Measurement and Prediction of Heat of Hydration of Portland Cement Using Isothermal Conduction Calorimetry

2013 ◽  
Vol 41 (6) ◽  
pp. 20120272 ◽  
Author(s):  
Ahmadreza Sedaghat ◽  
A. Zayed ◽  
Paul Sandberg
Keyword(s):  
Portland Cement ◽  
Heat Of Hydration ◽  
Conduction Calorimetry

Heat of hydration of Portland Cement–Metakaolin–Fly ash (PC–MK–PFA) blends

2008 ◽  
Vol 38 (6) ◽  
pp. 832-840 ◽  
Author(s):  
David G. Snelson ◽  
Stan Wild ◽  
Martin O'Farrell
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Heat Of Hydration

scholarly journals Hydration and Microwave Curing Temperature Interactions of Repair Mortars

2021 ◽  
Vol 03 (04) ◽  
pp. 1-1
Author(s):  
Pal S. Mangat ◽  
◽  
Shahriar Abubakri ◽  
Konstantinos Grigoriadis ◽  
Vincenzo Starinieri ◽  
...  
Keyword(s):  
Portland Cement ◽  
Heat Of Hydration ◽  
Curing Temperature ◽  
Early Age ◽  
Normal Density ◽  
Concrete Repair ◽  
Microwave Curing ◽  
Polymer Addition ◽  
Curing Period ◽  
Repair Materials

Microwave curing of repair patches provides an energy efficient technique for rapid concrete repair. It has serious economic potential due to time and energy saving especially for repairs in cold weather which can cause work stoppages. However, the high temperatures resulting from the combination of microwave exposure and accelerated hydration of cementitious repair materials need to be investigated to prevent potential durability problems in concrete patch repairs. This paper investigates the time and magnitude of the peak hydration temperature during microwave curing (MC) of six cement based concrete repair materials and a CEM II mortar. Repair material specimens were microwave cured to a surface temperature of 40-45 °C while their internal and surface temperatures were monitored. Their internal temperature was further monitored up to 24 hours in order to determine the effect of microwave curing on the heat of hydration. The results show that a short period of early age microwave curing increases the hydration temperature and brings forward the peak heat of hydration time relative to the control specimens which are continuously exposed to ambient conditions (20 °C, 60% RH). The peak heat of hydration of normal density, rapid hardening Portland cement based repair materials with either pfa or polymer addition almost merges with the end of microwave curing period. Similarly, lightweight polymer modified repair materials also develop heat of hydration rapidly which almost merges with the end of microwave curing period. The peak heat of hydration of normal density ordinary Portland cement based repair materials, with and without polymer addition, occurs during the post microwave curing period. The sum of the microwave curing and heat of hydration temperatures can easily exceed the limit of about 70 °C in some materials at very early age, which can cause durability problems.

scholarly journals Influence of Amount of Calcareous Fly Ash on Heat of Hydration of Portland Cement

2019 ◽  
Vol 603 ◽  
pp. 042081
Author(s):  
Patrycja Miera ◽  
Jacek Golaszewski ◽  
Zbigniew Giergiczny
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Heat Of Hydration

The Influence of WH-II Super Set-Retarding Agent on the Heat of Hydration and Indices of Portland Cement

2011 ◽  
Vol 199-200 ◽  
pp. 1684-1692
Author(s):  
Chao Gao ◽  
Shao Xia Gao ◽  
Hong Zhou Chen
Keyword(s):  
Portland Cement ◽  
Setting Time ◽  
Heat Of Hydration ◽  
Paper Study

This paper study on effects of WH-Ⅱ super set-retarding agent on the hydration,the heat of hydration,the setting time and strength of Portland cement The author does test on the hydration with the methods of XRD and SEM.The results show that fitful amount of WH-Ⅱ super set-retarding agent is effective on retarding the setting time and improving the strength of Portland cement.

scholarly journals Thermal Properties of Calcium Sulphoaluminate Cement as an Alternative to Ordinary Portland Cement

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7011
Author(s):  
Małgorzata Gołaszewska ◽  
Barbara Klemczak ◽  
Jacek Gołaszewski
Keyword(s):  
Activation Energy ◽  
Portland Cement ◽  
Apparent Activation Energy ◽  
Thermal Behaviour ◽  
Ordinary Portland Cement ◽  
Isothermal Calorimetry ◽  
Heat Of Hydration ◽  
Curing Temperature ◽  
Cement Pastes ◽  
Calcium Sulphoaluminate

This paper presents the results of research into the heat of hydration and activation energy of calcium sulphoaluminate (CSA) cement in terms of the dependence on curing temperature and water/cement ratio. Cement pastes with water/cement ratios in the range of 0.3–0.6 were tested by isothermal calorimetry at 20 °C, 35 °C and 50 °C, with the evolved hydration heat and its rate monitored for 168 h from mixing water with cement. Reference pastes with ordinary Portland cement (OPC) were also tested in the same range. The apparent activation energy of CSA and OPC was determined based on the results of the measurements. CSA pastes exhibited complex thermal behaviour that differed significantly from the thermal behaviour of ordinary Portland cement. The results show that both the w/c ratio and elevated temperature have a meaningful effect on the heat emission and the hydration process of CSA cement pastes. The determined apparent activation energy of CSA revealed its substantial variability and dependence, both on the w/c ratio and the curing temperature.

scholarly journals The Application of a New Oxidation Mortar Bar Test to Mixtures containing Different Cementing Systems

2021 ◽  
Author(s):  
Bassili Guirguis ◽  
Medhat Shehata ◽  
Josée Duchesne ◽  
Benoît Fournier ◽  
Benoît Durand ◽  
...  
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Pore Structure ◽  
Heat Of Hydration ◽  
Iron Sulphide ◽  
Oxidizing Agent ◽  
Field Exposure ◽  
Bar Test ◽  
Reactive Alumina ◽  
Mortar Bar

The effects of different cementing systems on the expansion of mortars containing iron sulphide-bearing aggregate was studied. Using a recently developed oxidation mortar bar test, the results showed that cementing systems containing low-calcium fly ash, metakaolin, slag, high-sulphate resisting Portland cement, or low heat of hydration Portland cement could reduce the expansion by 50–85%. The main suggested mechanisms behind the reduced expansion is the more refined pore structure of samples with SCMs, and the reduced C3A of low heat of hydration Portland cement. The refined pore structure reduces the permeation of the oxidizing solution into the samples. The similarity of this to penetration of oxygen into concrete under field exposure needs to be determined. Soaking the samples for >3 h in the oxidizing agent can produce excessive expansion – not related to oxidation of iron sulphide phases – in samples with cementing blends containing reactive alumina such as metakaolin.

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