Cement Slab Research Articles

Transfer learning for probabilistic localization of hidden cracks in concrete structures

AbstractThe utility of discriminative supervised learning models built using multiple training-data sources is investigated for hidden crack localization in concrete. Feed-forward neural network (FFNN) is chosen as the model architecture, and transfer learning is used to assimilate the information obtained from different sources (computational physics simulations and laboratory experiments). The labeled training data consists of values of a damage index and the known locations of hidden cracks. The classification models need to learn how the presence of damage (hidden cracks) affects the damage index at different sensors for different test conditions. To this end, diagnostic FFNN models are built by sequentially adding and training new hidden layers to assimilate labeled information from computer models (different model geometries, test conditions, crack lengths, crack locations) and laboratory experiments on a plain cement slab. These transfer learning-based models are then used to localize damage in concrete specimens that reflect real-world conditions (i.e., specimens with steel reinforcement and randomly distributed aggregate). The actual damage state in these specimens is determined by extracting cores and performing petrographic studies on the extracted cores. The damage probability estimated by transfer learning-based models is compared with the petrographic damage rating index (DRI) to identify the most suitable approach to train the diagnostic models. The transfer learning-based diagnostic methodology shows promise and could be used in various structural health monitoring applications, where sufficient labeled data are typically not available from a single data source.

Characterization of microbial communities in the sewage of a major urban drain

ABSTRACT Diverse bacterial assemblages were identified in a large, open stormwater drain (vernacular: nalah) built decades ago in a densely populated suburb of Delhi, India. Illumina-based next-generation sequencing (NGS) of 16S rRNA gene amplicons was conducted with metagenomic DNAs isolated from influent sewage water and sediment samples collected from Sahibabad drain, which now carries domestic and industrial wastes to downstream sewage treatment plants. Results are discussed with respect to diversity and adaptation to unique ecological niche(s) in these drains as well as the prevalence of potentially pathogenic bacteria. Recently, it has become a common practice to cover such drains with thick cement slabs to facilitate the construction of residential/commercial complexes. However, the impact of concrete covers on microbial communities that inhabit the Sahibabad drain is unknown. Results indicated that open drains with better aeration and exposure to sunlight contained microbes that likely enhance biodegradation in sewage water. The deposition of sediments along the course of the drain was dominated by methanogenic and sulphidogenic bacteria. Covering of the drain may have contributed to an increased abundance of anaerobic pathogens which settled in sediments and/or resuspended into sewage water. Such findings are important as the microbes active in sewage can impact public health and drain infrastructure.

Mechanical Response and Anti-Reflective Crack Design in New Asphalt Overlays on Existing Asphalt Overlaying Composite Portland Cement Pavement

A detection and evaluation system containing a two-level index of structural integrity and bearing capacity was constructed based on ground-penetrating radar (GPR) and a falling weight deflector (FWD). This system was constructed to solve problems with the detection, evaluation, and structural and material design of asphalt rehabilitation for the prevention and control of asphalt reflection cracks in asphalt overlaying composite Portland cement pavement. Based on the detected data from the GPR and FWD, the reasonable and recommended thickness range of the stress-absorbing layer was determined by the finite element method, and the optimization design of an anti-reflective crack structure is proposed. Furthermore, a material design and engineering application of the stress-absorbing layer was carried out. The results show that an additional 10 cm layer of repaved asphalt can reduce temperature stress by 64.1%, reduce fatigue stress by 29.3% at the cement slab bottom, and extend the service life by 23.1 years. The reasonable thickness of the stress-absorbing layer ranges from 1.6 cm to 2.0 cm, and the recommended structural combination design is a 4 cm SMA-13 upper layer, a 4 cm AC-16 lower layer, and a 2 cm stress-absorbing layer overlaying existing asphalt overlay. The impact toughness of the designed stress-absorbing layer is 1.05 times and 1.44 times that of the other stress-absorbing layer and the AC-16 asphalt mixture, respectively, which have been successfully used for more than 5 years. The recommended design rehabilitation has good engineering application. The uniformity of the stress-absorbing layer can reach 63%, and an anti-reflective crack effect is expected. The results of this study provide design methodology and experience for composite pavement repaving.

