Sustainable Performance of Limestone Cement

2012 ◽  
Vol 476-478 ◽  
pp. 1692-1696 ◽  
Author(s):  
Chun Tao Chen ◽  
Jiang Jhy Chang ◽  
Wei Chung Yeih ◽  
Shun Ting Chang
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Sulfate Attack ◽  
Portland Cements ◽  
Sustainable Performance ◽  
Limestone Cement

This study explores the effects of the limestone addition on the mechanical properties and durability of the cement. Portions of the Portland cements were replaced by the limestone powders. Results showed that the compressive strengths of the mortar were reduced by the limestone addition. In general, the addition of limestone helps to reduce the shrinkage and improve the sulfate attack resistance. The lowest sulfate-expansion occurred at the specimens with a limestone addition of 10%. Moreover, with additions of 10% or less, the reductions in strength were likely recovered by the addition of fly ash.

Effects of fly ash on Portland limestone cement under sulfate attack at low temperature

2020 ◽  
Vol 72 (3) ◽  
pp. 134-148 ◽  
Author(s):  
Meng Wu ◽  
Yunsheng Zhang ◽  
Yongsheng Ji ◽  
Guojian Liu ◽  
Wei She ◽  
...  
Keyword(s):  
Fly Ash ◽  
Low Temperature ◽  
Sulfate Attack ◽  
Portland Limestone Cement ◽  
Limestone Cement

scholarly journals Assessment of Mechanical Properties and Damage of High Performance Concrete Subjected to Magnesium Sulfate Environment

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Sheng Cang ◽  
Xiaoli Ge ◽  
Yanlin Bao
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Magnesium Sulfate ◽  
Damage Evolution ◽  
High Performance ◽  
Damage Mechanics ◽  
High Performance Concrete ◽  
Pulse Velocity ◽  
Sulfate Attack ◽  
Exponential Fitting

Sulfate attack is one of the most important problems affecting concrete structures, especially magnesium sulfate attack. This paper presents an investigation on the mechanical properties and damage evolution of high performance concrete (HPC) with different contents of fly ash exposure to magnesium sulfate environment. The microstructure, porosity, mass loss, dimensional variation, compressive strength, and splitting tensile strength of HPC were investigated at various erosion times up to 392 days. The ultrasonic pulse velocity (UPV) propagation in HPC at different erosion time was determined by using ultrasonic testing technique. A relationship between damage and UPV of HPC was derived according to damage mechanics, and a correlation between the damage of HPC and erosion time was obtained eventually. The results indicated that (1) the average increasing amplitude of porosity for HPCs was 34.01% before and after exposure to magnesium sulfate solution; (2) the damage evolution of HPCs under sulfate attack could be described by an exponential fitting; (3) HPC containing 20% fly ash had the strongest resistance to magnesium sulfate attack.

scholarly journals Mechanical Properties and Damage Evolution of Concrete Materials Considering Sulfate Attack

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2343
Author(s):  
Qianyun Wu ◽  
Qinyong Ma ◽  
Xianwen Huang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Damage Evolution ◽  
Resistance Coefficient ◽  
Sulfate Attack ◽  
Micro Structure ◽  
Micro Cracks ◽  
Concrete Damage ◽  
Concrete Materials

In order to study the durability of concrete materials subjected to sulfate attack, in a sulfate attack environment, a series of concrete tests considering different fly ash contents and erosion times were conducted. The mechanical properties and the micro-structure of concrete under sulfate attack were studied based on the following: uniaxial compressive strength test, split tensile test, ultrasonic impulse method, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The mechanical properties were compressive strength, splitting tensile strength, and relative dynamic elastic modulus, respectively. Additionally, according to the damage mechanical theory, experimental results and micro-structure analysis, the damage evolution process of concrete under a sulfate attack environment were studied in detail. Finally, according to the sulfate attack time and fly ash content, a damage model of the sulfate attack of the binary surface was established. The specific results are as follows: under the action of sulfate attack, the change law of the rate of mass change, relative dynamic modulus of elasticity, corrosion resistance coefficient of compressive strength, and the corrosion resistance coefficient of the splitting tensile strength of concrete all increase first and then decrease. Under the same erosion time, concrete mixed with 10% fly ash content has the best sulfate resistance. Through data regression, the damage evolution equation of the sulfate attack was developed and there is an exponential function relationship among the different damage variables. The binary curved surface regression effect of the concrete damage and the erosion time and the amount of fly ash is significant, which can predict deterioration of concrete damage under sulfate attack. During the erosion time, the combined expansion of ettringite and gypsum caused micro cracks. With an increase of corrosion time, micro cracks developed and their numbers increased.

Selected Properties of Cementitous Composites with Portland Cements and Blended Portland Cements in Extreme Conditions

2014 ◽  
Vol 507 ◽  
pp. 443-448 ◽  
Author(s):  
Lenka Bodnárová ◽  
Tomáš Jarolím ◽  
Jaroslav Válek ◽  
Jiří Brožovský ◽  
Rudolf Hela
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elasticity Modulus ◽  
Ultrasonic Pulse ◽  
Hardened Concrete ◽  
Extreme Conditions ◽  
Portland Cements ◽  
Portland Limestone Cement ◽  
Velocity Of Propagation ◽  
Limestone Cement

The paper is focused on research of physico-mechanical properties of concretes with Portland-limestone cement, Blastfurnace cement and Portland-composite cement in comparisom with concrete with Portland Cement CEM I. Following physico-mechanical properties of concretes exposed to extreme conditions were tested: compressive strength, flexural strength, tensille splitting strength, velocity of propagation of ultrasonic pulse, dynamic elasticity modulus and density of hardened concrete. Following environments were used in tests: sulphates, magnesic ions, nitrates, gaseous CO2, high temperatures.

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