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The purpose of this investigation was to determine the bulk specific gravity of, and the percentage of seawater absorbed by, three precast lightweight concretes as a consequence of extended submersion in 66F seawater at simulated oceanic depths of 1 ft, 40 ft, and 350 ft (respectively, nearly 0 psi, 18 psi, and 155 psi hydrostatic).

Format: Book Author/Creator: Perlite Products (Delaware County, Pa.) Contributor: Trade Catalogue Collection (Athenaeum of Philadelphia) Language: English Subjects (All): Perlite Products (Delaware County, Pa.)--Catalogs. Perlite--Catalogs. Insulating materials--Catalogs. Concrete construction--Equipment and supplies--Catalogs. Plaster--Catalogs. Genre: Trade catalogs -- Perlite. Physical Description:[4] p. : ill. ; 28 cm.Place of Publication:Delaware County, Pa. : Perlite Products, [195-?]Notes:"AIA 21A5."Local Notes:Athenaeum copy: Gift of: Benjamin S. Linfoot.OCLC:852997125

Vibration Laser Screed Lightweight, Portable, And Precision Driven Concrete Leveling

Joint Highway Research Project: FHWA/IN/JHRP-60/14; Project C-36-56G, File No. 7-4-7

Joint Highway Research Project: FHWA/IN/JHRP-60/14; Project C-36-56G, File No. 7-4-7

Joint Highway Research Project: FHWA/IN/JHRP-60/14; Project C-36-56G, File No. 7-4-7

The International Journal of Cement Composites and Lightweight Concrete 1989: Volume 11 , Issue Index. Digitized from IA1652928-02 . Next issue: sim_cement-concrete-composites_1989-02_11_1 .

The International Journal of Cement Composites and Lightweight Concrete 1981: Volume 3 , Issue Index. Digitized from IA1643916-04 . Next issue: sim_cement-concrete-composites_the-international-journa_1981-02_3_1 .

This article is from International Journal of Molecular Sciences , volume 13 . Abstract In this paper, we report the results of our investigation on the possibility of producing foam concrete by using a geopolymer system. Class C fly ash was mixed with an alkaline activator solution (a mixture of sodium silicate and NaOH), and foam was added to the geopolymeric mixture to produce lightweight concrete. The NaOH solution was prepared by dilute NaOH pellets with distilled water. The reactives were mixed to produce a homogeneous mixture, which was placed into a 50 mm mold and cured at two different curing temperatures (60 °C and room temperature), for 24 hours. After the curing process, the strengths of the samples were tested on days 1, 7, and 28. The water absorption, porosity, chemical composition, microstructure, XRD and FTIR analyses were studied. The results showed that the sample which was cured at 60 °C (LW2) produced the maximum compressive strength for all tests, (11.03 MPa, 17.59 MPa, and 18.19 MPa) for days 1, 7, and 28, respectively. Also, the water absorption and porosity of LW2 were reduced by 6.78% and 1.22% after 28 days, respectively. The SEM showed that the LW2 sample had a denser matrix than LW1. This was because LW2 was heat cured, which caused the geopolymerization rate to increase, producing a denser matrix. However for LW1, microcracks were present on the surface, which reduced the compressive strength and increased water absorption and porosity.

This article is from International Journal of Molecular Sciences , volume 13 . Abstract In this paper, we report the results of our investigation on the possibility of producing foam concrete by using a geopolymer system. Class C fly ash was mixed with an alkaline activator solution (a mixture of sodium silicate and NaOH), and foam was added to the geopolymeric mixture to produce lightweight concrete. The NaOH solution was prepared by dilute NaOH pellets with distilled water. The reactives were mixed to produce a homogeneous mixture, which was placed into a 50 mm mold and cured at two different curing temperatures (60 °C and room temperature), for 24 hours. After the curing process, the strengths of the samples were tested on days 1, 7, and 28. The water absorption, porosity, chemical composition, microstructure, XRD and FTIR analyses were studied. The results showed that the sample which was cured at 60 °C (LW2) produced the maximum compressive strength for all tests, (11.03 MPa, 17.59 MPa, and 18.19 MPa) for days 1, 7, and 28, respectively. Also, the water absorption and porosity of LW2 were reduced by 6.78% and 1.22% after 28 days, respectively. The SEM showed that the LW2 sample had a denser matrix than LW1. This was because LW2 was heat cured, which caused the geopolymerization rate to increase, producing a denser matrix. However for LW1, microcracks were present on the surface, which reduced the compressive strength and increased water absorption and porosity.