Evaluation of the durability of cementicious composites reinforced with natural vegetable fibers from the Amazon

The study of the use of plant fibers as reinforcement for cementitious composites has become increasingly common in recent years, thanks to the advancement of technologies and the demand for innovative and sustainable materials. In the Amazon, this resource is widely found and used for different applications, and the present work is interested in evaluating the use of these fibers as structural reinforcement of cement slabs. The mechanical and durability properties of cementitious composites reinforced with a content of 5% vegetable fibers from jute (Corchorus capsularis) and mallow (Urena lobata L.) were investigated. The objective was to evaluate the quality and performance of these fibers as reinforcement of cementitious plates for a possible use of these composites in Civil Construction. Spreading and thermogravimetry tests were carried out on the matrix and tensile tests in flexion at 4 points on the composites. The results obtained indicated that the fibers provided an increase in the flexural strength and toughness of the composites, as well as the use of metakaolinite as a pozzolanic material, contributed to increasing the durability of these composites, indicating a great possibility of using them in structural and semi-structural applications.

TRICHO-COMPOSTING OF CROP RESIDUES WITH EASILY PRODUCED T. HARZIANUM LIQUID INOCULUMS

This study aimed to develop a rapid composting method using Trichoderma harzianum culture of liquid state. Assessment of physico-chemical properties and nutritional qualities of composted crop residues generated by Tricho-composting is another concern. Different types of crop residues (Rice straw, Sugarcane bagasse, Black gram straw, and Mustard straw) were composted with T. harzianum IMI 392432 in a randomized block design with three replications. Composting was conducted in cement slabs, maintaining a pH range of 6.55 to 7.40. Temperature peaked at 10°-15°C during thermophilic activity before declining. Moisture content decreased gradually, with 15-20% retained in the finished compost. Weight loss ranged from 40.50% to 51.60%, and decomposition time varied from 67.33 to 96.00 days wherein mustard straw decomposed fast. Sugarcane bagasse decomposed slowly and black gram residues decomposed faster despite having less carbon. Mustard straw exhibited significant weight loss though their carbon content was abundant initially. Despite carbon losses in time, sugarcane bagasse and rice straw retained their properties longer than other residues. The highest phosphorus and potash content found with the decomposed residues of sugarcane in the treatment T2. The treatment of T4 comprise mustard straw showed the lowest phosphorus content and their potash content was 0.19 % which is non-significant with lowest potash containing rice straw generated compost. Easily produced Trichoderma harzianum liquid inoculums accelerated the composting process in accordance with their C:N ratio demonstrating its potential for efficient management of crop residues.

Системы огнезащиты стальных конструкций с цементными плитами и противопожарным барьером при криогенном и Jet-Fire воздействиях

Purpose. The article presents the outcomes of experimental studies of steel structures samples with fire protection systems based on cement binder under cryogenic and hydrocarbon Jet-Fire exposure. Methods. Experimental studies of the fire protection system for steel structures with cement slabs and a fire barrier under cryogenic exposure were carried out according to the methodology, the main provisions of which are harmonized with ISO 20088-1 “Determination of the resistance to cryogenic spillage of insulation materials - Part 1: Liquid phase”, and samples of the system fire protection tested according to the method harmonized with ISO 22899-1 “Determination of the resistance to jet fires of passive fire protection materials. Part 1: General requirements”. Findings. Tests on cryogenic impact on a fire protection system sample consisting of Prozask Firepanel slabs on a cement binder, a fire protection mat Ignis-mat SV and a fire barrier Promizol-DSH Proplate-60/5/10L, made it possible to come to the conclusion based on the results of a 60-minute exposure to hydrocarbon Jet-Fire, that the temperature on the sample on an unheated surface reached 47.73 °C; during cryogenic exposure, the temperature on the sample reached –49 °C after 53 minutes. Research application field. The outcomes obtained can be applied when planning fire protection in the field of fire safety at oil and gas facilities and in tunnel structures as well. Conclusions. It has been found out that fire-retardant boards with a cement binder are quite effective under cryogenic exposure to hydrocarbons; they also show high resistance to hydrocarbon Jet-Fire in a system with a fire barrier made of superthin basalt fiber and a fire-retardant ceramic mat.

