Adhesion characterisation of Portland cement concrete and alkali-activated binders

Abstract

In this paper, alkali-activated binders (AAB) are investigated for their potential use as repair materials of Portland cement concrete (PCC). The adhesion characterization of PCC and repair materials using AAB made from fly ash (FA) and Portland cement (PC) activated with sodium hydroxide and sodium silicate solutions, AAB made from FA and calcium hydroxide (CH) activated with sodium hydroxide and sodium silicate solutions, and commercial repair material (RMs) have been investigated. Test results show that the AAB 2 with additives gives high bond strength which is similar to the use of RMs. Bond strength between PCC substrate and AAB with additives are improved, due to increased reaction products especially C-S-H gel. However, the CH replacement at 15% shows a large amount of calcite resulting in reduction in bond strength. The failure patterns and fracture interface images of the tested specimens also demonstrate the quality of the developed bond strength. It was shown that the interface zone of PCC substrate and AAB is homogeneous with no visible gap between the two bonding surfaces. It is suggested that the AAB with PC as additive can be used as a repair binding material which not only has high bond strength but also is cost-effective.

Drying shrinkage, strength and microstructure of alkali-activated high-calcium fly ash using FGD-gypsum and dolomite as expansive additive

“…One of them is the alkali-activated binders that could produce from precursors consisting of Si 4+ and Al 3+ ions activated with a high alkali solution [7,8]. Many researchers [9][10][11][12] reported that the alkali-activated binders provided excellent mechanical and durability properties. Besides, alkali-activated binders showed a lower CO2 footprint than those of PC and epoxy-resin.…”

“…The studies of Phoo-ngernkham et al [16] and Phoongernkahm et al [17] have shown that the use of FA with additives exhibited the early strength development like the PC system. Thus, it could be used as repair material described in previous studies [10][11][12]18]. Note that the properties of repair material in terms of rapid setting, high strength, high bonding, and high durability are needed.…”

A Mix Design Procedure for Alkali‐Activated High‐Calcium Fly Ash Concrete Cured at Ambient Temperature

“…erefore, the AAHFAC could be used as an alternative repair material as reported by several publications [13,14,20,29,[41][42][43]. ere are many reasons such as high compressive strength [44], negligible drying shrinkage [45], low creep [46], good bond with reinforcing steel [47,48], good resistance to acid and sulfate [3,27], fire resistance [49], and excellent bond with old concrete [14,20,28]. For the effect of coarse aggregate size, the strength development tends to decrease with the increase of coarse aggregate size.…”

Reliability of Alkali-Activated and Portland Cement Mortar Under Compressive Test by Acoustic Emission

“…It can also give several advantages, such as reducing CO2 emissions, having a high level of workability, more resistant to chemical attack, and resistant to high temperatures [1][2]. The research of [3][4] attempted to utilize waste material as an alternative for repair material. Study of [5] investigated the effect of alkali solutions on geopolymer properties.…”