Significant drying shrinkage is one of the main limitations for wider utilization alkali-activated slag (AAS). Few previous works revealed that it possible to reduce AAS by use shrinkage-reducing admixtures (SRAs). However, these studies were mainly focused on SRA based polypropylene glycol, while as shown in this paper, behavior 2-methyl-2,4-pentanediol can be significantly different. While 0.25% and 0.50% had only a minor effect properties, 1.0% reduced waterglass-activated mortar more...

In recent years, the utilization of different non-traditional cements and composites has been increasing. Alkali-activated cementitious materials, especially those based on alkali activation blast furnace slag, have considerable potential for in building industry. However, alkali-slag exhibit very rapid setting times, which are too short some circumstances, these materials cannot be used applications. Therefore, it is necessary to find a suitable retarding admixture. It was shown that sodium...

Cement kiln by-pass dust (CKD) is a fine-grained by-product of Portland clinker manufacturing. Its chemical composition not suitable for returning back into feedstock and, therefore, it has to be discharged. Such an increasing waste production contributes the high environmental impact cement industry. A possible solution ecological processing CKD its incorporation alkali-activated blast furnace slag binders. Thanks alkaline content, serves as effective accelerator latent hydraulic substances...

Abstract The critical step for any subsequent instrumental analysis of cementitious binders is to stop their hydration reactions, i.e., remove free water. One the most available techniques a solvent exchange method. However, solvents are known be strongly bound in ordinary Portland cement (OPC) paste and alter results thermogravimetric (TGA) sensitive hydrates, while effect on TGA response alkali-activated slag (AAS) has not been comprehensively investigated. Therefore, objective this paper...

The very early stages of alkaline activation slag control its rheology and setting, but also affect hydration, which occurs later. Simultaneously, these parameters are dictated by the nature dose activator. Therefore, we investigated compared changes in particles (SEM, BET, laser diffraction), as well pore solution composition (ICP-OES), pH, conductivity, alkali-activated (AAS) pastes containing three most common sodium activators (waterglass, hydroxide, carbonate) water during first 24 h...

This study investigates the relationships between hydration kinetics of waterglass-activated slag and development its physical-mechanical properties, as well color change. To modify calorimetric response alkali-activated slag, hexylene glycol was selected from various alcohols for in-depth experiments. In presence glycol, formation initial reaction products restricted to surface, which drastically slowed down further consumption dissolved species dissolution consequently delayed bulk by...

A typical example of an alternative binder to commonly used Portland cement is alkali-activated binders that have high potential as a part toolkit for sustainable construction materials. One group these materials slag. There lack information about its long-term properties. In addition, mechanical properties are characterized most often in terms compressive strength; however, it not sensitive enough sufficiently cover the changes microstructure such microcracking, and thus, poses risk...

Alkali-activated materials, especially when activated by water glass, exhibit substantial drying shrinkage that hinders their broader industrial application. The effect of shrinkage-reducing admixtures (SRA), based on polypropylene glycol, alkali-activated blast furnace slag (BFS) mortars was examined. determination SRA efficiency and the influence potassium alkali activators with varying silicate modulus characteristics were studied. It observed a high amount alkalis positively affected...

Alkali-activated systems (AAS) represent an ecologically and economically sustainable inorganic binder as alternative to ordinary Portland cement (OPC). One of the main benefits AAS is their durability in aggressive environments, which can be equal or even better than that OPC. In this paper, influence type alkaline activator alkali-activated blast furnace slag terms resistance sulfur dioxide corrosion was investigated. The testing process based on CSN EN ISO 3231 standard simultaneously...

Hybrid systems represent a new sustainable type of cement combining the properties ordinary Portland and alkali-activated materials. In this study, hybrid system based on blast furnace slag clinker was investigated. The economic aspects appropriate waste management resulted in usage technological from water glass production (WG-waste) as an alkaline activator. Although content very low, incorporation by-product significantly improved mechanical properties. Nevertheless, high amount alkalis...

