Effect of alkali-activated metakaolin cement on compressive strength of mortars

Wianglor, Kornnika; Sinthupinyo, Sakprayut; Piyaworapaiboon, Manow; Chaipanich, Arnon

doi:10.1016/j.clay.2017.01.025

Cited by 57 publications

(12 citation statements)

References 35 publications

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“…The reduction in porosity and capillarity decreases the occurrence of pathological manifestations, such as alkali aggregate reaction and penetration of aggressive agents, such as chlorides and sulphates, increasing the durability of concrete (Wianglor et al 2017). After the occurrence of pozzolanic reactions, less dense crystals of C-S-H are generated, filling the concrete voids and reducing the pores in the system, avoiding the penetration of agents (Tafraoui et al 2016).…”

Section: Properties Of Concrete With Metakaolinmentioning

confidence: 99%

Evaluation of compressive strength of concrete with metakaolin using different levelling techniques

Sá

Coutinho

Soares

et al. 2021

RSD

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The partial replacement of cement by mineral additions such as metakaolin has been widely applied in the production of high-strength and durable concretes due to the pozzolanic action, allowing a reduction in the consumption of cement. Tests are performed to determine the mechanical properties of these materials, such as compressive strength, for which there are different levelling techniques of specimens, such as sulphur and neoprene, indicated for different resistance classes. The present study aimed to characterize the behaviour, in the hardened state, of concrete produced with high initial strength Portland cement (CPV-ARI) and metakaolin and evaluate the different levelling methods. Three groups of samples dosed by the IPT-EPUSP method, with mix designs of 1:3, 1:5, and 1:6, and replacements of 8 and 10% of cement by metakaolin, were subjected to compressive strength test, at the ages of 28 days, with levelling by neoprene, and 90 days, with levelling by sulphur. It was observed an increase in strength with addition of metakaolin at both ages. Comparing the results in the two ages, it was verified an increase in strength for the mix designs 1:5 and 1:6 and a reduction for the mix design 1:3. Such fact can be explained by the high strengths achieved by this mix design. As the levelling method used was sulphur, it is confirmed the imprecision of results for strengths above 50 MPa with this technique.

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Section: Properties Of Concrete With Metakaolinmentioning

confidence: 99%

Evaluation of compressive strength of concrete with metakaolin using different levelling techniques

Sá

Coutinho

Soares

et al. 2021

RSD

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“…Portland cement production is a high energy demand process [ 1 , 2 ] that emits 900 kg CO 2 into the atmosphere per tonne of cement [ 3 ] which contributed to global warming and climate change. Therefore, in looking for ways to reduce CO 2 emissions associated with cement production [ 4 , 5 ] by the use of supplementary cementitious materials (SCM) to replace part of Portland cement [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of AISI 1018 Carbon Steel in Localized Repairs of Mortars with Alkaline Cements and Engineered Cementitious Composites

et al. 2020

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The selection of materials for repairs of reinforced concrete structures is a serious concern. They are chosen for the mechanical capacity that the repair mortar achieves. However, several important characteristics have been left aside, such as the adhesion of the repair mortar with the concrete substrate, the electrical resistivity and—hugely important—the protection against corrosion that the repair material can provide to the reinforcing steel. The aim of this work was to study the corrosion behavior of AISI 1018 carbon steel (CS) in mortars manufactured with alkaline cements, engineered cementitious composites (ECC), and supplementary cementitious materials (SCM). Two types of ordinary Portland cement (OPC) 30R and 40R were used. The constituent materials for the mortars with ECC mixture mortars they use OPC 40R, class F fly ash (FA), silica fume (SF) and polypropylene (PP) fibers. The sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) were used as activating agents in alkali activated cements. The reinforced specimens were immersed in two different electrolytes, exposed to a 3.5 wt % of NaCl and Na2SO4 solutions, for 12 months and their electrochemical behavior was studied by half-cell potential (Ecorr) and linear polarization resistance (LPR) according to ASTM C876-15 and ASTM G59-97, respectively. The results obtained indicated that, the mortar they have the best performance and durability, is the conventional MCXF mortar, with OPC 30R and addition of 1% polypropylene PP fiber improves the behavior against the attack of chlorides and sulfates.

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“…Compared with other supplementary cementitious materials, MK has many advantages, including higher activity, larger specific surface, and finer particle size [17]. Studies have emerged that offer contradictory findings about the effects of MK content on physical and mechanical properties of cement soil and concrete materials and acquired abundant accomplishment [15,16,[18][19][20][21][22][23]. Wu et al [15] studied the effect of MK contents on the strength performance of cement-modified soil, and test results reveal that both the unconfined compression and splitting tensile strengths are improved, and the suitable ratio of MK to cement ranges from 1/3 to 1/2.…”

Section: Introductionmentioning

confidence: 99%

Effects of Curing Time on the Mechanical Property and Microstructure Characteristics of Metakaolin‐Based Geopolymer Cement‐Stabilized Silty Clay

Zhang

2020

Advances in Materials Science and Engineering

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Metakaolin (MK), which has a fine particle size and higher activity in high alkaline environments, has been widely used in the fields of soil treatment engineering to stabilize soils. MK is used to replace part of ordinary Portland cement (OPC) with 0 : 15, 2 :13, 4 : 11 and 6 : 9 mass ratios of MK to OPC in this study. The mechanical property (e.g. stress-strain relationship, strength, and deformation performance) and microstructure characteristics of MK-based geopolymer cemented silty clay are investigated using unconfined compressive strength (UCS), nuclear magnetic resonance (NMR), and scanning electronic microscopy (SEM) tests. In addition, strength increase coefficient (ζs) and elasticity modulus increase coefficient (ζe) are defined to evaluate the effects of curing time on the mechanical property of MK-based geopolymer cemented silty clay. Moreover, the relationships among porosity, UCS, and E50 of MK-cemented silty clay are studied. By incorporating 2% MK, the UCS and E50 of MK-cemented silty clay at 28 d are 1.32 and 1.30 times compared with MK0 group, respectively. The increase rate of UCS and E50 from 1 d to 7 d is faster compared with that from 7 d to 28 d. Furthermore, the microstructure of the sample modified by 2% MK is most homogeneous and dense. Finally, the optimistic mass ratio between MK and cement is 2 : 13 for silty clay in this test condition.

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Effect of alkali-activated metakaolin cement on compressive strength of mortars

Cited by 57 publications

References 35 publications

Evaluation of compressive strength of concrete with metakaolin using different levelling techniques

Evaluation of compressive strength of concrete with metakaolin using different levelling techniques

Corrosion Behavior of AISI 1018 Carbon Steel in Localized Repairs of Mortars with Alkaline Cements and Engineered Cementitious Composites

Effects of Curing Time on the Mechanical Property and Microstructure Characteristics of Metakaolin‐Based Geopolymer Cement‐Stabilized Silty Clay

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