{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T12:48:57Z","timestamp":1792068537132,"version":"4.4.0"},"reference-count":30,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T00:00:00Z","timestamp":1718668800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100017596","name":"Natural Science Basic Research Program of Shaanxi Province","doi-asserted-by":"publisher","award":["2021JM-535"],"award-info":[{"award-number":["2021JM-535"]}],"id":[{"id":"10.13039\/501100017596","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100017596","name":"Natural Science Basic Research Program of Shaanxi Province","doi-asserted-by":"publisher","award":["23JS061"],"award-info":[{"award-number":["23JS061"]}],"id":[{"id":"10.13039\/501100017596","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Scientific Research Program Funded by the Education Department of Shaanxi Provincial Government","award":["2021JM-535"],"award-info":[{"award-number":["2021JM-535"]}]},{"name":"Scientific Research Program Funded by the Education Department of Shaanxi Provincial Government","award":["23JS061"],"award-info":[{"award-number":["23JS061"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>As an emerging repair method, the enzyme-induced calcium carbonate precipitation (EICP) technique has the advantages of being highly economical, eco-friendly, and durable. The optimal repair conditions were obtained by taking cement mortar as the research object, adding two types of filling medium, using three EICP-based repair methods to repair the cement mortar with different crack widths, and combining ultrasonic testing and strength testing to evaluate the mechanical properties and repair effects of the repair mortar. The microscopic structure of the mortar was established using mesoscopic and microscopic tests (XRD, SEM, and EDS), thereby revealing the mechanism of repair based on EICP. The test results show that, when quartz sand is used as the repair medium, more calcium carbonate adheres to the cross-section of test samples, and it has a better repair effect. Moreover, the repair effect of the injection method is significantly higher than those of the perfusion and immersion methods, and the ultrasonic wave transit time decreases by 1.22% on average. Based on the combination of quartz sand and EICP repair methods, the calcium carbonate precipitated among the sand granules contributes to a binding effect that strengthens the cohesive force among the sand granules.<\/jats:p>","DOI":"10.3390\/ma17122978","type":"journal-article","created":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T07:33:20Z","timestamp":1718696000000},"page":"2978","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Study on the Mechanical Properties of Crack Mortar Repaired by Enzyme-Induced Calcium Carbonate Precipitation (EICP)"],"prefix":"10.3390","volume":"17","author":[{"given":"Gang","family":"Li","sequence":"first","affiliation":[{"name":"Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi\u2019an 710123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deqiang","family":"Yan","sequence":"additional","affiliation":[{"name":"Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi\u2019an 710123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2392-6629","authenticated-orcid":false,"given":"Jia","family":"Liu","sequence":"additional","affiliation":[{"name":"Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi\u2019an 710123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peidong","family":"Yang","sequence":"additional","affiliation":[{"name":"Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi\u2019an 710123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6188-9750","authenticated-orcid":false,"given":"Jinli","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,6,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"132124","DOI":"10.1016\/j.conbuildmat.2023.132124","article-title":"Experimental evaluation of alkali-activated and portland cement-based mortars prepared using waste glass powder in replacement of fly ash","volume":"394","author":"Nodehi","year":"2023","journal-title":"Constr. Build. Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"11","DOI":"10.4028\/www.scientific.net\/KEM.747.11","article-title":"Numerical modelling of masonry barrel vaults reinforced with textile reinforced mortars","volume":"747","author":"Ramaglia","year":"2017","journal-title":"Key Eng. Mater."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"3","DOI":"10.20517\/mmm.2023.26","article-title":"A review of mechanical properties and carbonation behavior evolution of lime mortar for architectural heritages restoration","volume":"3","author":"Chen","year":"2024","journal-title":"Miner. Miner. Mater."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"210","DOI":"10.1016\/j.culher.2022.03.014","article-title":"Impact of nanosilica on lime restoration mortars properties","volume":"55","author":"Diaz","year":"2022","journal-title":"J. Cult. Herit."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"132968","DOI":"10.1016\/j.conbuildmat.2023.132968","article-title":"Influence of air entrainers on the properties of hydrated lime mortars","volume":"403","author":"Vasconcelos","year":"2023","journal-title":"Constr. Build. Mater."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"117753","DOI":"10.1016\/j.conbuildmat.2019.117753","article-title":"Experimental evaluation of concrete-to-UHPC bond strength with correlation to surface roughness for repair application","volume":"238","author":"Valikhani","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"107653","DOI":"10.1016\/j.jcsr.2022.107653","article-title":"Design of concrete-filled steel tubular columns using data-driven methods","volume":"200","author":"Degtyarev","year":"2023","journal-title":"J. Constr. Steel Res."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"130991","DOI":"10.1016\/j.conbuildmat.2023.130991","article-title":"A comprehensive review of cementitious grouts: Composition, properties, requirements and advanced performance","volume":"375","author":"Ferrara","year":"2023","journal-title":"Constr. Build. Mater."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"107100","DOI":"10.1016\/j.jobe.2023.107100","article-title":"Effect of using nano-silica on the rheological, fresh and strength characteristics of cement-based grout for grouting columns","volume":"76","author":"Yetim","year":"2023","journal-title":"J. Build. Eng."