Effect of vacuum mixing and curing conditions on mechanical properties and porosity of reactive powder concretes

Zdeb, Tomasz

doi:10.1016/j.conbuildmat.2019.03.116

Cited by 28 publications

(8 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, the results show that the contribution of the HAC to the strength was more apparent for the compressive strength as opposed to the flexural strength. These findings are in line with the majority of the studies in the literature which studied the effect of thermal and hydrothermal curing regimes [ 12 , 30 , 31 ]. The results of Figure 6 a,b show that the strength of hot air cured specimens was higher than that of the water cured specimens for all mixes with an increase ranging mostly from 6% to 14%.…”

Section: Resultssupporting

confidence: 90%

Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

et al. 2021

View full text Add to dashboard Cite

The use of different sustainable materials in the manufacture of ultra-high-performance concrete (UHPC) is becoming increasingly common due to the unabating concerns over climate change and sustainability in the construction sector. Reactive powder concrete (RPC) is an UHPC in which traditional coarse aggregates are replaced by fine aggregates. The main purpose of this research is to produce RPC using dune sand and to study its microstructure and mechanical properties under different curing conditions of water curing and hot air curing. The effects of these factors are studied over a long-term period of 90 days. Quartz sand is completely replaced by a blend of crushed and dune sand, and cement is partially replaced by using binary blends of ground granulated blast furnace slag (GGBS) and fly ash (FA), which are used alongside silica fume (SF) to make a ternary supplementary binder system. Microstructural analysis is conducted using scanning electron microscopy (SEM), and engineering properties like compressive strength and flexural strength are studied to evaluate the performance of dune sand RPC. Overall, the results affirm that the production of UHPC is possible with the use of dune sand. The compressive strength of all mixes exceeded 120 MPa after 12 h only of hot air curing (HAC). The SEM results revealed the dense microstructure of RPC. However, goethite-like structures (corrosion products) were spotted at 90 days for all HAC specimens. Additionally, the use of FA accelerated the formation of such products as compared to GGBS. The effect of these products was insignificant from a mechanical point of view. However, additional research is required to determine their effect on the durability of RPC.

show abstract

Section: Resultssupporting

confidence: 90%

Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Basalt fiber polymer-modified reactive powder concrete (RPC) is considered to be an innovative high property cement-based concrete material prepared by the theory of densified particle packing [ 1 , 2 , 3 , 4 ]. Basalt fiber polymer-modified RPC replaces the coarse aggregate in ordinary concrete with millimeter-level aggregate (quartz sand) and fills the gaps between quartz sand aggregates with micron-sized cementitious materials (cement) and submicron-sized cementitious materials (silica fume) [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Structural Design Calculation of Basalt Fiber Polymer-Modified RPC Beams Subjected to Four-Point Bending

Gong

Yang

et al. 2021

Polymers

View full text Add to dashboard Cite

In this paper, a basalt fiber surface was treated with coupling agent KH-550 and hydrochloric acid, and the basalt fiber polymer-modified active powder concrete (RPC) material was prepared. There are significant differences in material composition and properties between basalt fiber polymer-modified RPC and ordinary concrete, and the structural design calculation (cracking moment and normal section bending bearing capacity) of an ordinary reinforced concrete beam is no longer applicable. Thus, mechanical parameters such as displacement and strain of reinforcement basalt fiber polymer-modified RPC beams subjected to four-point bending were tested. The excellent compressive and tensile strengths of basalt fiber polymer-modified RPC were fully utilized. The tensile strength of basalt fiber polymer-modified RPC in the tensile zone of the beam was considered in the calculation of normal section bending bearing capacity of reinforcement basalt fiber polymer-modified RPC beams. The results showed that the measured values of the cracking moment and ultimate failure bending moment of reinforcement basalt fiber polymer-modified RPC beams were in good agreement with the calculated values. The established formulas for cracking moment and normal section bending bearing capacity can provide references for the design of reinforcement basalt fiber polymer-modified RPC simply supported beam and promote the wide application of basalt fiber polymer-modified RPC materials in practical engineering.

show abstract

“…In lines 7–10, our own mixture proportions are shown. The average differences in the experimental results in relation to the design results for individual publications are [ 22 ]—3.7%; [ 6 ]—6.7%; [ 32 ]—3.7%; [ 26 ]—12.3%; [ 4 ]—5.64%; and [ 3 ]—4.34% without taking into account the last column in Figure 2 and 6.65% with it for [ 3 ]. The difference in the result in the last column is 18%, but this batch should be retested, because UHPC4 [ 3 ] differs from the previous UHPC3 [ 3 ] recipe in that the water content is 2% lower, while the amount of superplasticizer is 0.18% higher [ 3 ].…”

Section: Resultsmentioning

confidence: 99%

“… Compressive strength of concrete—experimental results taken from literature [ 3 , 4 , 6 , 22 , 26 , 32 ] vs. estimations based on the modified formula. …”

Section: Figurementioning

confidence: 99%

“…In addition to the many factors mentioned above, the curing conditions are important. The effects of the vacuum mixing and curing conditions are presented, among others, in [ 21 , 22 , 23 , 24 ]. The use of curing conditions at elevated temperatures and pressure increases the early strength parameters, mainly by reducing the content of air pores and accelerating the binding reaction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modified Formula for Designing Ultra-High-Performance Concrete with Experimental Verification

2020

View full text Add to dashboard Cite

The main purpose of the study was to propose a modification of Larrard’s formula for both the design and compressive-strength evaluation of ultra-high-performance concrete. The proposed modification consisted of the introduction of new parameters into the original formula that allowed it to consider the amount of binders and fine-grained aggregates, the amount of reinforcing fibers, the specimen shape and size, the curing time, and a reinterpretation of the water/cement ratio. The proposed modification was verified based on comparative analysis with the results of our own experimental studies and results taken from the literature. A very good convergence of these results was demonstrated, indicating the validity of the proposed modification.

show abstract

Effect of vacuum mixing and curing conditions on mechanical properties and porosity of reactive powder concretes

Cited by 28 publications

References 38 publications

Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

Structural Design Calculation of Basalt Fiber Polymer-Modified RPC Beams Subjected to Four-Point Bending

Modified Formula for Designing Ultra-High-Performance Concrete with Experimental Verification

Contact Info

Product

Resources

About