... to varying fineness levels retained on a sieve no. 325 at 5 ± 1%, 15 ± 1%, 25 ± 1%, and 35 ± 1% by weight. Mortars were prepared by replacing 20% of Portland cement with each type of ground POFA . Compressive strength, drying shrinkage and expansion were evaluated, the latter by autoclave test. After 28...

...Jiasui Wang; Jin Chai Lee; Surong Luo; Yanran Shen; Xuefang Wang; Wenda Wu The large drying shrinkage of geopolymer seriously hinders its industrial production and application. In this study, mechanochemical processing was introduced into the one-part geopolymer to alleviate its drying shrinkage...

... advantages. Although the mechanical properties and durability of BFS concrete are excellent, there are still some issues that need to be addressed – for example, significant drying shrinkage. To mitigate the drying shrinkage, a shrinkage-reducing agent ( SRA ) is one important kind of admixture...

... proportions of BCSA cement, PLC and calcined clay ( CC ). Workability was assessed using a flow test, and mechanical properties were evaluated through compressive strength and shrinkage tests. The hydration process was analysed using thermogravimetric analysis, scanning electron microscopy and X-ray...

... with a water/cement ratio (w/c) of 0.50 and a cement content of 320 kg/m³. calcium sulfoaluminate cement CSA–OPC blends durability Portland cements pozzolanic activity pozzolans shrinkage In the cement production process, most of the carbon dioxide (CO_{2) released is generated}...

...Zhenmin Wan; Tingshu He The characteristics of shotcrete can lead to significant shrinkage deformation, presenting potential threats to tunnel structure safety. To research this concern, in this study the effects of three accelerators on the volume stability of cement paste, cement mortar...

... engineering parameters of compressive and flexural strengths, ductility, ultrasonic measurements, chloride penetrability and drying shrinkage. Moreover, scanning electron microscopy coupled with energy dispersive X-ray analysis and X-ray diffraction were used to analyse the reaction products related to CAC...

...Mohammad Javad Mahmoodi; Masoumeh Khamehchi; Mohammad Safi A comprehensive semi-empirical model was developed to predict the drying shrinkage strain (DSS) of concrete reinforced with graphene oxide nanosheets (GONs). The model includes various internal and external parameters. The effects of three...

... also indicated as potentially significant, although this was not proven experimentally in this study. The slightly lower compressive strength reported for mixes containing 40 wt% CSA was associated with better-formed ettringite. The same was identified as the key to lowering total shrinkage in mixtures...

...Qing Wang; Wenjie Huang; Jing Sun; Jun Zhang The shrinkage and internal relative humidity (RH) of internally cured high-strength engineered cementitious composites (HSECCs) based on ordinary Portland cement (OPC) were experimentally investigated. Natural zeolite and calcined zeolite particles were...

... mortar to increase compressive strength and reduce drying shrinkage when the content of alkali sulfates is less than 0.6% sodium oxide equivalent (Na₂O_eq). 18 06 2021 25 04 2022 Emerald Publishing Limited: All rights reserved 2022 blended cements compressive...

...Jianwei Fang; Liwu Mo; Bei Huang; Min Deng; Aiguo Wang Various strategies have been developed to mitigate the autogenous shrinkage of cement-based materials (CBMs), including internal curing and shrinkage compensation. However, the sole use of internal curing or shrinkage compensation...

...Hadi Mazaheripour; Rui Faria; Miguel Azenha; Guang Ye Shrinkage of hardened cement paste is a direct result of its desorption isotherm. The relationship between the desorption isotherm and the relative humidity in a hydrating cement paste is mainly controlled by the pore size distribution...

...Mariana dos Santos Motta; Lourdes Maria Silva Souza; Flávio de Andrade Silva The aim of this research was to investigate the effect of the addition of discrete polypropylene fibres (PPF) and curaua fibres (CF) on the early-age autogenous and drying shrinkage of cement pastes. The fibres used were...

... time or hydration. It was also found that the autogenous shrinkage of concrete can be mitigated with a replacement of LBD up to 20% and the free expansion levelled off early and was kept at a low level. The compressive strength of concrete made with the blended cement, especially with 10% LBD...

... regime. Although increasing the ratio of magnesia to phosphate is detrimental to the strength of MPC in air, it was able to improve the water stability. The strength development of MPCs with steel slag was found to similar to those of the fly ash blends, but showed poor water stability. The shrinkage...

...Behnam Vakhshouri; Sri Ravindrarajah Rasiah; Shami Nejadi This study investigates the drying shrinkage of light-weight concrete containing expanded polystyrene beads. Nine shrinkage specimens in three groups were subjected to three different conditions of drying and wetting periods for 450 d...

... to be effective, through the peaks on the rate curve of resistivity and the inflection point on the electrical resistivity–log time curve. The effects of GGBS on autogenous shrinkage and compressive strength development were also studied. It was found that compressive strength at 3 d could be predicted...

...-friendly. However, high shrinkage limits the adoption of AAS. This paper investigates the potential of shrinkage mitigation in AAS paste by combining a low volume fraction of dry and water-saturated natural cellulose fibres (NCFs), which act as an internal curing agent, depending on their porous structure...

...Lukas Kalina; Vlastimil Bilek, Jr; Radoslav Novotny 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...