Thirty one mix proportions of ordinary Portland cement OPCslag mortars OSM used to study the effects of temperature on early and ultimate strengths. Three levels of slag 0, 40, and 50 and different temperatures were used it was found that
Apr 08, 2019 activation Slag cement reacts slower than portland cement Hydration of portland cement produces C-S-H and CH CH reacts with the slag cement, breaking down the glass phases and causing the material to react with water and form C-S-H Slag cement is not pozzolanic It does consume CH by binding alkalis in its hydration products
The setting agent CaOH2 for activation of slag cement is used in the proportions of 0, 2, 4, 6, 8 and 10 by various methods substitution and addition by mass of slag cement. The physical properties of slag cement activated by the calcium hydroxide at anhydrous and hydrated states fineness, particle size distribution, consistency of the cement pastes and setting times were studied.
granulated blast furnace slag is to activate it using alkaline materials 1012. This approach helps to protect environ-ment by both reducing the Portland cement consumption and reuse of a waste material 13. A binder with accept-able mechanical properties can be obtained with activation of the slag. However, many factors may substantially affect
For slag-PC mixes to obtain strengths equivalent to Type I PC mixes, the data suggests that sufficient activators need to be present to activate the slag. Slag proportions of 40 to 60 appear to be the optimum level for highest strength development.
Approaches including mechanical activation and chemical activation were adopted to improve the cementitious activity of the slag. By taking the strength of the backfill materials as the evaluation standards, the hydration activity and cementitious performance of the slag were investigated under different activation conditions, and the mechanism of chemical activation was analyzed.
Slag and type F y ash obtained from local industries in South Korea were used as precursors to develop the alkali-activated grout used in this study. Ordinary Portland cement was used to produce the conventional cement grout. The Portland cement consisted of 21 SiO2, 62.5 CaO, 5.9 Al2O3, 3.2 Fe2O3, and 2.1 SO3. Table1presents the
May 30, 2016 In this study, the impact of activator type on the efflorescence formation severity and methods of efflorescence reduction in alkali-activated phosphorus slag cement are investigated. Different alkaline activators including NaOH, KOH and liquid sodium silicate of different silica modules Ms SiO2Na2O were used for alkali-activation of phosphorus slag.
The exact composition of slag varies over a range. In general, factors that determine the suitability of slag for usage in composite cement mainly include the fineness of grinding, glass content and the chemical composition. Fineness Like most of other cement materials, the reactivity of slag is influenced by its surface area.
IS 8112 and IS 12269 respectively. By agreement betweeo the purchaser and the supplier, testing of waterproofing compoonds may bc done will Portland slag cement conforming to IS 455 or Iortland poz,wlaoa cementFly ash based conforming to IS 14W Part 1 or Portland pozzolana cement- Calcined clay based conforming to IS 1489 Part 2.
To enhance the early strength of grounded granulated blast furnace slag GGBFS blended cement, the activation characteristics of GGBFS were examined by a potassium aluminum sulfate PSA clinker, consisting of KAlSO 4 2 and amorphous Al 2O 3 by calcining alunite K 2SO 4 Al 2SO 4 3 4AlOH 3 at 650 C for 30min. The PSA clinker reacted with calcium hydroxide and gypsum to form
BEHAVIOUR OF MORTAR AND CONCRETE MADE WITH ACTIVATED BLAST FURNACE SLAG CEMENT. Activated blast furnace slag cement ABFSC was used as binder in mortar and concrete. A commercial pelletized slag, produced for use in the construction industry, was activated with sodium sulphate, sodium carbonate, or sodium silicate and both normal curing and heat curing were used.
Cement-Slag Concrete Activated Using the By-Product of the Liquid Crystal Display Manufacturing Process Sung Choi 1 and Sukhoon Pyo 2, 1 Department of Civil Engineering, Kyungdong University, 27 Gyeongdongdaehak-ro, Yangju-Si 11458, Korea csomy1113kduniv.ac.kr 2 Department of Urban and Environmental Engineering, Ulsan National Institute of Science and
activated slag to that identified in Portland cements Bai et al., 2011, and is significantly less expensive than most other poss-ible activators. Sodium carbonate activation of blast-furnace 262 Advances in Cement Research Volume 28 Issue 4 Alkali-activated slag cements produced with a blended sodium carbonatesodium silicate activator
Alkali-activated slag AAS binders are obtained by a manufacturing process less energy-intensive than ordinary Portland cement OPC and involves lower greenhouse gasses emission. These alkaline cements allow the production of high mechanical strength and durable concretes.
tigates the possibility of developing a zero-cement binder Z-Cem using slag, FA, and RHA through the mechanical i.e., grinding of materials and chemical using chemical activators activation technique. To activate these materials, sodium hydroxide NaOH, calcium hydroxide CaOH 2, and potassium hydroxide KOH were used by weight of Z-
Slag cements of various compositions have already been known for quite some time. Slag cements, as a rule, contain a maximum of 50 by weight of blast furnace slag. Such slag cements or metallurgical cements usually contain approximately 15 by weight of CaSO 4 with a view to obtaining acceptable early strengths. While calcium sulfate and anhydrite contents are determining factors for early
Blended with Portland cement, slag can be activated with a relatively high pH solution of blend system caused by the hydration phase CH, which is one of the main hydration products of C 3 S and C 2 S in Portland cement. slag has been successfully used with Portland cement to produce blended cements.
The present invention provides a kind of preparation method and applications of waterglass used in alkali mineral cement, with rich silica containing sand or cullet, burn into capable collaboration processing altogether during brick and tile or ceramic sintering, produce waterglass used in alkali mineral cement or concrete, the preparation method of the present invention has the advantages ...
Thermal activation of ordinary Portland cementslag mortars Fathollah Sajedi , Hashim Abdul Razak Temperature variation caused by the heat of hydration, in mass concrete or the change of external environment, has a large influence on the mechanical properties of early-age concrete.
a slag-based geopolymer cement which consisted of metakaolin, blast furnace slag and alkali silicate. The benefit of this technology compared to OPC technology is that it hardened faster while reaching the maximal strength at early hours and provided a durable and compact microstructure.
AbstractThe setting agent CaOH2 for activation of slag cement is used in the proportions of 0, 2, 4, 6, 8 and 10 by various methods substitution and addition by mass of slag cement. The physical properties of slag cement activated by the calcium hydroxide at anhydrous and hydrated states fineness, particle size distribution, consistency of the cement pastes and setting times were studied.
Forss 1983 F-cement slag-alkali-superplasticizer Langton and Roy 1984 Ancient building materials characterized Davidovits and Sawyer 1985 Patent of Pyrament cement Krivenko 1986 DSc thesis, R 2OROSiO 2H 2O Malolepsy and Petri 1986 Activation of synthetic melilite slags Malek. et al. 1986 Slag cement-low level radioactive wastes forms
Sep 10, 2020 Commercial ordinary Portland cement OPC and ground blast furnace slag BFS were used in this study as raw materials. The chemical compositions of the raw materials used in this work, which were determined using an X-ray fluorescence analyzer XRF, are presented in Table 1.The median particle sizes of the OPC and BFS are 9.02 m and 8.89 m, respectively.