Melichar Tomáš, Dufka Amos, Dvořák Karel, Bayer Patrik, Vasas Silvestr, Novakova Iveta, Schwarzova Ivana, Bydžovský Jiří
Institute of Technology of Building Materials and Components, Faculty of Civil Engineering, Brno University of Technology, 602 00 Brno, Czech Republic.
Institute of Chemistry, Faculty of Civil Engineering, Brno University of Technology, 602 00 Brno, Czech Republic.
Materials (Basel). 2024 Dec 23;17(24):6300. doi: 10.3390/ma17246300.
Limestone (LS) and stabilised secondary spruce chips (SCs) utilisation in wood-cement composites is still an unexplored area. Therefore, the main objective of the research presented here is the assessment of the long-term behaviour of cement-bonded particleboards (CBPs) modified by LS and SCs. Cement (CE) was replaced by 10% of LS, and spruce chips by 7% of SCs. The test specimens were stored in a laboratory and exterior environment (Middle Europe) for up to 2 years. The density, strength, and modulus of elasticity were evaluated after 28 days, and then in 6-month periods. The hygroscopicity was analysed separately. The mineralogical composition and microstructure were analysed due to possible LS participation during hydration. SC synergic behaviour in CBPs was also studied. After 2 years, the microstructure of the CBP was more compact, and denser. Strong carbonatation contributes to the improvement of CBP properties. The products of carbonatation were present in both the matrix and wood chips. The hydration of the matrix was almost finished. LS has a positive effect on the matrix microstructure development. LS acts both as an active component participating in the formation of the cement matrix structure and as an inert microfiller, synergic with hydration products. SCs have a positive effect on the hygroscopic behaviour of CBPs and slightly negative effect on the tensile strength.
在木材 - 水泥复合材料中使用石灰石(LS)和稳定化的次生云杉木片(SCs)仍是一个未被探索的领域。因此,本文所呈现研究的主要目的是评估由LS和SCs改性的水泥刨花板(CBPs)的长期性能。用10%的LS替代水泥(CE),并用7%的SCs替代云杉木片。测试样品在实验室和室外环境(中欧)中存放长达2年。在28天后,然后每隔6个月评估其密度、强度和弹性模量。单独分析吸湿性。由于水化过程中可能存在LS参与,对矿物组成和微观结构进行了分析。还研究了SCs在CBPs中的协同作用。2年后,CBP的微观结构更致密。强烈的碳酸化有助于改善CBP的性能。碳酸化产物存在于基体和木片中。基体的水化几乎完成。LS对基体微观结构的发展有积极影响。LS既作为参与水泥基体结构形成的活性成分,又作为与水化产物协同作用的惰性微填料。SCs对CBPs的吸湿行为有积极影响,对拉伸强度有轻微负面影响。