This paper presents a study of the thermal properties of polystyrene lightweight concretes used as thermal insulation in buildings. Concrete mixtures, prepared using an identical matrix and differing dosage of polystyrene by replacing a portion of the volume of cement paste with polystyrene beads.

Perma.cc archive of https://www.dezeen.com/2018/08/03/eth-zurich-makes-light-concrete-ceiling-using-3d-sand-printing/ created on 2022-03-07 16:06:15.050977+00:00.

Vibration Laser Screed Ultra Lightweight Precision For Flawless Concrete Leveling

Cyclic loading and weathering of reinforced concrete bridge decks cause corrosion of reinforcement steel, which leads to cracking, potholes, and other problems. This project demonstrated the use of a glass-fiber reinforced polymer (GFRP) composite deck system, which does not use any reinforcement steel, on a deteriorated concrete bridge at Redstone Arsenal, AL. A pultruded deck system made by Zellcomp, Inc., was selected for demonstration and validation. The demonstrated system was designed to retain the 36-ton (HS-20) load rating of the original bridge. This report documents demolition of the existing deck, installation of the composite deck system, materials and load testing, remediation of initial problems, and an economic analysis in terms of return on investment (ROI).The main problems identified after construction were reflective cracking of the polymer-concrete wear surface applied over the composite deck sections; and gaps and voids related to grout forms and supports installed between bridge girders and deck sections. After repairs, the bridge was returned to service and is functioning normally. The calculated ROI for this technology was5.4. Although there are not yet consensus standards for composite bridge decks, the demonstrated technology can be effectively applied using existing load-resistance design factors and manufacturer installation instructions.

Cyclic loading and weathering of reinforced concrete bridge decks cause corrosion of reinforcement steel, which leads to cracking, potholes, and other problems. This project demonstrated the use of a glass-fiber reinforced polymer (GFRP) composite deck system, which does not use any reinforcement steel, on a deteriorated concrete bridge at Redstone Arsenal, AL. A pultruded deck system made by Zellcomp, Inc., was selected for demonstration and validation. The demonstrated system was designed to retain the 36-ton (HS-20) load rating of the original bridge. This report documents demolition of the existing deck, installation of the composite deck system, materials and load testing, remediation of initial problems, and an economic analysis in terms of return on investment (ROI).The main problems identified after construction were reflective cracking of the polymer-concrete wear surface applied over the composite deck sections; and gaps and voids related to grout forms and supports installed between bridge girders and deck sections. After repairs, the bridge was returned to service and is functioning normally. The calculated ROI for this technology was5.4. Although there are not yet consensus standards for composite bridge decks, the demonstrated technology can be effectively applied using existing load-resistance design factors and manufacturer installation instructions.

The International Journal of Cement Composites and Lightweight Concrete 1983: Volume 5 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1982-11_4_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1983-02_5_1 .

The International Journal of Cement Composites and Lightweight Concrete 1988: Volume 10 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1987-11_9_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1988-02_10_1 .

24 p. : 28 cm

Polymer absorption by lightweight concretes to improve bonding between cement and aggregate and to increase strength of cement is discussed. Compressive strength of treated cement is compared with strength of untreated product. Process for producing polymers is described.

The International Journal of Cement Composites and Lightweight Concrete 1986: Volume 8 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1985-11_7_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1986-02_8_1 .

Lightweight concrete has significant importance due to its special features including weight reduction of structures.This article aims to study ‎the effect of silica fume (SF) and ‎nano silica (Na) on mechanical properties of fiber reinforced concrete containing lightweight scoria aggregates. SF ‎and Na are replaced by different amounts of cement weight. The used amounts of Steel and ‎polypropylene fibers having different length to ‎diameter ratios are different.‎ For this study, seventeen different lightweight mixtures ‎were made and tested for mechanical strengths, water absorption and density. ‎Results show that optimized replacement ‎amount of SF and Na is 10% and 3%, respectively. Steel fiber in comparison to ‎Polypropylene fiber had‎ better effect on mechanical characteristics of lightweight concrete.‎

The International Journal of Cement Composites and Lightweight Concrete 1984: Volume 6 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1983-11_5_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1984-02_6_1 .