The first large-scale indoor tropical garden with Brazilian native tree species: Challenges and lessons

This commentary reports the challenges faced and lessons learned during the formation of the first large-scale tropical garden inside a building with native tree species in Brazil. This garden, set entirely over cement slab, is inside the Albert Einstein Education and Research Center (AEERC) – Campus Cecília and Abram Szajman in São Paulo city, and comprises 11 tree species, ten of which are native to the Atlantic Forest. The indoor environment, in the shape of an atrium, is controlled and isolated from the external environment, which imposes a unique and new habitat for those tree species, especially considering that this garden is shared with people during their daily activities. Over one year, we followed the growth and development of 95 trees and noticed that the acclimation potential varied among species as well as the susceptibility to pest and disease outbreaks and low temperature (due to an imbalance in the air conditioning system), which were identified as the main limiting factors. Among the species monitored, Lafoensia glyptocarpa was the most sensitive to mites, aphids and mealybugs, and effective and rapid phytosanitary management was crucial for maintaining a healthy garden. Aspidosperma polyneuron, Eriotheca candolleana, Holocalyx balansae, Poecilanthe parviflora and Euterpe edulis were the species with the most acclimation potential to the new environment, which was based on leaf area development. On the other hand, poor acclimation was observed for Calycophyllum spruceanum, which was replaced two years after the initial planting. As an important lesson, continuous monitoring of both plants and the environment is needed to enhance our knowledge and management of indoor tropical gardens.

Effect of 3D laser point spacing on cement concrete crack width measurement

The objective of this paper is to examine the reliability of three-dimensional (3D) laser detection technology data density for crack width detection results of cement slabs. Four groups of cement concrete crack elevation data with a laser data density of 0.5–1.5 mm were obtained using an indoor 3D laser detection system, and 3D models were established. The nonlinear least squares method was applied to fit the fracture section, and the crack width was determined by the peak value analysis. The results demonstrate that the lateral spacing of laser points exerts a large impact on the mean and discrete degrees of cement concrete crack width detection results. The laser point spacing is positively correlated with crack identification errors. Insufficient laser accuracy leads to an overestimation of crack severity level and affects the accuracy of pavement damage condition evaluation. High-precision laser equipment exhibits certain reliability for detecting cement concrete crack width above 3 mm. In the actual pavement crack width detection process, the appropriate transverse spacing of laser points can be selected according to different error limit requirements to fulfill the requirements of both detection reliability and data processing efficiency. Suggestions for future research include expanding the experimental conditions, increasing the 3D laser point spacings, and selecting more road lanes and pavement materials to further examine the influential factors of pavement crack width measurement.

The Lice, and: Scythe, and: Double Occupancy, and: Devotional

The Lice, and: Scythe, and: Double Occupancy, and: Devotional Marlo Starr (bio) The Lice The first event is known to have been an expulsion, and the last is hoped to be a reconciliation and return. —Marilynne Robinson, Housekeeping Our story begins with an expulsion. Mom swivelsto count and recount the milling brood. Us,sticky and slick with shampoo. See, I'm just below,on the back porch, crouched between her knees,my bright scalp bared for the biteof the comb. The boys launch cicadas onto the roof,the girls mock-scold, their heads lacquered whiteto drown the new colonies. Except for J who propsthe Children's Bible against the freezer boxto study its pictures: a sword bars the gardenwith orange flames, fig-leafed Adam and Eveclutch each other at the gates. J drops the tomeon the cement slab where cloudy drops pool.I try to make out the teeming multitude.Mom holds the comb for me to see:"You needed proof?" [End Page 13] Scythe There is a diagram imprinted in me,a first-tooth memory, my early phantomroot. I'd like to hold myself againstits hard edge, to arrange the giveand sag of me into its stony relief,but the order of the world is lesstaut, a false equation of hieroglyphand brassy machine. Herethe remains of a marbling tulipinfection. All those clawed headsmake a garish heap on the floor.In the clean language of want,a fixed lexicon for love:even the epitaph lies. The silenceis not still. They are mowingand mowing your grave [End Page 14] Double Occupancy My father purchases the burial plots years before she dies. A doubleoccupancy cement bunker, the bottom for my mother. She sits sunk in the reclining chair with her eyes closed, listening or not. Sometimes she slathers Vaseline on her cracked heels and covers them with socks. I move houses and give away the round table, the plants. I move houses again and give away the bed I shared for a time with someone and then with someone else. A month before her funeral, she asks my father to spend the extra money for a plot where they will lie side by side. I sit outside in the cold sun with my sister, the baby crying. "Mom" in the call record makes me think I've missed her again. There are still dishes in the sink when I leave for the airport. Someone in the flat dark is waiting for me to return across the distance. I press my temple to the glass. [End Page 15] Devotional I read words but don't hear God in them. —Susan Howe Friends send words on grieving. Instead, I cometo rely on the mystery of facts—the composition of tears, more mineral than fluid, a different saltarchitecture for relief or prayer. The book of photos magnifies their scale: landscapes repeatin miniature, binding crystal, the substance of stars or stone. On the bus, the crumbling paperwhitesgather in my lap, fallen from the nest of pages, the dusting of petals and pollen—how didn't I notice? Lost in the private room of a sentence. Under the microscope, spires of elationburst in fireworks of glass, while onion tears bloom in the dense symmetry of fern. [End Page 16] The bus rumbles across the city's grid.Through the windows, the stream of red brick material as myth, continuous as a voicemoving over the face of the waters. [End Page 17] Marlo Starr marlo starr is a writer and assistant professor of English at Wittenberg University. Her poems have appeared in The Threepenny Review, Ghost City Review, Napkin Poetry Review, and elsewhere. Copyright © 2023 Marlo Starr

