Autogenous shrinkage of alkali-activated slag cement (AASC) paste prepared with different levels of alkali dosage and silicate modulus (M s) is investigated.The results show that autogenous shrinkage of AASC paste increases at a decreasing rate with alkali dosage, which is attributed to enhanced capillary pore pressure and syneresis of …
DetailsA multi-method approach was used for the investigation and comparison of alkali-activated slag binders (AAS), pure slag and ordinary Portland cement (OPC). X-ray …
DetailsA new type of magnesia modification alkali-activated cement was prepared, the strength, setting time, shrinkage ratio and cracking behavior, as well as the composition and structure of the hydration product were investigated. The results indicate that the setting time of this cement is similar to that of the ordinary commercial cements; its strength …
DetailsThereafter, the wet alkali-activated concrete should be protected during the hardening and curing period to avoid moisture loss. This procedure is the same for Portland concrete's in-situ casting. Fig. 12 shows an in-situ casting, where blast furnace slag alkali-activated concrete is being poured in place and in between reinforced steel bars ...
DetailsThis paper examines the corrosion of alkali-activated blast furnace slag cement in pH 3 nitric acid, pH 3 acetic acid, 30% CaCl2 solution and 15% CO2 atmosphere at relative humidity of 52%. ASTM Type I Portland cement is used as a reference. Experimental results indicate that alkali-activated slag pastes are corroded more slowly …
DetailsThe Slag Cement Association has published 30 information sheets in the Slag Cement in Concrete series. These are listed below in numeric order. Click on any of the sheets for …
DetailsAccording to Multon [73], the expansion of the gel includes two phases namely alkali-silica gel hydration and increased volume followed by the gel diffusion in the cement paste.During the hydration of alkali-silica gel the chemical potential difference between the solution within the gel and the concrete pore solution induces higher water …
DetailsTitle: Experimental Study of Carbonation Resistance of Alkali- Activated Slag Concrete Author(s): Ying-Hua Bai, Sheng Yu, and Wei Chen Publication: Materials Journal Volume: 116 Issue: 3 Appears on pages(s): 95-104 Keywords: alkali slag concrete; carbonated; hydrotalcite; MgO DOI: 10.14359/51715585 Date: 5/1/2019 …
DetailsThe environmental impact from the production of cement has prompted research into the development of concretes using replacement materials activated by alkali solutions. This paper reports research into the durability of AAS concrete. The durability properties of AAS have been studied for a range of sodium oxide dosages and …
DetailsThe chemical compositions of the slag, RCF, and CRCF are presented in Table 1.It can be seen that the primary active constituents in these materials, namely CaO, SiO 2, and Al 2 O 3, are contained in the slag at a proportion of 89.7 %.When comparing RCF and CRCF before and after carbonation, an increase of 2.09 % in the loss on …
DetailsEco-friendly antimicrobial alkali-activated slag (AAS) binders show great promise in newly designed and existing wastewater infrastructure threatened by microbial induced …
DetailsThe technology of slag cement predates by more than a century, with a patent awarded to Kuhl [] in 1908 and later in 1930. wherein slag was activated with alkaline liquid comprising of potassium hydroxide.In 1937, Chassevent [] conducted experimental research on the reactivity of slag by using an alkaline solution consisting of …
DetailsTo accomplish environmental sustainability and reduce carbon emission, the construction industry needs to adopt waste industrial by-products as construction materials. To resolve this issue, this study investigated the strength and durability performance of alkali-activated concrete (AAC) using industrial waste products such as ground …
DetailsMineralogy. From the Müller (1977) study of nearly 100 European CKDs, it was found that the dusts are partic-ulate mixtures of four major components: (1) unreacted raw feed, (2) partially calcined feed and clinker dust, (3) free lime, and (4) enriched salts of alkali sulfates, halides, and other volatile compounds.
Details1. Introduction. Blast-furnace slag can be defined as a molten material that is formed during the refining of iron ore at temperature of 1400–1600 °C [1], [2].The slowly cooling of the molten material produces crystalline stone namely air-cooled slag (ACS) with lower reactivity compared to the glassy granulated blast-furnace slag (GBFS) that …
DetailsAlkali-activated slag (AAS) cement is a kind of geopolymer, which is a cementitious material prepared by mixing activators and granulated blast furnace slag (GBFS). Under …
DetailsAlkali-activated slag concrete (ASC) was prepared by using slag and Na2SiO3, NaOH complex activator. Freeze–thaw resistance, microstructure, performance mechanism, inner freeze–thaw damage ...
DetailsAlkali-activated slag cement and concrete: a review of properties and problems. Adv. Cem. Res, 7 (27) (1995), pp. 93-102. CrossRef View in Scopus Google Scholar [3] F Puertas. Cementos de escorias activadas alcalinamente: situación actual y perspectivas de futuro. Mater. Construcc., 239 (1995), pp. 53-64
DetailsA growing interest in alternative cements has emerged with the sole purpose of reducing the environmental footprint associated with cement production. One of the promising …
Detailscement, and sometimes other cementitious materials, in the determination because alkali contribution from other ingredients is usually small.Therefore, total alkali content of concrete is calculated as follows: (kg cement/m3) x (% Na 2 O equivalent†† in cement)/100 = kg alkali/m3 (lb cement per yd3) x (% Na 2 O equivalent in cement)/100 ...
