Abstract
It is well known that organic waste materials deteriorate the performance of concrete. The impregnation of organic aggregates and their application in combination with other chemical admixtures and mineral additives are used in order to improve the concrete properties in case of their modification by organic components. The current research is focused on the evaluation of impact of multi-walled carbon nanotubes (MWCNT) on the properties of cement systems prepared based on wood sawdust extract (WSE). The setting time, density, consistency, flexural and compressive strength, water absorption tests were undertaken. The retardation effect of (WSE) on the initial and final setting time of cement paste was observed. The additional modification of cement paste with WSE by MWCNT in the dosage of 0.005% by weight of cement (bwoc) did not show the significant changes in initial and final setting time. The application of MWCNT in the dosage of 0.005% bwoc contributed to the increase of early strength of cement mortar prepared with WSE.
Highlights
The problem of the utilization of waste materials is becoming more relevant from year to year caused by industrial growth
The initial setting time of cement pastes prepared with wood sawdust extract (WSE) water (SDW) increased by 20 min in comparison with cement pastes based on potable water (PW)
The following conclusions are drawn in this study: 1. The initial setting time of cement pastes with wood sawdust extract increased by 20 min in comparison with the reference sample prepared based on potable water
Summary
The problem of the utilization of waste materials is becoming more relevant from year to year caused by industrial growth. The authors of the research Boltryk et al (2018) highlight the ability of organic materials to absorb carbon dioxide from the atmosphere. They established that the usage of mineralized organic aggregates such as common reed and conifer sawdust leads to the increase of the calcium carbonate by 45% in comparison to reference samples. In the course of the current research, the effect of multi-walled carbon nanotubes (MWCNT) on the cement paste and mortar based on wood sawdust extract (WSE) was studied through setting time, consistency, density, strength and water absorption tests
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