[4] p., ill., 28 cm, trade catalog

[4] p., ill., 28 cm, trade catalog

The dynamic energy-absorption characteristics of confined lightweight vermiculite concrete are presented in the form of stress-strain and stress-time curves. In addition, data are included which show the effects of impact velocity and impact mass weight on these characteristics. Stress-strain and energy-absorption characteristics are discussed. A comparison is made between a dynamic and a static stress-strain curve for this material. For a cement to vermiculite mix of 1 to 8, the initial peak crushing stress is between 420 and 570 psi, and the average crushing stress to 30% strain is between 350 and 450 psi. The energy dissipated to 30% strain is between 8.8 and 10.9 ft-lb/cu in.

Document number CIA-RDP86-00244R000300020053-4 declassified and released through the CIA's CREST database. Previously available only on four computers located outside of Washington D.C., the Agency was successfully pressured into putting the files online as a result of a MuckRock lawsuit and the efforts of Emma Best. The metadata was collected by Data.World, and the files are now being archived and made text searchable by the Internet Archive.

Document number CIA-RDP86-00244R000300020053-4 declassified and released through the CIA's CREST database. Previously available only on four computers located outside of Washington D.C., the Agency was successfully pressured into putting the files online as a result of a MuckRock lawsuit and the efforts of Emma Best. The metadata was collected by Data.World, and the files are now being archived and made text searchable by the Internet Archive.

The objective of this investigation was to determine the causes of the undulation problem (waffle pattern) that developed in the lightweight concrete floor slabs at the East Los Angeles Comprehensive Health Center and to determine the effect, if any, on the serviceability and the safety of the structure. Samples of portland cement and lightweight aggregate were examined using petrographic methods. Concrete cores obtained from the structure were tested for air content and unit weight. Simplified model tests and study of early concrete volume changes were carried out in the laboratory to simulate the construction conditions. In addition, two-dimensional thermal calculation for predicting concrete temperatures during construction was performed. Based on the results of these laboratory examinations and inspection of the construction photographs, it can be concluded that the undulations were not caused by a materials problem and should not have structural implications. It is believed that the waffle pattern was developed due to the movement of the upper reinforcing steel bars while the concrete was still unhardened. The waffle effect seen on the hardened lightweight concrete floor surfaces was largely residual due to incomplete removal during finishing operations. If indeed there was any movement after finishing of these surfaces, it was probably due to a combination of factors such as expansion due to aluminum contamination of aggregates, form settlement, and perhaps, other factors that could not be positively identified. (Author)

The objective of this investigation was to determine the causes of the undulation problem (waffle pattern) that developed in the lightweight concrete floor slabs at the East Los Angeles Comprehensive Health Center and to determine the effect, if any, on the serviceability and the safety of the structure. Samples of portland cement and lightweight aggregate were examined using petrographic methods. Concrete cores obtained from the structure were tested for air content and unit weight. Simplified model tests and study of early concrete volume changes were carried out in the laboratory to simulate the construction conditions. In addition, two-dimensional thermal calculation for predicting concrete temperatures during construction was performed. Based on the results of these laboratory examinations and inspection of the construction photographs, it can be concluded that the undulations were not caused by a materials problem and should not have structural implications. It is believed that the waffle pattern was developed due to the movement of the upper reinforcing steel bars while the concrete was still unhardened. The waffle effect seen on the hardened lightweight concrete floor surfaces was largely residual due to incomplete removal during finishing operations. If indeed there was any movement after finishing of these surfaces, it was probably due to a combination of factors such as expansion due to aluminum contamination of aggregates, form settlement, and perhaps, other factors that could not be positively identified. (Author)

The objective of this investigation was to determine the causes of the undulation problem (waffle pattern) that developed in the lightweight concrete floor slabs at the East Los Angeles Comprehensive Health Center and to determine the effect, if any, on the serviceability and the safety of the structure. Samples of portland cement and lightweight aggregate were examined using petrographic methods. Concrete cores obtained from the structure were tested for air content and unit weight. Simplified model tests and study of early concrete volume changes were carried out in the laboratory to simulate the construction conditions. In addition, two-dimensional thermal calculation for predicting concrete temperatures during construction was performed. Based on the results of these laboratory examinations and inspection of the construction photographs, it can be concluded that the undulations were not caused by a materials problem and should not have structural implications. It is believed that the waffle pattern was developed due to the movement of the upper reinforcing steel bars while the concrete was still unhardened. The waffle effect seen on the hardened lightweight concrete floor surfaces was largely residual due to incomplete removal during finishing operations. If indeed there was any movement after finishing of these surfaces, it was probably due to a combination of factors such as expansion due to aluminum contamination of aggregates, form settlement, and perhaps, other factors that could not be positively identified. (Author)

4 p., ill., 28 cm., trade catalog

4 p., ill., 28 cm., trade catalog

4 p., ill., 28 cm., trade catalog

As perlite suppliers we manufacture a full range of Perlite filter media. Perlite has been described as the versatile mineral, read more here.

