properties. In seasonally frozen regions, the poor properties of saline soil will cause many types of engineering damage such as road boiling, melt sinking, and subgrade instability. These engineering failures are closely related to the shear strength of saline soil. However, there are relatively few studies on saline soil in cold regions. The strength of the soil is always determined by its microstructure; therefore, the study aims to investigate the relationship between the shear strength and microscopic pore structure of saline soil with different freeze–thaw cycles and salinities. The shear strength characteristics of saline soil with different salinities subjected to different freeze–thaw cycles were obtained by triaxial tests. In addition, the microstructure of the soil samples was investigated by scanning electron microscopy (SEM) tests, and the microscopic pore parameters of the soil samples, including porosity (N), average pore diameter (D¯), average shape coefficient (K), surface fluctuation fractal dimension (F), and orienting probability entropy (Hm), were obtained by image processing software quantitatively. Based on the experimental results, the influence of freeze–thaw cycles and salinity on the shear strength characteristics and microstructure of the soil samples were analyzed. Besides that, in order to effectively eliminate the collinearity between independent variables and obtain a stable and reasonable regression model, principal component regression (PCR) analysis was adopted to establish the relationship between the microscopic pore parameters and the failure strength of the soil samples. The fitting results demonstrated that the failure strength of saline soil is mainly related to the size and direction of the pores in the soil, and it has little correlation with pore shape. The failure strength of the soil was negatively correlated with the average pore diameter (D¯) and porosity (N), and it was positively correlated with the orienting probability entropy of the pores (Hm). This study may provide a quantitative basis for explaining the variation mechanism of the mechanical properties of saline soil from a microscopic perspective and provide references for the symmetry between the changes of the macroscopic properties and microscopic pore structure of the saline soil in cold regions.

Property Optimization of Inorganic Silicon Aluminum Polymer Based on Quadratic Regression and Orthogonal Design

2014 ◽  
Vol 629-630 ◽  
pp. 510-517
Author(s):  
Xiao Ma ◽  
Qiu Hua Rao
Keyword(s):  
Mathematical Model ◽  
Compressive Strength ◽  
Fly Ash ◽  
Performance Optimization ◽  
Orthogonal Design ◽  
Hydration Products ◽  
Quadratic Regression ◽  
Optimal Plan ◽  
Maximum Value ◽  
The Relationship

Because of the dosage of metakaolin and ash fly had a big impact on the performance optimization of inorganic silicon aluminum polymer, using of metakaolin and ash fly can optimize the pore structure and hydration products of inorganic silicon aluminum polymer paste, how to determine the dosage of metakaolin and ash fly of inorganic silicon aluminum polymer reasonably and directly has become a problem in this research needed to be resolved instantly at hand. The current study investigated the relationship between the amounts of metakaolin and fly ash added and the compressive strength of the inorganic silicon aluminum polymer paste, and then established relevant mathematical model using a quadratic regression quadrature combination design. Previous studies have shown that the addition of 13.56% metakaolin and 3% fly ash would be the optimal plan, and that 57.4 MPa would be the maximum value of the compressive strength of the cement paste of inorganic silicon aluminum polymer that could be obtained. Keywords: Inorganic silicon aluminum polymer; Property Optimization; Quadratic Regression and Orthogonal Design

scholarly journals Mathematical modelling of crushed rock dust concrete: Performance using compressive strength

2021 ◽  
Vol 1197 (1) ◽  
pp. 012071
Author(s):  
V. Bhavana ◽  
N. Venkata Sairam Kumar
Keyword(s):  
Mathematical Model ◽  
Compressive Strength ◽  
Specimen Size ◽  
Crushed Rock ◽  
Mathematical Equation ◽  
Binder Ratio ◽  
Cement Strength ◽  
And Control ◽  
Water To Binder Ratio ◽  
The Relationship

Abstract The paper gives out a mathematical model developed using linear regression statistical method to envisage the 28-day strength of CRD concrete, considering M20, M30 and M40 grades concrete and CRD replacement percentages of 0%, 10%, 20%, 30% and 40% by weight of cement. Strength results of M40, M30 and M20 grades concrete are used to develop the relationship between CRD content and compressive strength. The ratios of compressive strengths between CRD and control concrete (CC) have been related to CRD replacement percentage. The expression, derived is with strength ratios and not with experimental strength values. The mathematical equation developed is independent of the specimen parameters and may be applicable to all types of specimens. The model is considered as it involves non-dimensional variables and is independent of the specimen size, water to binder ratio (w/b) and grade of concrete.

scholarly journals Mechanical Properties and Micro Structure of Cement Concrete in Freeze-Thaw Environment

2021 ◽  
Vol 233 ◽  
pp. 01011
Author(s):  
Xin jian Lv ◽  
Lei Yu ◽  
Ming ming Chai
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Pore Structure ◽  
Fresh Water ◽  
Pore Diameter ◽  
Dynamic Elastic Modulus ◽  
Freeze Thaw ◽  
Salty Water ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

In order to find the declay law of mechanical property and the performance difference after salty water and fresh water freeze-thaw cycle, freeze-thaw cycle environments under the salty water and fresh water are simulated. The compressive strength, dynamic elastic modulus and the mass lost are tested. The pore structure parameters are also tested by MIP. Plot the pore diameter distribution curve. The result shows that the compressive strength and dynamic elastic modulus are all decreased. The degree of these two properties decreasing under salty water freeze and thaw recycle is more than the one under fresh water. The parameters of porosity and critical pore diameter become larger. The amount of pores whose diameter is between 100nm and 1000nm increase. The amount of pores whose diameter is under 100nm decrease. The deteriorate degree of pore structure is deeper in salty water than in fresh water.

Nuclear pore structure in quiescent buds of Tilia europaea

1980 ◽  
Vol 58 (16) ◽  
pp. 1814-1819 ◽  
Author(s):  
J. H. M. Willison ◽  
F. J. Cragg
Keyword(s):  
Electron Microscopy ◽  
Pore Structure ◽  
Pore Diameter ◽  
Nuclear Pore ◽  
Nuclear Pores ◽  
The Relationship

Quiescent shoot apical tissue from buds of the linden tree (Tilia europaea L.), collected during winter months, was frozen without pretreatment and freeze-fractured for electron microscopy. A proportion of the nuclear envelopes bore unusually large nuclear pores, having diameters up to 175 nm. Results from cross-fractured nuclear envelopes were consistent with results from envelopes fractured in the membrane plane, indicating that the larger pores are unlikely to be artefacts of fracturing. In these large pores, it was not possible to determine the relationship between the annulus (the material contained within the membranous pore) and the membranous periphery of the pore. Particularly, it could not be determined whether the annulus expanded concomitantly with the pore. It is proposed that variations in nuclear pore diameter may arise as a result of pulsatory activity occurring in all pores, rather than representing static differences between individual pores.

Sign in / Sign up

Export Citation Format

Share Document