Characteristics of alkali–silica reaction according to substitution ratios of limestone powder in cement mortar

2015 ◽  
Vol 19 (sup8) ◽  
pp. S8-474-S8-478
Author(s):  
S. Kim ◽  
C. Park ◽  
K.-K. Yun ◽  
E. Choi
Keyword(s):  
Cement Mortar ◽  
Limestone Powder ◽  
Alkali Silica Reaction

scholarly journals Properties of Cement Mortar Using Limestone Sludge Powder Modified with Recycled Acetic Acid

2019 ◽  
Vol 11 (3) ◽  
pp. 879
Author(s):  
Hwa-Sung Ryu ◽  
Deuck-Mo Kim ◽  
Sang-Heon Shin ◽  
Wan-Ki Kim ◽  
Seung-Min Lim ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Cement Mortar ◽  
Surface Characteristics ◽  
Calcium Acetate ◽  
Raw Material ◽  
Limestone Powder ◽  
Low Carbon ◽  
Pore Filling ◽  
Initial Strength

One of the various methods of manufacturing low-carbon cement is substituting limestone powder as a raw material or admixture. Limestone sludge powder (LSSP) has the same composition as that of limestone powder. The surface characteristics of LSSP powder modified with recycled acetic acid (RAA) and the characteristics of cement using this modified LSSP as a substitute were investigated in this study. The surface of LSSP modified with RAA was converted into calcium acetate and had a large grain size. When conventional LSSP was used as a substitute for cement, the initial strength increased owing to improved pore filling; however, the strength after 28 days of aging was lower than that of non-substituted cement. In the case of modified LSSP being replaced with cement at up to 10% of the cement weight, however, the calcium acetate on its surface increased the amount of hydration products in the cement, thereby increasing both the initial and the long-term strength.

Effect of Nanoclay on the Expansive Potential of Cement Mortar due to Alkali-Silica Reaction

2015 ◽  
Vol 112 (6) ◽  
Author(s):  
Mohammad R. Irshidat ◽  
Mohammed H. Al-Saleh ◽  
Sura Sanad
Keyword(s):  
Cement Mortar ◽  
Alkali Silica Reaction

The Influence of Combined Admixture of Super-Fine Limestone Powder and Low-Quality Fly Ash on the Performance of Cement Mortar

2013 ◽  
Vol 652-654 ◽  
pp. 1181-1184
Author(s):  
Guo Qiang Xu ◽  
Zhi Guo You ◽  
Lin Gao ◽  
Dian Li Han
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Cement Mortar ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Test Results ◽  
Maximum Compressive Strength

The influence of admixture of super-fine limestone powder and low-quality fly ash in different proportions on the fluidity and strength of cement mortar is studied. The test results show that the mortar fluidity increases with the increase of the super-fine limestone powder (the mixing amount of fly ash reduces), and the strength of cement mortar can improve when limestone powder and low-quality fly ash are combined admixed to a certain ratio. The maximum flexural strength of the 28d mortar is 9.8MPa and its maximum compressive strength is 42.2MPa, and at this time, the limestone powder accounts for 33.3% of the mineral admixtures. However, when the mixing amount of super-fine limestone powder is over a certain range, the strength of 28d cement mortar will reduce.

Using of the Ultrasonic Method for Alkali-Silica Reaction Detection in the Cement Mortar

2021 ◽  
Vol 321 ◽  
pp. 29-35
Author(s):  
Dimitrii Gusak ◽  
Jiří Brožovský ◽  
Rudolf Hela
Keyword(s):  
Internal Structure ◽  
Propagation Velocity ◽  
Cement Mortar ◽  
Ultrasonic Method ◽  
Alkali Silica Reaction ◽  
Extensive Investigation ◽  
Internal Corrosion ◽  
Impulse Propagation ◽  
Structure Changes

The alkali–silica reaction (ASR) causes internal corrosion of concrete. The aim of this work is to verify the possibility of ultrasonic method in detection of concrete internal structure changes, which were initiated by the alkali-silica reaction. For this purpose, we prepared samples that contained aggregates of two types, namely one with 98% of SiO2 content and one with a greywacke. The dependence of ultrasonic impulse propagation velocity on the changes in the structure of mortars containing aggregates from these rocks was researched. The results of this work are not unambiguous yet and therefore it is necessary to carry out more extensive investigation with using of other methods that will allow to examine changes in the internal structure of composites more detailed.

scholarly journals IMPROVING THE VOLUMETRIC STABILITY OF WHITE CEMENT BY USING SOME ADDITIVES

2021 ◽  
Vol 25 (Special) ◽  
pp. 2-65-2-71
Author(s):  
Marwa A. Anber ◽  
◽  
Mohammed A. Abdulrehman ◽  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Polyvinyl Alcohol ◽  
Cement Mortar ◽  
Physical And Mechanical Properties ◽  
Drying Shrinkage ◽  
Limestone Powder ◽  
Mixing Ratio ◽  
White Cement ◽  
Dry Shrinkage

Abstract: This study looked at the effects of three types of additives: limestone powder, Arabian gum AG, and polyvinyl alcohol (PVA), on White Cement Mortar's Physical and Mechanical Properties the mixing ratio for dry shrinkage was 1:2. (Cement: sand) while for other tests, it was 1:2.75 (cement: sand). The limestone powder proportions are (5%, 10%, and 15%) by weight of white cement, while the AG ratios are (0.2, 0.5, and 0.8) % by weight of white cement, the polyvinyl alcohol ratios are (2%, 4%, and 6%). This study was focused at the compressive and flexural strength of the modified mortar, as well as water absorption and drying shrinkage. According to the findings, utilizing of limestone powder as additive in white cement mortar is not advised. Since it had the negative affect on dry shrinkage of the mortar. Furthermore, polymer additives such as AG and PVA significantly increase the reduction of ability of forming crack in white cement mortar. Furthermore, the optimal additive percentages of AG and PVA are 0.5 percent and 6%, respectively.

Study on the Influence of Limestone Dust on Performance of Cement Mortar

2013 ◽  
Vol 368-370 ◽  
pp. 992-996
Author(s):  
Mei Yan Hang ◽  
Meng Gao ◽  
Ying Jing Lan
Keyword(s):  
Cement Mortar ◽  
Limestone Powder ◽  
Dust Particles ◽  
Inert Material ◽  
Limestone Dust ◽  
Shrinkage Property

This paper use dust particles which is produced by crushing limestone to replace the same amount of cement in different proportions, study the performance of cement mortar, and determine the best dosage of limestone dust. Its size is less than 0.08mm. The result shows that limestone dust has water-reduce effect and does not reduce the strength of the mortar when the dosage of limestone dust is less than 12%. Meanwhile the addition of limestone powder can improve the shrinkage property and the durability of sulfate. It explains that limestone dust has a certain activity, not the inert material.

scholarly journals Polymer action on alkali–silica reaction in cement mortar

2013 ◽  
Vol 44 ◽  
pp. 97-105 ◽  
Author(s):  
João Feiteira ◽  
Maria S. Ribeiro
Keyword(s):  
Cement Mortar ◽  
Alkali Silica Reaction
Sign in / Sign up

Export Citation Format

Share Document