Effect of different sand grading on strength properties of cement grout

Lim, Siong Kang; Tan, Cher Siang; Chen, Kah Pin; Lee, Min Lee; Lee, Wah Peng

doi:10.1016/j.conbuildmat.2012.08.030

Cited by 54 publications

(14 citation statements)

References 7 publications

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“…In all mortars, and regardless of the precursor or binder used, the smaller the maximum particle diameter of the aggregate, the greater the amount of liquid required to obtain a plastic consistency and, therefore, a certain workability. This effect is due to the increase in the specific surface area with the decrease in the aggregate particle size, which leads to greater liquid demands to moisten the aggregates, as previously described in the literature [42][43][44][45]. In particular, the liquid/solid ratio increases 3% when going from D max of 2 mm to 1 mm, while an increase up to 14% has been measured for aggregates of a D max of 0.5 mm.…”

Section: Mortar Liquid/solid Ratio Required For Plastic Consistencysupporting

confidence: 56%

Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates

et al. 2020

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The effect of two precursors (slag and fly ash), different particle size distribution, and three types of aggregate (siliceous sand, limestone, and recycled concrete) on alkali-activated material (AAM) mortar rheology were studied and compared to their effect on an ordinary Portland Cement (OPC) mortar reference. Stress growth and flow curve tests were conducted to determine plastic viscosity and static and dynamic yield stress of the AAM and OPC mortars. In both OPC and AAM mortars, a reduction of the aggregate size induces a rise of the liquid demand to preserve the plastic consistency of the mortar. In general terms, an increase of the particle size of the siliceous aggregates leads to a decrease of the measured rheological parameters. The AAM mortars require higher liquid/solid ratios than OPC mortars to attain plastic consistency. AAM mortars proved to be more sensitive than OPC mortars to changes in aggregate nature. The partial replacement of the siliceous aggregates with up to 20% of recycled concrete aggregates induced no change in mixing liquid uptake, in either AAM or OPC mortars. All the AAM and OPC mortars studied fitted to the Bingham model.

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Section: Mortar Liquid/solid Ratio Required For Plastic Consistencysupporting

confidence: 56%

Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates

et al. 2020

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“…Drying shrinkage occurs in the first 20 days of casting time, which significantly affects the concrete strength. Previous research showed that fibres reduced the drying shrinkage of FRFC [ 32 , 123 , 124 ]. Shrinkage may induce premature cracking and thus weaken the concrete strength.…”

Section: Properties Of Frfcmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.

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“…Such problems can be solved through improving mechanical properties of system that can fill cavities, fissures, voids or cracks by development of grouts. The application of grout materials and grouting technique are widely popular for construction nowadays 2 ; however, environmental safety must be taken in account while selecting grouts due to negative effects of chemical grouts on environment. In addition, though many grouts were reported with high strength, the compressive strength of grout-injected walls was not found to directly proportional to the compressive strength of the injection grouts used for grouting 3 .…”

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confidence: 99%

Bio-grout based on microbially induced sand solidification by means of asparaginase activity

Zhang

et al. 2015

Sci Rep

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Bio-grout, a new ground improvement method, has been recently developed to improve the mechanical properties, decrease the permeability of porous materials, reinforce or repair cementitious materials and modify the properties of soil or sand. Bio-grout production depends on microbially induced calcite precipitation (MICP), which is driven mainly by an enzyme, urease. However, urease-based MICP process produces excessive ammonia, in addition to secondary pollution generated by urea that is used as substrate in it. In the present study, we reported asparaginase-based MICP process for sand bio-grout development using Bacillus megaterium, and results were also compared with urease-based bio-grouts. The asparaginase activity led to significantly less ammonia production compared to urease without compromising with desired properties of a novel grout. The UCS of bio-grout was obtained at 980 kPa, while the permeability was decreased substantially. The mineralogical composition of precipitated substance was identified as calcite using XRD and the crystal morphology was observed under SEM. The mass percentage of calcite in bio-grout was calculated by thermogravimetric analysis and XCT verified calcite precipitation in it. The results confirmed that biocalcification by means of bacterial asparaginase is a potential solution for geotechnical problems. The asparaginase-based MICP process could be of wider acceptance in future.

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Effect of different sand grading on strength properties of cement grout

Cited by 54 publications

References 7 publications

Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates

Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates

Fibre-Reinforced Foamed Concretes: A Review

Bio-grout based on microbially induced sand solidification by means of asparaginase activity

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