𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The influence of different additions on portland cement hydration heat

✍ Scribed by M.I. Sánchez de Rojas; M.P. Luxán; M. Frías; N. García

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
432 KB
Volume
23
Category
Article
ISSN
0008-8846

No coin nor oath required. For personal study only.

✦ Synopsis

This paper presents the results obtained using the Langavant Calorimeter method on portland cements with different addition materials that are commonly used in the manufacture of commercial cements. The effects of these materials on the hydration heat with respect to a control cement were studied.

The first hours show that most of the additions, which present higher activity at early stages, increase the hydration heat of their mixed cements in relation to the control cement.

The use of pozzolans reduces the heat given off by the cements during hydration. However, the reactions of the pozzolanic materials with the lime also produce heat and the decrease should not be proportional to the level of clinker substitution in the mixed cements.

📜 SIMILAR VOLUMES

Effect of citric acid on the hydration o
Effect of citric acid on the hydration of portland cement
✍ N.B. Singh; A.K. Singh; S. Prabha Singh 📂 Article 📅 1986 🏛 Elsevier Science 🌐 English ⚖ 470 KB

The hydration of portland cement in presence of citric acid has been investigated. The results indicate that O.l% citric acid accelerates whereas too high a dose (> 0.1%) of citric acid retards the hydration. Electrical conductivity measurements of the paste indicate that in the presence of citric a

Secondary ettringite formation in heat t
Secondary ettringite formation in heat treated portland cement concrete: Influence of different W/C ratios and heat treatment temperatures
✍ H. Siedel; S. Hempel; R. Hempel 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 613 KB

Scanning electron microscope and DTA investigations were made to characterize secondary ettringite formation in portland cement concrete mixtures with varying W/C ratios and heat treatment maximum temperatures. After a 500 days storage programme including water and air storage as well as freezing/th

The pozzolanic activity of different mat
The pozzolanic activity of different materials, its influence on the hydration heat in mortars
✍ M.I.Sánchez de Rojas; M. Frías 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 573 KB

This work presents the relationship that exists between pozzolanic activity in certain materials (opaline rocks, fly ash and silica fume) and hydration heat, measured using the Langavant calorimeter method. Pozzolanic activity is evaluated using an accelerated method that establishes the reaction sp