Chen Xu, Beatty Danielle N, Matar Mohammad G, Cai Huanchun, Srubar Wil V
Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 1111 Engineering Drive ECOT 441 UCB 428, Boulder, Colorado 80309, United States.
School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
ACS Sustain Chem Eng. 2024 Feb 20;12(9):3585-3594. doi: 10.1021/acssuschemeng.3c06592. eCollection 2024 Mar 4.
Biochar can improve the mechanical properties of portland cement paste and concrete. In this work, we produced algal biochar-zinc (biochar-Zn) and algal biochar-calcium (biochar-Ca) nanocomposite particles and studied their effect on the hydration kinetics and compressive strength of cement paste. Results show that 3 wt % biochar-Zn delayed peak heat evolution during cement hydration from 8.3 to 10.0 h, while 3 wt % addition of biochar-Ca induced a minor acceleration of peak heat from 8.3 to 8.2 h. Both biochar-Zn and biochar-Ca nanocomposite particles increased the compressive strength of cement paste at 28 days by 22.6 and 17.0%, respectively. Data substantiate that retardation or minor acceleration of the reaction kinetics was due exclusively to the presence of Zn and Ca phases, respectively, while the enhanced strength was attributed to a nucleation effect induced by such phases and the internal curing effect of biochar.
生物炭可以改善波特兰水泥浆体和混凝土的力学性能。在本研究中，我们制备了藻类生物炭-锌（生物炭-Zn）和藻类生物炭-钙（生物炭-Ca）纳米复合颗粒，并研究了它们对水泥浆体水化动力学和抗压强度的影响。结果表明，3 wt%的生物炭-Zn将水泥水化过程中的峰值热释放时间从8.3小时延迟至10.0小时，而添加3 wt%的生物炭-Ca则使峰值热略有加速，从8.3小时提前至8.2小时。生物炭-Zn和生物炭-Ca纳米复合颗粒均使水泥浆体在28天时的抗压强度分别提高了22.6%和17.0%。数据证实，反应动力学的延迟或轻微加速分别完全归因于Zn相和Ca相的存在，而强度的提高则归因于这些相诱导的成核效应和生物炭的内部养护效应。
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