Ultrafine Grinding of Limestone with Sodium Polyacrylates as Additives in Ordinary Portland Cement Mortar

2014 ◽  
Vol 37 (5) ◽  
pp. 787-794 ◽  
Author(s):  
Katja Ohenoja ◽  
Sandra Breitung-Faes ◽  
Päivö Kinnunen ◽  
Mirja Illikainen ◽  
Juha Saari ◽  
...  
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
Ultrafine Grinding

Effect of Delaying Addition of Heat Stimulated Superplasticizer on Fresh Properties of Mortar

2017 ◽  
Vol 890 ◽  
pp. 396-400 ◽  
Author(s):  
Zabihollah Tahery ◽  
Faraidoon Rahmanzai ◽  
Shigeyuki Date
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
Polycarboxylic Acid ◽  
Fresh Properties ◽  
External Temperature ◽  
Factors Affecting ◽  
Air Content ◽  
Heat Stimulation ◽  
Stimulation Of

To assure the quality and required workability of mortar or concrete, various types of superplasticizers are used. There are many factors affecting the performance of superplasticizers explicitly, type and dosage of the superplasticizers, type of cement, temperature and mixing procedure, as well as the addition times of the superplasticizers. Some researchers investigated the effect of delaying the addition time of superplasticizer to mortar or concrete, but there is not enough data about the effect of external temperature on performance of superplasticizers and consequent influences on fresh properties of mortar or concrete. In this research the effect of delaying the addition time of superplasticizers and influence of external temperature, namely, heat stimulation of superplasticizers, on fluidity, fresh density and air content of fresh cement mortar was investigated. Two types of Precast and Ready-Mix of Polycarboxylic acid-based ether superplasticizers with Ordinary Portland Cement was used. Delaying the addition time of superplasticizers enhanced the fluidity, slightly decreased the fresh density and increased the air content of mortar in comparison with simultaneous addition time with both heated and non-heated Superplasticizers.

scholarly journals Study the Characterizations of Cement Mortar by Nano Pozzolanic Materials Additions

2018 ◽  
Vol 13 (4) ◽  
pp. 152-163 ◽  
Author(s):  
Fadhil A. Rasin ◽  
Laith K. Abbas ◽  
Mohammed J. Kadhim
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
Nano Particles ◽  
Type I ◽  
Fine Aggregate ◽  
Nano Materials ◽  
Curing Time ◽  
Water To Cement Ratio ◽  
Nano Alumina

This study involves adding nano materials and interaction with cement mortar behavior for several mortar samples under variable curing time with constant water to cement ratio (W/C = 0.5). The effects of adding nano materials on the microstructure of cement mortar were studied by (Scanning Electronic Microscopy (SEM) and X-Ray (for samples at different curing time 28 and 91 days. Small ratio replacements of nano particles (SiO2 or Al2O3) were added to Ordinary Portland Cement (OPC) type (I). The percentage of nano materials additives replacement by weight of ordinary Portland cement includes (1, 2, 3, 4 and 5%) for both types of nano materials with constant (W/C) ratio, also the amount of the fine aggregate used was three times the amount of cement. The results showed that, the mortar consist of both nano materials had better microstructure than mortar without nano materials in all test. Best enhancements in properties and microstructure for mortars with nano silica were achieved with (3%) additives while were achieved with nano alumina at (2%) additives.

