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The problem of utilizing substantial bamboo residual waste while also improving the quality of building composites was addressed by preparing bamboo scrap/magnesium oxychloride composites using bamboo scraps as a reinforcing material and magnesium oxychloride as a matrix. However, problems remain, such as poor interface compatibility and poor water resistance, which limit its application range. Herein, nano-silica (nSiO2) was found to build a crystal nucleus and a network structure in the composites, such that the bamboo scrap/magnesium oxychloride composites had higher mechanical properties and water resistance. In addition, the nSiO2 crystal nucleus structure promoted the composites hydration process, promoted the growth of the 5-phase crystals and the close arrangement of the cross, thereby improved composites strength. The nSiO2 build a network structure at composites interface, which improved the compatibility of composites interfaces, thus improving water resistance. At the same time, nSiO2 and the crystal nuclei adsorbed a portion of CO2 and CO, which had a certain hindering effect on the release of toxic gases in fire, and provided new ideas for fire safety protection. These results expanded the scope of application of building composites, which can be used in the fields of fireproof materials and building decoration materials, and provided a good solution for bamboo processing waste, thus making a certain contribution to green environmental protection.

This study was aimed to solve the problem of large waste from bamboo processing residues, improve the quality of building composites, give composites biological properties, and expand the use of composites. Highly efficient and excellent bamboo scrap/magnesium oxychloride composites were prepared, with homogeneous structure and chemical bonding constructed with magnesium oxychloride cementitious material as the raw material, bamboo scraps as reinforcement material, and polycarboxylate superplasticizer (PCE) as modifier. The influence of PCE addition on molding performance, mechanical performance, and water resistance of the resulting composites were examined and discussed. Scanning electron microscopy, X-ray diffractometry, and thermogravimetric analyses were used to characterize the microscopic morphology, crystal structure, and heat resistance of composites, respectively. The results showed that, when PCE addition was 0.3% (by vol), the fluidity of magnesium oxychloride slurries was conducive to composite molding, provided the best compressive strength, bending strength, and water resistance, and the composite performance observed to improve with extended storage time. In addition, with 0.3% PCE, the interface between bamboo scraps and the magnesium oxychloride matrix in the composite material was the best, showing more 5-phase crystals and the best heat resistance. This strategy not only improved the functionality of this kind of composite but also provided a good solution for the use of bamboo processing residues.

Epimedium elachyphyllum, which belongs to Berberidaceae, is only distributed in Guizhou province of China. In this study, the complete chloroplast (cp)genome of E. elachyphyllum was sequenced and assembled. The circular genome is 157,201 bp in length, which comprises of a large single-copy region (LSC, 88,519 bp), a small single-copy region (SSC, 17,042 bp), and a pair of inverted repeat regions (IRa and IRb, 25,820 bp). The genome of E. elachyphyllum contains 112 unique genes, of which 78 protein-coding genes, 30 tRNA genes, and four rRNA genes. Phylogenetic analysis based on 18 complete cp genome sequences indicated that E. elachyphyllum was closely related to E. dolichostemon.