Fig. 6From: Agricultural by-products and oyster shell as alternative nutrient sources for microbial sealing of early age cracks in mortarMeasurement of crack-healing rates of mortar specimens treated with SN. a–d The decreasing crack width in specimens treated with SN once a day. An asterisk (☆) indicates cracks that were healed completely. e Progression of calcium carbonate precipitation in cracks with daily SN treatmentBack to article page