Effect of ZnO Nanoparticles on Cement Mortar for Enhancing the Physico-Chemical, Mechanical and Related Properties

2020 ◽  
Vol 12 (3) ◽  
pp. 348-355 ◽  
Author(s):  
Ramasamy Gopalakrishnan ◽  
Subramanian Nithiyanantham
Keyword(s):  
Mechanical Properties ◽  
Zinc Oxide ◽  
Portland Cement ◽  
Zinc Oxide Nanoparticles ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
Setting Time ◽  
Oxide Nanoparticles ◽  
Physico Chemical ◽  
Cement Mortars

Zincoxide nanoparticles have been incorporated into the cementitious materials for enhancing their physico-chemical and mechanical properties. The decrease in particle size will leads the increase in surface to volume ratio as compared to conventional micro-particles. In this investigation to evaluate physical, chemical and mechanical properties of Ordinary Portland Cement (OPC) containing zinc oxide nanoparticles. Zinc oxide nanoparticles used with replacement of various properties such as 0%, 1%, 2%, 3%, 4% and 5% by weight with ordinary Portland cement. The ordinary Portland cement mortar, nano zincoxide cement mortars prepared with the water-binder ratio (w/b ratio) as 0.4 and cement-sand ratio as 1:3 by weight. The prepared mortars are analyzed through compressive strength, setting time, flexural strength, porosity, water absorption, sulphate attack, electrical resistivity and with SEM analysis. The setting time of zinc oxide nano particle significantly decreased and enhanced the compressive strength of Portland cement mortar. The flexural strength outcomes showed that the cement mortars with zinc oxide nanoparticle were higher rather than Portland cement mortar. Microstructure of mortar contained zinc oxide nano particles illustrate that the nano zinc oxide particles filled the pores significantly and so large size of calcium hydroxide crystals reduced afterwards more hydration products formed.

scholarly journals Improvement in Carbonation Resistance of Portland Cement Mortar Incorporating γ-Dicalcium Silicate

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Zhengxin Chen ◽  
Yunsu Lee ◽  
Hyeongkyu Cho ◽  
Hanseung Lee ◽  
Seungmin Lim
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
Dilution Effect ◽  
Dicalcium Silicate ◽  
Accelerated Carbonation ◽  
Replacement Rate ◽  
Carbonation Depth ◽  
Carbonation Resistance ◽  
Water Curing

In this study, γ-dicalcium silicate (γ-C2S) was incorporated into ordinary Portland cement (OPC) to sequester CO2 to enhance the carbonation resistance of cement-based composite materials. γ-C2S can react with CO2 rapidly to form vaterite and high dense SiO2 gel which could block the pores off and then inhibit further diffusion of CO2 into the system. Cement mortar specimens containing 0%, 5%, 10%, 20%, and 40% γ-C2S as cement replacement were prepared. After water curing for 28 days followed by curing in an environmental chamber for 28 days, the specimens were then exposed to an accelerated carbonation with 5% CO2 concentration for 28 days. The carbonation depth of the cement mortar with a low replacement rate (5% and 10%) was lower than that of the OPC mortar at all ages due to the sequestration of CO2 by γ-C2S. However, the cement mortar with a high replacement rate (20% and 40%) showed less carbonation resistance due to the dilution effect of γ-C2S replacement and increase in initial porosity caused by nonhydraulic characteristic of γ-C2S.

Research on Nitric Acid Corrosion Resistance of Latex Modified Ordinary Portland Cement Mortar

2012 ◽  
Vol 485 ◽  
pp. 262-265
Author(s):  
Wei Dong Hua ◽  
Hong Yi Jiang ◽  
Zi Xia Zhou
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
Nitric Acid ◽  
Flexural Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
Acid Corrosion ◽  
Cement Ratio ◽  
Acrylic Latex

The relationship between the ratio of styrene-acrylic latex to ordinary Portland cement (OPC) and the nitric acid corrosion resistance of latex modified ordinary Portland cement mortar was studied. The compressive strength and flexural strength of latex modified cement mortar in the nitric acid solution at different ages were tesed and the samples appearance was observed. The results show that the nitric acid corrosion resistance of latex modified OPC mortar is influenced positively by the latex/cement ratio. With the ratio of emulsion to cement increasing, the nitric acid corrosion resistance ability of OPC mortar was enhanced firstly and then decreased. When the polymer/cement ratio was 0.2, the latex modified cement mortar showed the best performance in compressive strength, flexural strength, and the appearance.

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