Proposal for a fiber cement panel with the addition of sugarcane bagasse

The objective of the study is to propose a fiber cement panel based on sugarcane bagasse that complies with the basic requirements for non-compressed fiber cement, without using special equipment for its manufacture, reducing the processes by half without compromising the quality of the product. No crusher, kiln, hydraulic press or vacuum pump were used to produce the panels; water was used to clean the fibers and sodium silicate was used as a mineralizing agent; results were compared with NMX standards for structural mortars and fiber cement slabs together with manufacturing processes from previous research on natural fibers to obtain a methodology that optimizes the process. It is demonstrated that it is feasible to produce fiber cement panels that comply with the minimum regulatory requirements by reducing processes, without damaging the physical-mechanical values of the fiber cement. The best performance results show a MOR of 6.70 MPa and a density of 1560 kg⁄m^3 for a panel with 6% cane bagasse added to the dry mass of cement, a water/cement ratio of 0.95 by volume and sand/cement of 2.5 by mass. Opportunities are generated to experiment with counterpart fibers based on the tools, processes and recommendations of the project.

A STUDY ON THE CONTINUOUS USAGE OF ORGANIC,INORGANIC PERSISTENT PESTICIDES IN THE AGRICULTURALFIELDS IN AND AROUND SIRUMALAI AREA WITH A SPECIALREFERENCE TO THE IMPACT ON GROUND WATER AND SOIL

In the present study the impact of pesticide pollution due to the discharge of pesticide waste water from the agricultural field in the Sirumalai agro lands was studied. In order to evaluate the physical and chemical parameters of water, the pond water samples, and the ground water samplesall the sides were collected and analyzed for various water quality parameters and soil parameters. The pond water is the main source of water for the bore wells located in and around the agricultural land. During the rainy season the pond water percolates into wells and bore wells. Now water is completely polluted due to percolation of pesticide waste waters which are potentially harmful, accumulation of various pesticides chemical residues in water reaches the ground water source. Bio – accumulation and bio-concentration of the pesticide waste water causes high degree of pollution. The bore wells in and around the northern side of the pond polluted with very high TDS and it is beyond redemption due to the higher limits of TDS, hardness, phosphate, ammonia and nitrate. All the water samples taken in and around the agriland are notchemically portable. The presence study reveals that the physico-chemical analysis of pond water in the pond as well as ground waters are above the permissible limit. The dissolved oxygen is analyzed and found to be deteriorated. It is due to utilization of dissolved oxygen in the water byorganic matter and by the pesticides. The investigator observed that the solar evaporation tank made of black body tank, function more effectively during summer with very high evaporationrate. The investigator found that during the normal operation period, the colour of the effluent varies and becomes clear after treatment with alum, which favours the penetration of solar energy easily and hence the efficiency of the evaporation tank increases than the normal cement slab. The advantage of utilizing the black body natural kadappa tanks for evaporation is very strong and it can absorb very high degree of solar radiation which is converted into thermal energy. The investigator observed that the solar evaporation tank made of black body tank function more effectively during summer with very high evaporation rate. The solar evaporation tank is blessed in principle of black body surface which can absorb solar radiation more effectively than ordinary cement slab.

The Complexities of Passing

The Complexities of Passing

A traumatic injury leading the lipoma of neck: a rare image.

