The influence of the number of injections of bio-composite cement on the properties of bio-sandstone cemented by bio-composite cement. (10th March 2018)

• Record Type: Journal Article
• Authors: Yu, Xiaoniu; Qian, Chunxiang; Sun, Linzhu
• Is Part Of: Construction & building materials. Volume 164(2018)
• Page Start: 682
• Page End: 687
• Publication Date: 2018-03-10
• Subjects: Bio-sandstone -- Bio-composite cement -- Compressive strength -- Hydraulic conductivity -- Microstructure; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.01.014
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Ingredients and microstructure of the bio-sandstones have been analyzed. Defect volume of the bio-sandstones was characterized under different number of injections. The wind erosion rate of bio-sandstone has been tested. Abstract: Using bio-composite cement, loose sand particles can be aggregated into bio-sandstone with good mechanical strength. The average compressive strength, hydraulic conductivity, and porosity of bio-sandstone made with 6 injections of bio-composite cement were 1.33 MPa, 2.03 × 10 −2 cm/s, and 25.15%, respectively. The ingredients of the bio-sandstone, as determined through X-ray diffraction (XRD) analysis, were mainly quartz sand, MgNH4 PO4 (H2 O)6, and Mg5 (CO3 )4 (OH)2 ·4H2 O. Scanning electron microscopy (SEM) images of the bio-sandstone showed that the cementation products have an irregular flake morphology. The maximum defect volume of the bio-sandstone creating using 2, 4, and 6 injections of bio-composite cement was 1401 mm 3, 930 mm 3, and 738 mm 3, respectively. The internal microstructure of quartz sand, as observed by SEM, was found to be irregular spheres of 100–300 µm. The wind erosion rate of bio-sandstone created by spraying bio-composite cement on quartz sand 1 or 3 times was 0 g/m 2 /h, after 1 h of wind erosion.