Form and mechanism of sulfate attack on cement-based material made of limestone powder at low water-binder ratio under low temperature conditions

2012 ◽  
Vol 27 (3) ◽  
pp. 581-585 ◽  
Author(s):  
Juanhong Liu ◽  
Shaomin Song ◽  
Guoqiang Xu ◽  
Weiguo Xu
Keyword(s):  
Low Temperature ◽  
Sulfate Attack ◽  
Limestone Powder ◽  
Temperature Conditions ◽  
Binder Ratio ◽  
Water Binder Ratio

Properties of Concrete with High-Volume Limestone Powder under Low Temperature Conditions

2013 ◽  
Vol 675 ◽  
pp. 296-301
Author(s):  
Shao Min Song ◽  
Wen Zhong Bao ◽  
Wen Xin Zhao ◽  
Dong Min Jin
Keyword(s):  
Fly Ash ◽  
Low Temperature ◽  
High Volume ◽  
Sulfate Solution ◽  
Active Role ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Strength Development ◽  
Binder Ratio ◽  
Water Binder Ratio

This paper studies the effects of high-volume composite mineral admixture made of limestone powder and low-quality fly ash on the properties of concrete,and studies the form of attack of cement-based material made of limestone powder at low water-binder ratio under low-temperature sulfate environment.Through experiments, this paper makes clear the workability of fresh concrete and analyzes the law of strength development of concrete. The experimental results indicate that the concrete with high-volume limestone powder as composite mineral admixture has good fresh properties; due to low water consumption per unit volume, medium-and-high-strength concrete can be prepared. As new type concrete mineral admixture, the composite mineral admixture made of limestone powder and low-quality fly ash will play an active role in the sustainable development of concrete industry. After the specimen with the water-binder ratio of less than 0.4 and the limestone powder volume of greater than 20% is soaked in 10% magnesium sulfate solution at low temperature at the age of 200d, gypsum attack-led destruction is caused to the concrete test cube, without thaumasite sulfate attack.

Deterioration of Cement Pastes Containing Limestone Powder with Different Fineness Exposed to Sulfate Environment at Low Temperature

2013 ◽  
Vol 423-426 ◽  
pp. 1076-1080
Author(s):  
Feng Chen Zhang ◽  
Ruo Yu Tang ◽  
Yun Zhao
Keyword(s):  
Fourier Transform ◽  
Low Temperature ◽  
Sulfate Attack ◽  
Limestone Powder ◽  
Test Results ◽  
X Ray Diffraction ◽  
Limestone Filler ◽  
Cement Pastes ◽  
Cement Production ◽  
X Ray

Limestone filler and aggregates are used widely in cement production and concrete mixing nowadays, which could be connected with thaumasite formation, and lead to a lack of durability further in sulfate environment. This work deals with the deterioration of cement pastes containing 35% w/w limestone powder with different fineness immersed in MgSO4 solution at 5°C±2°C for 15 weeks by. Erosion phases are discussed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). Test results show that visual deterioration of three kinds of cement pastes containing 400-mesh, 800-mesh and 1250-mesh limestone powders has little distinction, and erosion phases are all compound of ettringite, thaumasite, gypsum and brucite. Limestone powders with fineness of 400-mesh could supply enough carbonate needed for thaumastie formation. Increase of limestone fineness further could not accelerate deterioration of cement paste during the external magnesium sulfate attack at low temperature.

Sulfate and Frost Resistance of Mass Hydraulic Concrete

2006 ◽  
Vol 302-303 ◽  
pp. 191-196
Author(s):  
Pei Wei Gao ◽  
Sheng Xing Wu ◽  
Ping Hua Lin ◽  
Zhong Ru Wu ◽  
Ming Shu Tang
Keyword(s):  
Fly Ash ◽  
Frost Resistance ◽  
Sulfate Attack ◽  
Sulfate Resistance ◽  
Expansive Agent ◽  
Hydraulic Concrete ◽  
Binder Ratio ◽  
Water Binder Ratio

This paper discusses the sulfate resistance and frost of mass hydraulic concrete which containing fly ash, superplasticizer and a novel MgO-bearing expansive agent (HNM), at same time, the mechanisms and processes of sulfate attack on it have been proposed. Results showed that using a water/binder ratio of 0.48 in RCC containing 50 % fly ash and 8 % HNM a durability factor of over D300 can be achieved and sulfate resistance may be improved slightly.

Chlorine Ion Penetration Resistance of Concretes Containing Super-Fine Limestone Powder

2012 ◽  
Vol 512-515 ◽  
pp. 2961-2964
Author(s):  
Hong Fang Li ◽  
Yi Xia
Keyword(s):  
Penetration Resistance ◽  
Limestone Powder ◽  
Curing Time ◽  
Key Factor ◽  
Binder Ratio ◽  
Chlorine Ion ◽  
Penetration Tests ◽  
Water Binder Ratio ◽  
Ion Penetration

The influence of limestone powder, air-entraining agent and water binder ratio on chlorine ion (Cl-) penetration resistance of concretes was investigated by rapid Cl- penetration tests. The results show that the fineness of limestone powder is a key factor to Cl- penetration resistance of concrete. It can improve Cl- penetration resistance by introducing super fine limestone powder into concrete. Cl- penetration resistance of concrete increases as curing time increases. The concrete with lower water binder ratio has better Cl- penetration resistance. The introduction of air-entraining agent into concrete can enhance Cl- penetration resistance by improving micro pores structure. The optimum mixing amount is 0.3‰.

Performance of Compound Cementitious Material Compounded with Clinker and Limestone Powder and Coal Ash

2011 ◽  
Vol 477 ◽  
pp. 142-147
Author(s):  
Tian Yong Huang ◽  
Yun Fen Hou
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Coal Ash ◽  
Cementitious Material ◽  
Limestone Powder ◽  
Mortar Strength ◽  
Cleavage Strength ◽  
Binder Ratio ◽  
Water Amount ◽  
Water Binder Ratio

Limestone powder and coal ash are selected to prepare compound cementitious material with clinker. It is found that with the increasing of mixture (including limestone powder and coal ash), the water amount for standard consistency of compound cementitious material increases and the flexural strength and compressive strength at 3 and 28 days decrease. Increasing of limestone powder can reduces the water amount for standard consistency. The compressive strength, flexural strength and cleavage strength decrease with the increasing of mixture. If the mixture dosage is 60%, when the ratio of limestone powder and coal ash is 8:2, the compressive strength is the highest. If the mixture dosage increases to 70%, when the ratio of limestone powder and coal ash is 7:3, the compressive strength is the highest. If the mixture dosage is 80%, the all strengths are very low. The compressive strength increases significantly with time, the compressive strength is greater than 50MPa at 90 days. Although the mortar strength of compound cementitious material is far below for mortar strength required by cement standard, but the middle-low strength grade concrete can be prepared by low water-binder ratio.

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