A 58 years old male visited our hospital with the complaint of swelling over the posterior aspect of the neck after sustaining a trauma as a result of a fall of a cement slab over him 5 years back. The patient is under a combination of metoprolol and telmisartan medication for the rectification of hypertension for 10 years. The patient got admitted to the hospital for the above complaint and has undergone a histopathology report, MRI, and USG investigation. In the histopathology report, we received a single container labelled as a resected specimen of large lipoma. On the cut section, a solid, yellowish, homogenous area was identified. MRI investigation reported a lesion over the nape of the neck size measuring from 25x20x8cm in size. USG report stated a lesion over the nape of the neck and occipital region with the dimensions of the left side as 53x25mm approximately, right side as 58x31.5Â mm approximately. After both MRI and USG investigation, the patient was diagnosed with lipoma over the nape of the neck and occipital region. The patient had gone through two separate operations in a spare of 11 days. Complete excision of Excessive fibrofatty tissue size 10x15 cm lipoma was done. Flap was approximated and romovac drian no 14 placed. Closure was done with ethilon2-0 ac. PPd debridement was done with secondary suturing. Hemostasis was confirmed and Patient stable. Shifted to ward and got discharged after 1 week with prescribed medications and physiotherapy exercise.

Surface Fluorinated Microsized-TiO2 for Formulation of Self-Cleaning Cement

The use of nanosized-Titanium dioxide (n-TiO2) for the formulation of self-cleaning cement has the associated drawbacks of nano-toxicity, higher cost and agglomeration in the cementitious material. These drawbacks can be avoided by the replacement of n-TiO2 with microsized-TiO2 (m-TiO2). However, m-TiO2 is less photocatalytically active as compared to n-TiO2 . Therefore, in the present work, surface fluorination of m-TiO2 has been studied to enhance its photocatlytic activity for the formulation of self-cleaning white cement. The commercially available m-TiO2 (average size 40 μm) was surface fluorinated using aqueous solutions of different molar concentrations of NaF (sodium fluoride) such as 10, 50, and 100 mmol dm-3. The surface fluorinated m-TiO2 was analyzed using diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL) and X-ray diffraction (XRD) analysis to observe the improvement in the physiochemical properties and photocatalytic characteristics. Further, the surface fluorinated m-TiO2 along with calcined dolomite was utilized for the formulation of self-cleaning white cement. The hence prepared self-cleaning cement was cast into cement slabs, which were then characterized by diffuse reflectance spectroscopy (DRS) and energy dispersive spectroscopy (EDS). The self-cleaning ability and photocatalytic activity of the as prepared cement slabs were evaluated through Rhodamine B (RhB) degradation test. It has been found that the use m-TiO2, which was surface fluorinated using 10 mmol dm-3 solution of NaF, remarkably enhanced the photocatalytic performance of the self-cleaning cement.

Effect of fiber content on bending performance of glass fiber reinforced cement slab

To investigate the effect of fiber content on the bending properties of oriented glass fiber reinforced cement (GRC), the four-point flexural test was used to get the fracture performance of oriented GRC slab, and a 3D numerical model is created by RFPA^3D simulation software.The failure modes of the GRC slab with different glass fiber content are compared.The load-displacement curve of the specimen is analyzed, and the strengthening and toughening effect of the fiber is investigated by fracture energy. The results show that the peak load of the specimens enhances with the increase of the oriented fiber within volume fraction of 0.5% and 2.0%. The specimen with added fibers still has a certain bearing capacity when cracks appear at the bottom, and the fibers are damaged but not broken. With the increase of fiber content, the crack propagation path becomes more tortuous, the more work is done when failure occurs, and the better the toughness is. The study can provide a reference for reinforcement of directional GRC.

Production of cement slabs using sugarcane bagasse ash associated with expanded polystyrene

Civil construction is considered a major generator of urban solid waste and one way to mitigate this problem is to invest in modular construction systems, making room for lean and sustainable models. This paper evaluated the potential of Sugarcane Bagasse Ash (SCBA) as composites, combined with the inclusion of expanded polystyrene (EPS) in the production of cement slabs applied to civil construction. For the partial substitution of Portland Cement (PC) the chemical characterization of SCBA by fluorescence and X-ray diffraction was carried out and its production used concentrations from 6.8% to 25.5% of SCBA. In the cementitious plate, tensile strength tests were performed for flexure tensile strength, water absorption and permeability, in accordance to Brazilian guidelines. The results demonstrated the use of SCBA in partial substitution of PC in the proportion of 6.8% and 13.6% with absence of fine sand and 17% with addition of fine sand, allowing its use in a clean, modular and dry construction technology. It is possible to conclude, therefore, that the industrial residue of SCBA can be used in substitution of PC and that the inclusion of EPS in the studied product’s formula increases its volume and decreases its apparent density.

