Effects of acid attack and cassava flour dosage on the interfacial transition zone thickness, durability and mechanical characteristics of high-strength (HS) concrete

Adam, Marwa Gumma Omer; Koteng, David Otieno; Thuo, Joseph; Matallah, Mohammed

doi:10.1016/j.rineng.2023.101001

Cited by 6 publications

(2 citation statements)

References 63 publications

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“…In summary, we can see that the porosity and structural densities of ITZ are directly related to the macroscopic strength of concrete, and the higher the strength and densities of ITZ, the better the mechanical properties of concrete. After modification of cementitious material, Hancheng Dan et al [40] found that the microcracks in the interfacial transition zone were above 5 µm. Golewski, G.L.…”

Section: Concrete Splitting Strengthmentioning

confidence: 99%

The Influence of Slag Content on the Structure and Properties of the Interfacial Transition Zone of Ceramisite Lightweight Aggregate Concrete

Fan,

Chen,

et al. 2024

Materials

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Ceramisite lightweight concrete has excellent performance and relatively light self-weight characteristics. At the same time, the recent development of green high-performance concrete and prefabricated components has also brought the abundant utilization of these mineral mixture. An interfacial transition zone exists between the hardened cement paste and the aggregate, which is the weakest part of the concrete, characterized by high porosity and low strength. In order to study the effect of slag content on the interfacial transition zone in lightweight high-strength concrete, experiments were designed to replace cement with slag at different contents (0%, 5%, 10%, 15%). A series of studies was conducted on its macro-strength, microstructure, and composition. The results indicated that the addition of slag improved the porosity and width of the interfacial transition zone. Adding slag did not reduce the thickness of the concrete interfacial transition zone significantly at 3 d, but it led to significant improvement in the thickness of the interfacial transition zone at 28 d, and the thickness of the interfacial zone at 28 d was reduced from 19 μm to 8.5 μm, a reduction of 55%. The minimum value of microhardness in the slurry region of the interfacial specimens also increased from 19 MPa to 26 MPa, an increase of 36%. In addition, the structural density of the interfacial region was further increased, resulting in varying degrees of improvement in the macroscopic anti-splitting strength. One of the important reasons for this phenomenon is that the addition of slag optimizes the chemical composition of the interface and promotes the continuation of the pozzolanic reactivity, which further enhances the hydration at the interface edge.

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Section: Concrete Splitting Strengthmentioning

confidence: 99%

The Influence of Slag Content on the Structure and Properties of the Interfacial Transition Zone of Ceramisite Lightweight Aggregate Concrete

Fan,

Chen,

et al. 2024

Materials

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“…In the simplest solutions, i.e., concretes based on binary binders, OPC is replaced by only one additional component, e.g., fly ash (FA), silica fume (SF), or metakaolin (MK) [34][35][36]. The benefits which have been observed from such solutions include limiting the width of the initial microcracks in concretes of this type, reduction of porosity of such materials, and improving their mechanical parameters [37][38][39]. In most cases, however, such effects resulted from strengthening the cement matrix structure through the development of additional C-S-H and C-A-S-H phases [40][41][42].…”

mentioning

confidence: 99%

Concrete Composites Based on Quaternary Blended Cements with a Reduced Width of Initial Microcracks

Golewski

2023

Applied Sciences

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This article is devoted to the study of the combined effect of siliceous fly ash (FA), silica fume (SF), and nanosilica (nS) on the cement matrix morphology and size of microcracks occurring in the Interfacial Transition Zone (ITZ) between the coarse aggregate and the cement paste of concrete composites based on ordinary Portland cement (OPC). The manuscript contains analyses of width of microcracks (Wc) occurring in the ITZ area of concretes based on quaternary blended cements and changes in ITZ morphology in the concretes in question. Experiments were planned for four types of concrete. Three of them were composites based on quaternary blended cements (QBC), while the fourth was reference concrete (REF). Based on the observations of the matrices of individual composites, it was found that the REF concrete was characterized by the most heterogeneous structure. However, substitution of part of the cement binder with active pozzolanic additives resulted in a more compact and homogenous structure of the cement matrix in each of the QBC series concretes. Moreover, when analyzing the average Wc values, it should be stated that the modification of the basic structure of the cement matrix present in the REF concrete resulted in a significant reduction of the analyzed parameter in all concretes of the QBC series. For QBC-1, QBC-2, and QBC-3, the Wc values were 0.70 μm, 0.59 μm, and 0.79 μm, respectively, indicating a decrease of 38%, almost 48%, and 30%, respectively, compared with the working condition of concrete without additives. On the basis of the above results, it can therefore be concluded that the proposed modification of the binder composition in the analyzed materials clearly leads to homogenization of the composite structure and limitation of initial internal damages in concrete.

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Effect of reed straw on the performance of recycled brick aggregate concrete and evaluation of economic benefits

Zhao,

Lu,

Liu

et al. 2024

Construction and Building Materials

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Effects of acid attack and cassava flour dosage on the interfacial transition zone thickness, durability and mechanical characteristics of high-strength (HS) concrete

Cited by 6 publications

References 63 publications

The Influence of Slag Content on the Structure and Properties of the Interfacial Transition Zone of Ceramisite Lightweight Aggregate Concrete

The Influence of Slag Content on the Structure and Properties of the Interfacial Transition Zone of Ceramisite Lightweight Aggregate Concrete

Concrete Composites Based on Quaternary Blended Cements with a Reduced Width of Initial Microcracks

Effect of reed straw on the performance of recycled brick aggregate concrete and evaluation of economic benefits

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