Pozzolanic activity of burned coal gangue and its effects on structure of cement mortar

2006 ◽  
Vol 21 (4) ◽  
pp. 150-153 ◽  
Author(s):  
Zhang Changsen
Keyword(s):  
Cement Mortar ◽  
Coal Gangue ◽  
Pozzolanic Activity

Preparation of Coal Gangue Cement Mortar

2013 ◽  
Vol 684 ◽  
pp. 159-162
Author(s):  
Wen Xia Li ◽  
Dong Li Wang ◽  
Ji Shou Niu ◽  
Xian Wei Ma
Keyword(s):  
Cement Mortar ◽  
Methyl Cellulose ◽  
Coal Gangue ◽  
Cellulose Ether ◽  
Low Strength

Many researches on coal gangue are aimed at increasing its activity by many methods together such as thermal, mechanical and chemical. The methods are so complex that they are difficult to be adopted by some companies. In this paper, considering the low-strength requirement of cement mortar, the activity of coal gangue is more evidently shown by Ca(OH)2 activator. The 28-days strength of coal gangue cement mortar can reach 18MPa and the hydrated mortar shows and keeps an expansive behavior by adding methyl cellulose ether and CaSO4•2H2O at all the ages.

Assessment of pozzolanic activity of thermally activated clay and its impact on strength development in cement mortar

RSC Advances ◽  
2015 ◽  
Vol 5 (8) ◽  
pp. 6079-6084 ◽  
Author(s):  
Noor-ul- Amin ◽  
Sultan Alam ◽  
Saeed gul
Keyword(s):  
Cement Mortar ◽  
Pozzolanic Activity ◽  
Strength Development ◽  
Thermally Activated ◽  
Different Temperatures ◽  
Kaolinitic Clay

Natural kaolinitic clay from Khyber Pakhtoonkhwa, Pakistan was thermally activated at different temperatures and its pozzolanic behavior was studied.

Recycling MSTP Sludge as an Admixture in Concrete

2013 ◽  
Vol 785-786 ◽  
pp. 308-316
Author(s):  
Liu Lei Lu ◽  
Dong Ouyang ◽  
Xi Lian Wen ◽  
Guan Cheng Liang
Keyword(s):  
Portland Cement ◽  
Cement Mortar ◽  
Waste Product ◽  
Blended Cement ◽  
Plain Concrete ◽  
Pozzolanic Activity ◽  
Municipal Sewage ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Activation Conditions

One of the main objectives of this study was to activate the pozzolanic activity of sludge, produced by municipal sewage treatment plants (MSTP), make it become an admixture to replace a part of cement in concrete. Nowadays, a significant quantity of MSTP sludge is obtained in China. That is why this paper examines the possibility of adding this waste product to plain concrete with Portland cement. Preliminary studies are carried out on using MSTP sludge as an admixture by thermal (calcining) and mechanical (grinding) treatment. The pozzolanic activity of the calcined sludge ash (CSA) evaluated by Cement Mortar test. The CSA-blended cement concrete was formed into specimens of cubic concrete with 100 mm×100 mm×100 mm. They are with 30 wt. % cement replaced by CSA, which was prepared by the optimal activation conditions. The Cement Mortar test results revealed that the optimal activation conditions of CSA were as follows: calcined at 800°C for 2.5 hours followed by fast cooling in air and then ground until 60 minutes. Besides, the compressive strengths of concrete specimens with added 30% CSA were 103.6% and 105.3% of those of the ordinary Portland cement concrete specimens at 7 and 28 days, respectively. These results demonstrate the feasibility of recycling MSTP sludge as an admixture in concrete for construction engineering.

scholarly journals Correction: Assessment of pozzolanic activity of thermally activated clay and its impact on strength development in cement mortar

RSC Advances ◽  
2015 ◽  
Vol 5 (14) ◽  
pp. 10680-10680 ◽  
Author(s):  
Noor-ul- Amin ◽  
Sultan Alam ◽  
Saeed Gul
Keyword(s):  
Cement Mortar ◽  
Pozzolanic Activity ◽  
Strength Development ◽  
Thermally Activated

Correction for ‘Assessment of pozzolanic activity of thermally activated clay and its impact on strength development in cement mortar’ by Noor-ul- Amin et al., RSC Adv., 2015, 5, 6079–6084.

Compressive Strength of Cement Mortar Using Sebha Clay, Treated by Sonication Method

2013 ◽  
Vol 377 ◽  
pp. 60-68
Author(s):  
Mohamed Aboubakar ◽  
Eshmaiel Ganjian ◽  
Homayoon Sadeghi-Pouya ◽  
A.M. Akash ◽  
Mircea Vinatoru
Keyword(s):  
Particle Size ◽  
Portland Cement ◽  
Cement Mortar ◽  
Chemical Properties ◽  
Pozzolanic Activity ◽  
Mineral Admixture ◽  
Partial Replacement ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Clay as natural pozzolan is found in the north of the city of Sebha, Libya. Sebha clay is relatively high in silica, and its physical and chemical properties could be referred to as ASTM C618 class N. Sonication treatment is carried out and the treated Sebha clay is used as a mineral admixture in the Portland cement mortar. Horn method 20 kHz frequencies with different powers and different times are used in the Sonication treated. The particle size distributions (PSD) and Scanning Electron Microscope (SEM) imaging are used to understand the mechanism of pozzolanic improvement of the Sebha clay after treatment by sonication. This paper shows the physical and chemical properties of sonication treat Sebha clay. The effect of magnitude of sonic power on pozzolanic activity of treated kaolin is investigated. The main aim of the present research is to study the strength characteristics of cement mortar using Sebha natural clay after sonication is treated as a partial replacement of ordinary Portland cement OPC. The parameters are investigated, including compressive strengths .The results show enhancement in particle size and pozzolanic activity of treated kaolin, with increase in sonic power and in the time.

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