Comparison of technical properties of cement pastes with different activated recycled powder from construction and demolition waste

Meng, Tao; Hong, Yongpeng; Ying, Kanjun; Wang, Zhongjia

doi:10.1016/j.cemconcomp.2021.104065

Cited by 67 publications

(19 citation statements)

References 44 publications

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“…This well contributes to the existing studies showing changed properties of cement mortar with addons, e.g. alkali-activated slag, alkaline resistant glass fabric, ash in various proportions or reinforced concrete [63][64][65][66][67][68].…”

Section: Introductionsupporting

confidence: 61%

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Resonant Frequency Ultrasonic P-Waves for Evaluating Uniaxial Compressive Strength of the Stabilized Slag–Cement Sediments

Lindh

Lemenkova

2021

Nordic Concrete Research

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Marine sediments can be stabilized by ultra high-strength binders: cement, Cement Kiln Dust (CKD) and slag. The properties of the stabilized soil indicate potential to their reuse. This study investigated the performance of the unconfined compressive strength (UCS) in the marine sediments stabilized by binder (cement, CKD, slag), tested by ultrasonic P-waves. Materials include 194 specimens collected from the port of Gothenborg. The experiment was performed in Swedish Geotechnical Institute (SGI). The UCS of specimens stabilized by different ratio of binders (cement, CKD, slag) was tested by resonance frequencies of the elastic P-waves. The significant increase in the UCS (>1500 kPa) was recorded for the highest values of CKD and cement, and low values of slag. The correlation profiles of low water/high binder (LW/HB) cement/slag (40/60%) were controlled by curing time. The slag–cement–CKD simplex tests demonstrated UCS of samples with low/high water content and various binder ratio of cement (kg/m3). The ratio of cement binder and curing time play a critical role in the increase of UCS followed by mechanical properties of specimens and intensity of stress. The highest values exceed 1000 m/s in P-waves. The results shown high accuracy (97%) and non-contacting approach for testing UCS of sediments. Seismic methods can be applied to test the UCS of the stabilized sediments, and also in-situ via seismic CPT, surface testing or cross hole seismic testing.

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Section: Introductionsupporting

confidence: 61%

“…Resonant frequency testing of the compressive strength, compared to the traditional methods in civil engineering [76][77] is non-destructive and environmentally sustainable approach. Seismic measurements are based on the remote sensing principles using geophysical properties of materials [66][67][68][69][78][79][80][81].…”

Section: Introductionmentioning

confidence: 99%

Resonant Frequency Ultrasonic P-Waves for Evaluating Uniaxial Compressive Strength of the Stabilized Slag–Cement Sediments

Lindh

Lemenkova

2021

Nordic Concrete Research

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“…To investigate the evolution law of these different particles' sizes and content with recycled materials on the mechanical and dry shrinkage properties of CSCA with recycled materials, RBCP, RBCFA (2.36∼4.75 mm), and RBCCA (4.75∼9.5) are selected as three factors while ensuring that the amount of aggregate with other particle sizes remains unchanged. To maximize the use of brick aggregate, the mixed recycled coarse aggregate and mixed recycled fine aggregate are prepared, and the mass ratio of the recycled brick to the concrete is 3 : 2, according to the previous research results [4,7,35]. e mixed recycled micropowder is composed of brick powder, concrete powder, and fly ash with a mass ratio of 3 : 2 : 5 and added 3% activator Na 2 SO 4 [8,35].…”

Section: Experimental Designmentioning

confidence: 99%

“…e main reason is that its performance is poor, and its particle size is large. erefore, many researchers began to study the preparation of more delicate recycled powder [4][5][6]. In recent years, with the increasing engineering demand, the method of developing auxiliary cementitious materials has been widely concerned.…”

Section: Introductionmentioning

confidence: 99%

“…Standard methods include the thermal process, physical form, chemical method, etc [6,7]. Because of its fineness and potential reactivity, a lot of pure and application-oriented fundamental research was conducted to scientifically and technologically support RBCP to replace partial Portland cement as a road base in recent years [4,7,8]. In an investigation by Xiao et al [9], after recycled concrete micropowder replaces the part of Portland cement, it could promote hydration reaction.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Effects of Recycled Micropowder and Aggregate on the Properties of Cement Stabilization of Crushed Aggregate (CSCA)

