Structural concrete based on alkali‐activated binders: Terminology, reaction mechanisms, mix designs and performance

Herrmann, Annemarie; Köenig, Andreas; Dehn, Frank

doi:10.1002/suco.201700016

Cited by 52 publications

(40 citation statements)

References 76 publications

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“…Self‐desiccation in the AAS‐concrete with w/b = 0.41 (w/slag=0.45) took place at an age later than 28 days. Due to the lower elastic modulus of the AAS‐matrix, as measured in Reference , the capillary tensile stress can result in higher autogenous deformation in an AAS‐matrix contrary to a Portland cement matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Based on experimental results in Reference the applied activator consisted of a solution of NaOH and sodium silicate (Na 2 O· n SiO 2 ) (Table ). NaOH and sodium silicate were mixed before adding the solution to the concrete.…”

Section: Precursor Materials and Concrete Compositionmentioning

confidence: 99%

“…Due to eco‐friendliness and pronounced chemical resistance concretes based on alkali‐activated binders (AAB) are considered as a promising alternative to classical hydraulic binder systems (e.g., Portland cement (OPC)) . Generally, AAB can be described as mineral, inorganic, nonmetallic binders whose stiffening, setting, and hardening are based on the addition of an alkaline activator to precursor materials with high amounts of reactive silica (SiO 2 ) and alumina (Al 2 O 3 ) . The mostly used activators are NaOH, KOH, sodium silicate (Na 2 O·nSiO 2 ), and sodium carbonate (Na 2 CO 3 ) which can generate a highly alkaline environment in the fresh concrete state.…”

Section: Introductionmentioning

confidence: 99%

“…The precursor materials for AAB are either of natural resource or industrial by‐products, mainly composed of CaO, SiO 2 , and Al 2 O 3 , such as ground‐granulated blast furnace slag (GGBS), fly ash, and metakaolin. Dependent on the CaO‐content AAB can be classified as so‐called Ca‐rich, Ca‐poor, or even Ca‐free AAB …”

Section: Introductionmentioning

confidence: 99%

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Shrinkage and creep behavior of an alkali‐activated slag concrete

Dehn

2017

Structural Concrete

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In this paper, experimental results about the shrinkage and creep behavior of an alkali‐activated slag concrete (AAS‐concrete) are presented. The autogenous shrinkage of AAS‐concrete is pronounced at a relatively high water to binder ratio of 0.41. The ultimate value of autogenous shrinkage is determined to be higher than that of high‐strength concrete (HSC). The observed self‐desiccation at a later concrete age can be one of the reasons for the autogenous shrinkage. In a drying environment of 65% relative humidity AAS‐concrete exhibits a significantly higher total shrinkage compared to normal‐strength concrete composed of Portland cement. In the contrary to normal and HSC carbonation shrinkage must not be neglected for AAS‐concrete in the early concrete age. The sum of drying and carbonation shrinkage develops much more rapidly for AAS‐concrete in the first weeks after the beginning of drying. Based on the experimental results the shrinkage behavior of AAS‐concrete cannot be predicted by conventional models. The creep behavior of the AAS‐concrete was investigated under sealed and unsealed conditions. The creep coefficients for both conditions are higher than those calculated when using conventional models.

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Section: Resultsmentioning

confidence: 99%

Section: Precursor Materials and Concrete Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shrinkage and creep behavior of an alkali‐activated slag concrete

Dehn

2017

Structural Concrete

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“…For environmental protection, a new type of cementitious material should be developed as a sustainable alternative material. Alkali‐activated material (AAM) is considered to be a promising one …”

Section: Introductionmentioning

confidence: 99%

Study on the reaction process of alkali‐activated carbonatite by means of polarizing microscope and digital holographic microscope technology

Yin

Lin

et al. 2019

Structural Concrete

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The reaction process of alkali‐activated carbonatite and the dissolution rate of carbonatite with different content of MgO in water glass solution were studied in this paper by means of in‐situ technologies, that is, polarizing microscope (PM) and digital holographic microscope (DHM). The volume change of carbonatite particles as a function of dissolution time was also quantified by using DHM. The results show that the dissolution rate of carbonatites decreases as the increase of Mg content (from 0 to 21.6 wt. %) in carbonatites. The average dissolution rate of carbonatite with a MgO content of 11.37 wt. % in water glass (M = 1.6, c = 35%) is 75.33 μm3/h within the first 12 hr of dissolution. Both dedolomitization and alkali‐silica reaction are present in the alkali‐activated carbonatite system. The Mg‐carbonatite tends to dedolomitize first before it reacts with silicate ions. It explains why the Mg‐rich carbonatite has a lower dissolution rate in water glass.

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