DetailsAlkali-activation kinetics of phosphorus slag cement using compressive strength data Ceramics – Silikáty 59 (3) 250-260 (2015) 251 3) an accurate measurement of the amount of products
DetailsThe volumetric instability of alkali-activated slag (AAS) binders has raised concerns and impeded the acceptance of this Portland cement-free material. The objective of this article is to characterize the influence of drying rate on drying shrinkage behavior of AAS mortars to better understand the mechanisms responsible for its large shrinkage ...
DetailsAlkali-activated slag concrete (AASC) is a new green building material. The amount of CO 2 produced by AASC is 1/5th of that produced by ordinary Portland cement concrete (OPCC). In addition, AASC promotes the reuse of …
DetailsAlkali-activated concrete (AAC) is defined as a class of cement-free concrete that is an alternative to Portland cement concrete (PCC). ... Figure-1: Preparation of alkali-activated slag concrete hollow block …
DetailsChemical and microstructural characterization of environmentally friendly alkali-activated slag cement pastes and fine-limestone aggregate concretes have been carried out after aging for 20 months and compared with 55-day-old cement pastes. Although the production of crystalline phases slowed, the cement paste continues to react.
DetailsOrdinary Portland cement, alkali-activated slag cement, and geopolymers represent three different cementitious materials with their own characteristics and properties. These three types of materials have been extensively considered in the last 10 years. However, only specific studies about one type of cement have been considered.
DetailsThe objective of this work was to determine the mechanisms that govern the setting times of alkali-activated slag (AAS) cement pastes, as a function of the nature of the alkaline activator used. For this purpose three different activators were used: waterglass (Na2SiO2.nHaOH with a SiO2/NaO ratio equal 1·5), NaOH and Na2CO3. The …
DetailsThe aim of this study was to evaluate the drying shrinkage of one-part alkali-activated slag concrete (AASC) for up to 180 days that is influenced by mix design parameters. A total of 24 mix designs for AASC and one for OPC concrete were made and cured in two different environments. The impacts of mix design parameters including …
DetailsThe objective of this study was to evaluate the effect of two temperature ranges, 50–250 °C and 600–750 °C, in thermogravimetric analysis (TGA) on the compressive strength and drying shrinkage of alkali-activated slag-red mud (AASR). The abrasion resistance of AASR concrete as a function of shrinkage and compressive …
DetailsEquipment; Projects; Outputs; Prizes; Activities; Press/Media; Search by expertise, name or affiliation. Resistance of alkali-activated slag concrete to carbonation. ... Resistance of alkali-activated slag concrete to carbonation. Cement and Concrete Research, 31, 1277 - …
DetailsThe use of slag cement as a cementitious material dates back to 1774, when a mortar was made using slag cement in combination with slaked lime (Mather 1957). In 1862, a granulation process was proposed to facilitate removal and handling of iron blast …
DetailsAlkali-activated cement (AAC) is either clinker-less or free, and it is also environmentally friendly due to its low carbon footprint and wide range sources. Industrial wastes, like steel slag and blastfurnace slag, usually have latent hydraulic reactivity, and can be used as precursors of AAC. Both clinkerless and clinker-free AAC were prepared …
DetailsAlkali-activated cement (AAC) is either clinker-less or free, and it is also environmentally friendly due to its low carbon footprint and wide range sources. Industrial wastes, like …
DetailsAlkali-activated slag cement (AASC) is a clinker-free binder comprising ground granulated blast furnace slag (GGBFS) sourced from metallurgical industries. It is estimated that the production of one tonne of AASC generates approximately 0.18 tonnes CO 2 ; a value significantly lower than for conventional PC [ [4], [5], [6] ].
DetailsDOI: 10.1016/S0008-8846(98)00236-1 Corpus ID: 137143629; Workability and mechanical properties of alkali activated slag concrete @article{Collins1999WorkabilityAM, title={Workability and mechanical properties of alkali activated slag concrete}, author={Francis Gerard Collins and Jay G. Sanjayan}, …
DetailsThe structural development of a calcium (sodium) aluminosilicate hydrate (C–(N-)A–S–H) gel system, obtained through the reaction of sodium metasilicate and ground granulated blast furnace slag, is assessed by high-resolution 29 Si and 27 Al MAS NMR spectroscopy during the first 2 yr after mixing. The cements formed primarily …
DetailsThis value is 57.6 KJ/mol. AE" value obtained after the induction period for a blast furnace slag, activated with Na^S^ + NaOH at 4%Na20 is the same order ofthat obtained by Wu et al. (16) for a cement with slag containing 50% of slag (49.1 KJ/mol); Regourd et al. (17) for a cément with slag with a 80% FIG.
DetailsThis study evaluates the carbonation-induced properties and mechanisms of low to high calcium-based alkali-activated cement (AAC) compared with class G cement (GC). Cement systems exposed to carbonated brine for 28 days were experimentally characterised using chemical, mechanical, and microstructural tests.
DetailsPE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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