Abstract Alkali-activated systems belong to the group of alternative inorganic binders in which binder properties are dictated by both aluminosilicate precursor and alkaline activator. In this work, blast furnace slag three different activators, namely sodium hydroxide, water glass, carbonate, were selected. An innovative mixture design based on same concentration alkali (Na + ) 4 mol/dm 3 for all activators volume fractions pastes, ranging from 0.44 0.54, was investigated flow table test,...

Abstract The resistance of alkali-activated materials (AAMs) to degradation processes, particularly the decalcification, was studied in this paper. ground granulated blast furnace slag using various activators with same activator dosage 6% Na 2 O by weight (sodium hydroxide, sodium waterglass and carbonate) subjected testing decalcification (immersion 6M NH 4 NO 3 ) for 84 days. reference samples were stored water. progress phenolphthalein technique, mechanical properties (compressive...

Over the past decades, efficiency of silicate-based surface treatment agents, in other words, sealers, concrete systems has been widely investigated. The technology protects cementitious against penetration undesirable substances. Nevertheless, understanding several aspects concerning sealers is not entirely clear. This paper studies action mechanism selected silicates such as potassium, sodium, lithium water glasses, and colloidal silica. effectiveness used terms absorption reduction,...

Protection of concrete against aggressive influences from the surrounding environment becomes an important step to increase its durability. Today, alkali silicate solutions are advantageously used as pore-blocking treatments that hardness and impermeability concrete's surface layer. Among these chemical substances, known densifiers, lithium growing in popularity. In present study, composition densifiers is put into context with properties newly created insoluble inorganic gel responsible for...

The paper deals with the experimental determination of shrinkage development composites based on alkali-activated slag (AAS). main aim investigation was to verify effect addition shrinkage-reducing admixture (SRA) overall process properties during AAS ageing.

One of the largest obstacles for wider use alkali-activated slag (AAS) in a building industry is its severe drying shrinkage. According to some studies shrinkage-reducing admixtures (SRAs) could be solution this problem, but they were also reported have fatal impact on AAS hydration resulting serious strength development slowdown. The aim paper was investigate phenomenon wide range waterglass doses (4–12% Na 2 O mass). Mortars without and with 2% SRA based hexylene glycol prepared their...

This paper deals with the mechanical properties and phase study of alkali activated blast furnace slag by-pass cement kiln dust mixture. The (CKD) solves problem significant shrinkage materials which is considerably limiting their practical applications. mechanism action CKD in matrix has been investigated as well its optimal dosage means properties. reaction products during hydration process were characterized by X-ray powder diffraction.

Abstract Rheology of alkali-activated slag (AAS) is a very complex issue, where the activator nature as well its dose play an important role. Moreover, use water-reducing admixtures in these systems they often do not work properly. This could be attributed to high pH surface chemistry AAS. Therefore, lignosulfonate-, polynaphthalene- and polycarboxylate-based superplasticizers were used modify AAS pastes with sodium waterglass, hydroxide carbonate activator. These tested using rotational...

In this paper, the resistance of alkali-activated blast furnace slag to degradation processes caused by action various acids was studied. The ground granulated using sodium hydroxide in 6% Na 2 O dosage weight and subjected testing acid both organic inorganic acidic solutions (pH ≈ 3) for 84 days. Citric, acetic, hydrochloric, sulphuric were used these purposes. reference samples stored water. progress studied phenolphthalein technique, compressive strength testing, measurements. Moreover,...

The study deals with the methodology for determining chemical composition of alkaline silicate solutions. Nowadays, most widely used method in industry is titration, using color change an acid-base indicator. This technique very accurate determination total alkalinity (i.e., Na2O, K2O, or Li2O). However, a problem arises SiO2 content, since methyl red indicator slow and therefore equivalence point unclear. main aim this work to present benefits conductometric where indicated by sudden...