Effect of carbonate-containing self-healing system on properties of a cementitious composite: Fresh, mechanical, and durability properties

Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure

“…Therefore, the splitting tensile strength is the most effective characterization of interfacial bonding property. The splitting tensile strength is usually related to interface roughness, age of concrete substrate and other factors [ 13 , 15 , 16 ]. Karima Gadri et al [ 13 ] carried out the splitting tensile test according to Standard ASTM C496 in which the force applied was parallel to the bond line interface of the composite specimen, and found that the bonding of repair material was more significant in the case of a high roughness substrate.…”

An overview of a twofold effect of crystalline admixtures in cement-based materials: from permeability-reducers to self-healing stimulators

“…A recent research stated that the inclusion of a fumaric acid-based admixture enhanced concrete self-sealing [25]. Beyond the range of industrial options, the substantial variation is remarkable in the chemical composition even for the same manufacturer [28,39,43,51,61]. According to X-ray fluorescence results of CAs from Xypex, the C/S (calcium/silica) ratio varies from 3.3 up to 7.4, which represents a considerable difference when it comes to the main compounds.…”

“…Another work [45] reported that mortars produced with a mixed inclusion of CA and other mineral additions (CSA and bentonite) exhibited better performance than another produced only with CA in terms of the recovery of the chloride diffusion coefficient. Wang et al [39] proposed a cementitious system with lightweight clay aggregate (LWA) for carrying selfhealing agents, along with a combination of four types of admixtures (CA, CSA, Na 2 CO 3 , and CaHPO 4 .2H 2 O). Based on an optical microscope observation, the presence of admixtures enhanced the self-closing ability.…”

The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete

“…There are many technologies used for aggregate impregnations. In order to increase the aggregate tightness, depending on its type, it may be coated with e.g.,: cement paste [ 21 , 22 , 23 , 24 , 25 , 26 ], natural and synthetic polymers [ 21 , 24 , 27 , 28 , 29 , 30 , 31 , 32 ], calcium metasilicate [ 33 ], sodium silicate [ 22 , 24 , 30 ] or sodium carbonate solutions [ 34 , 35 ], kerosene, different oils [ 24 ], paraffin [ 18 , 31 , 36 , 37 , 38 , 39 ]. It should be stated that in some research, the priority goal of LWA immersion in paraffin or polyethylene glycol is not so much to make concrete tighter but to incorporate the phase change material into the composite in order to improve its thermal properties [ 31 , 36 , 37 ] or freeze-thaw resistance [ 39 ].…”

“…It should be stated that in some research, the priority goal of LWA immersion in paraffin or polyethylene glycol is not so much to make concrete tighter but to incorporate the phase change material into the composite in order to improve its thermal properties [ 31 , 36 , 37 ] or freeze-thaw resistance [ 39 ]. Similarly, in the case of pre-coating lightweight aggregates with silicates or carbonates solutions, apart from the immediate sealing effect, the self-healing mechanism is also important [ 30 , 34 , 35 ]. Generally, the process of pre-coating for natural or manufactured LWA of mineral origin is much simpler in relation to procedures applied for recycled aggregates or natural organic ones.…”