Evaluation of Practical and Modern Composting Techniques in Kuwait

Kuwait imports more than 2 million sheep per year to feed its population. Moreover, Kuwait City produces 3.5 million kg of compostable municipal waste each day. Lastly, Desert Storm and Desert Shield has produced 120 oil lakes that need remediation. These three major environmental factors could be resolved by a simple solution, composting. This preliminary study focused on composting carcasses from the imported sheep and associated losses due to transportation. The unique climate conditions in Kuwait presented different challenges to composting. This study is the first step in addressing these environmental concerns. This research was divided into 2 sections: 1) classic cement slab composting of dead sheep with microbiology assessment, and 2) Tri-Form Poly Ecodrum® composting of sheep with microbiology assessment. The classic method using the cement slab was modified by eliminating the turning step used to keep the process aerobic. Instead, air was introduced directly into the piles of compost. This modification did not shorten the time needed for composting but reduced the manual labor needed for the turning of piles. The Ecodrum® accelerated the composting process by at least five-fold; the four months processing by the traditional cement slab method was reduced to only 20 to 25 days using the Ecodrum®. This is the first report that investigates and details the comparison between classical and modern composting techniques to show their equivalency. The color and texture of the Ecodrum® and the cement slab products were similar. This report details the bacterial and fungal tests for the different compost products..

Corrosion and puncture resistance of aluminium foil gas membranes beneath concrete slabs

Aluminium foil (AF) membranes are commonly installed below or above concrete floor slabs to reduce the migration of ground gases into buildings. The membranes typically comprise laminates of low-density polyethylene (LDPE), reinforcement and an aluminium foil layer. The key component providing gas resistance is the aluminium layer. This is typically 0.012 mm thick and is often encapsulated by very thin layers of LDPE. The foil is therefore vulnerable to damage from puncture by narrow sharp objects in the field. Aluminium corrodes in aggressive and moist environments and could therefore be affected by the fresh cement slabs and/or ground moisture. This paper summarises testing completed to assess the puncture and penetration vulnerability of AF membranes in real life scenarios and the observations from an experiment where AF membranes were exposed to various conditions, including alkaline, acidic and direct contact with cement environments. Based on the results, design considerations are provided for AF membrane applications.

Evaluation method of technical condition façade systems

The technique of monitoring the conditions of a fçgade system as part of the scientific and technical support of construction. The building demands an increased level of responsibility. Facade systems “ZIAS-100.02” with cladding with fiber cement slabs and “ZIAS-100.02” with cladding with concrete slabs are used during the construction. Monitoring of the system is carried out in order to verify the compliance of the facade fencing with the requirements of design documentation, applicable standards and requirements, as well as to determine and evaluate the actual condition of the facade system. Selective tests of anchor dowels of sizes 10x135 and 10x100 mm used in hinged facade systems were completed as part of the monitoring. The tests were carried out after a visual inspection of the facade system structures. During the tests, the ONIKS-1.VD.050 material strength meter was used. Anchor dowels were pulled out from two types of walls. The first type of walls is made of foam concrete blocks, the second type of monolithic reinforced concrete. The results of tests for two types of walls are presented. A variant of processing the individual results of the breaking load values obtained during the testing of anchor dowels of the facade system is also shown.

Vibro-acoustic modulation and data fusion for localizing alkali–silica reaction–induced damage in concrete

This article investigates the application of vibro-acoustic modulation testing for diagnosing damage in concrete structures. The vibro-acoustic modulation technique employs two excitation frequencies on a structure. The interaction of these excitations in the measured response indicates damage through the presence of sidebands in the frequency spectra. Past studies using this technique have mostly focused on metals and composites (thin plates or laminates). Our research focuses on concrete, which is a highly heterogeneous material susceptible to a variety of chemical, physical, and mechanical damage processes. In particular, this article investigates diagnosing cracking in concrete from an expansive gel produced by an alkali–silica reaction in the presence of moisture. Past studies have been limited to damage detection using vibro-acoustic modulation testing, whereas this article extends the technique to damage localization. A cement slab with pockets of reactive aggregate is used to investigate the diagnosis technique. The effects of different testing parameters, such as locations, magnitudes, and frequencies of the two excitations, are analyzed and incorporated in the damage localization methodology. A Bayesian probabilistic methodology is developed to fuse the information from multiple test configurations in order to construct damage probability maps for the test specimen. The results of vibro-acoustic modulation–based damage localization are validated by petrographic study of cores taken from the slab.