Deng

Xie

Wang

et al. 2022

Advances in Materials Science and Engineering

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The recycled powder produced in the process of crushing concrete and brick waste (C&BW) into recycled aggregate will cause environmental pollution. To realize the green full recycling of concrete and brick waste, the cement stabilization of crushed aggregate (CSCA) containing recycled brick-concrete composite micropowder (RBCP) and recycled brick-concrete composite aggregate (RBCA) is proposed. In this paper, RBCP, recycled brick-concrete composite fine aggregate (RBCFA), and recycled brick-concrete composite coarse aggregate (RBCCA) were the recycled materials from C&BW. The orthogonal test table was used to analyze the effects of the three recycled materials on the compaction characteristics, mechanical properties, and shrinkage behavior of CSCA at different dosages. The effects of RBCP, RBCCA, and RBCFA on the properties of CSCA are studied by variance analysis methods. On this basis, the micromorphology and the interface transition zone (ITZ) were studied for CSCA and the cement stabilization of crushed aggregate with RBCP, RBCFA, and RBCCA through scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), and the mechanism was revealed. The results indicate that the addition of RBCP and RBCA can increase the optimal water content while decreasing the optimal dry density of CSCA, and the influence of RBCCA on the optimal water content is greater than that of RBCFA. Three optimal composite replacement systems for CSCA, including 20% RBCP/20%RBCFA/40%RBCCA, are proposed and have the best mechanical and antishrinkage performance through the range analysis. Furthermore, the variance analysis test results show that RBCCA and RBCFA have the most significant effect on the compressive strength and shrinkage strain properties, while RBCP has the most significant effect on the bending tensile strength. It is found that RBCP played a filling effect and pozzolanic activity in the strength formation of CSCA. The SEM/EDS test shows that the CSCA with recycled materials produced the Ca/Si ratio in the interfacial zone between the cement paste and aggregate lower than the CSCA without recycled materials, the largest decline 52.83%. The research results of this paper can provide the potential application of RBCP and RBCA.

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Study on the activity, phase, thermal decomposition characteristics, microstructure, and chemical element of hardened cement powder under heating temperature of 100°C~1200°C

Ge,

Song,

Quan

et al. 2024

Structural Concrete

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The properties of thermoactivated hardened cement powder (HCP) are of great significance for the recycling and utilization of concrete waste. This paper focuses on heating activation of HCP under the temperature between 100 and 1200°C. The activity, phase changes and microstructure of thermoactivated HCP were analyzed. The results showed that HCP with heating temperature between 1000 and 1200°C showed high activity. Under the conditions of heating activation at 1200°C, water–binder ratio of 0.38 and curing time of 30 days, the compressive strength of the specimen made of HCP reached 17.56 MPa. When the heating temperature is between 700 and 1200°C, CSH gel is gradually decomposed into C2S and C3S. The chemical reaction products of cement and thermoactivated HCP are similar, both containing CaCO3, Ca(OH)2, AFt, Hydrotalcite, etc. Compared to the diffraction peaks of hydrated cement, the diffraction peaks of thermoactivated HCP are broadened and dispersed. The high Ca/Si and Al/Si ratios in the chemical reaction products of thermoactivated HCP are important reasons for the decrease in its mechanical properties.

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Comparison of technical properties of cement pastes with different activated recycled powder from construction and demolition waste

Cited by 67 publications

References 44 publications

Resonant Frequency Ultrasonic P-Waves for Evaluating Uniaxial Compressive Strength of the Stabilized Slag–Cement Sediments

Resonant Frequency Ultrasonic P-Waves for Evaluating Uniaxial Compressive Strength of the Stabilized Slag–Cement Sediments

Investigating the Effects of Recycled Micropowder and Aggregate on the Properties of Cement Stabilization of Crushed Aggregate (CSCA)

Study on the activity, phase, thermal decomposition characteristics, microstructure, and chemical element of hardened cement powder under heating temperature of 100°C~1200°C

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