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Hang, L., Yang, E., Zhou, Y., Song, W., and He, J. (2022). Microbially induced calcite precipitation (MICP) for stabilization of desert sand against the wind-induced erosion: A parametric study. Sustainability, 14.","DOI":"10.3390\/su141811409"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"121540","DOI":"10.1016\/j.seppur.2022.121540","article-title":"Removal of Cd2+ from wastewater by microorganism induced carbonate precipitation (MICP): An economic bioremediation approach","volume":"297","author":"Song","year":"2022","journal-title":"Sep. Purif. Technol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"840","DOI":"10.1016\/j.sandf.2020.05.012","article-title":"Freeze-thaw durability and shear responses of cemented slope soil treated by microbial induced carbonate precipitation","volume":"60","author":"Gowthaman","year":"2020","journal-title":"Soils Found."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Almajed, A., Lateef, M.A., Moghal, A.A.B., and Lemboye, K. (2021). State-of-the-art review of the applicability and challenges of microbial-induced calcite precipitation (MICP) and enzyme-induced calcite precipitation (EICP) techniques for geotechnical and geoenvironmental applications. Crystals, 11.","DOI":"10.3390\/cryst11040370"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1007\/s12665-023-10899-y","article-title":"Microbial-induced carbonate precipitation (MICP) technology: A review on the fundamentals and engineering applications","volume":"82","author":"Zhang","year":"2023","journal-title":"Environ. Earth Sci."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1011","DOI":"10.1016\/j.jrmge.2022.06.012","article-title":"Field implementation of enzyme-induced carbonate precipitation technology for reinforcibedding layer beneath an underground cable duct","volume":"15","author":"Xu","year":"2023","journal-title":"J. Rock Mech. Geotech. Eng."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"6007","DOI":"10.1007\/s11440-023-02008-x","article-title":"Evaluation of liquefaction resistance for single- and multi-phase SICP-treated sandy soil using shaking table test","volume":"18","author":"Zhou","year":"2023","journal-title":"Acta Geotech."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"106374","DOI":"10.1016\/j.enggeo.2021.106374","article-title":"Multiple-phase enzyme-induced carbonate precipitation (EICP) method for soil improvement","volume":"294","author":"Meng","year":"2021","journal-title":"Eng. Geol."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"04021373","DOI":"10.1061\/(ASCE)MT.1943-5533.0004009","article-title":"Enzyme-induced carbonate precipitation combined with polyvinyl alcohol to solidify aeolian sand","volume":"33","author":"Wu","year":"2021","journal-title":"J. Mater. Civ. Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"16206","DOI":"10.1007\/s11356-023-31555-9","article-title":"A mini review of enzyme-induced calcite precipitation (EICP) technique for eco-friendly bio-cement production","volume":"31","author":"Kidanemariam","year":"2024","journal-title":"Environ. Sci. Pollut. Res."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1007\/s11440-020-01043-2","article-title":"One-phase-low-pH enzyme induced carbonate precipitation (EICP) method for soil improvement","volume":"16","author":"Cui","year":"2021","journal-title":"Acta Geotech."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Zomorodian, S.M.A., Nikbakht, S., Ghaffari, H., and O\u2019Kelly, B.C. (2023). Enzymatic-induced calcite precipitation (EICP) method for improving hydraulic erosion resistance of surface sand layer: A laboratory investigation. Sustainability, 15.","DOI":"10.3390\/su15065567"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1680\/jgeot.22.00329","article-title":"Characteristics of MICP- and EICP-treated sands in simple shear conditions: A benchmarking with the critical state of untreated sand","volume":"12","author":"Ahenkorah","year":"2023","journal-title":"G\u00e9otechnique"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"101035","DOI":"10.1016\/j.apmt.2021.101035","article-title":"An enzymatic self-healing cementitious material","volume":"23","author":"Rosewitz","year":"2021","journal-title":"Appl. Mater. Today"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"190","DOI":"10.1520\/GTJ20210247","article-title":"The investigation of the mechanical properties of EICP-Treated sand specimens prepared by a double-reservoir injection system for uniform precipitation of carbonate via triaxial tests","volume":"46","author":"Lee","year":"2023","journal-title":"Geotech. Test. J."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"146","DOI":"10.1016\/j.culher.2022.01.016","article-title":"Application of improved enzyme induced calcium carbonate precipitation (EICP) technology in surface protection of earthen sites","volume":"54","author":"Dong","year":"2022","journal-title":"J. Cult. Herit."},{"key":"ref_26","first-page":"2222","article-title":"Implication and enhancement mechanism of chitosan-assisted enzyme- induced carbonate precipitation for copper wastewater treatment","volume":"73","author":"Xu","year":"2022","journal-title":"CIESC J."},{"key":"ref_27","first-page":"22100028-23","article-title":"A review of some key technologies and methods used for evaluating the healing performance of self-healing concrete","volume":"38","author":"Zhang","year":"2024","journal-title":"Mater. Rep."},{"key":"ref_28","first-page":"438","article-title":"Extraction and partial purification of urease enzyme from Jack fruit","volume":"9","author":"Chouhan","year":"2018","journal-title":"Int. J. Res. Pharm. Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.cemconcomp.2018.06.015","article-title":"Experimental investigation of compressive strength and compressive fracture energy of longitudinally cracked concrete","volume":"93","author":"Nakamura","year":"2018","journal-title":"Cem. Concr. Compos."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"129724","DOI":"10.1016\/j.conbuildmat.2022.129724","article-title":"Influence of injection methods on calcareous sand cementation by EICP technique","volume":"363","author":"Zhang","year":"2023","journal-title":"Constr. Build. 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