This report is the initial effort in the development of LWPC as a suitable shipbuilding material and the identification of applications which are most suitable to the material. Therefore, the historical use and the current state-of-the-art of the material for ship construction is identified. The properties of the material and criteria for the design of LWPC ships are presented as well as considerations regarding the maintainability and repairability of LWPC hulls. In order to focus on suitable applications, LWPC hull concepts have been developed in order to compare costs and capabilities with existing Navy ships. (Author)

This report is the initial effort in the development of LWPC as a suitable shipbuilding material and the identification of applications which are most suitable to the material. Therefore, the historical use and the current state-of-the-art of the material for ship construction is identified. The properties of the material and criteria for the design of LWPC ships are presented as well as considerations regarding the maintainability and repairability of LWPC hulls. In order to focus on suitable applications, LWPC hull concepts have been developed in order to compare costs and capabilities with existing Navy ships. (Author)

This report presents the findings of a study that developed and tested high- strength lightweight concrete (HSLC) mixes having strengths from 8,000 psi to 12,000 psi made using slate lightweight aggregate. Based on optimized mix designs, 6 pretensioned AASHTO Type II girders were constructed using 8,000 psi and 10,000 psi slate HSLC and were prestressed using 0.6-inch diameter LOLAX strands tensioned to 75% of strand ultimate stress. The strands received no special preparation prior to girder casting. After initial curing for approximately 24 hours, transfer length measurements were taken from time of release until the beams reached an age of 14 days. The current AASHTO and ACI code provisions conservatively predicted transfer length for slate HSLC; modification of the current code specifications for transfer length was not necessary for slate HSLC. A direct pullout test was performed on both concrete design strengths to determine the bond between the slate lightweight concrete and the prestressing strand. A somewhat lower bond stress developed between the prestressing strand and the lightweight concrete when compared to similar strengths of normal-weight concrete. However, the average pullout strength for both series exceeded the minimum required value for 0.6-inch diameter strand of 43.2 kips. Tests were conducted on each girder end to determine development length characteristics.

The International Journal of Cement Composites and Lightweight Concrete 1985: Volume 7 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1984-11_6_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1985-02_7_1 .

Joint Transportation Research Program: FHWA/IN/JTRP-98/17; Project C-36-56MM, File No. 7-4-39

Joint Transportation Research Program: FHWA/IN/JTRP-98/17-2; Project C-36-56MM, File No. 7-4-39

The main objective of this project is to use the waste plastic as a coarse aggregate for making concrete. It is due to rapid industrialization and urbanization and increase on the plastic waste. The purpose of this investigation is to examine the custom of waste plastic as coarse aggregate in concrete mix of M20 grade concrete in a fractional way. In this investigation, the three mixes are prepared by using waste plastic. The waste plastic can be replaced in place of coarse aggregate in terms of volume 10 , 20 , and 30 and the suitable ratio can be obtained which meets the desire strength and cost effectiveness. The waste plastic is still not used in many areas where it can be used. It‘s observed that up to 10 replacement of ordinary coarse aggregate replaced by plastic coarse aggregate the compressive strength of concrete will increases after 10 it start decreasing. It is eco friendly building material it does not harm environment. And it is was observed that an increase in percentage of plastic waste will decrease the density of concrete. It satisfies the SDG goal of RESPONSIBLE CONSUMPSTION, PRODUCTION good involving use the product which affect the environment. Nisha. N | K. Vaidhegi | Jawahar "Investigation on Waste Plastic Sustainable Cellular Lightweight Concrete" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-1 , December 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47849.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/47849/investigation-on-waste-plastic-sustainable-cellular-lightweight-concrete/nisha-n

The International Journal of Cement Composites and Lightweight Concrete 1987: Volume 9 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1986-11_8_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1987-02_9_1 .

The International Journal of Cement Composites and Lightweight Concrete 1982: Volume 4 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1981-11_3_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1982-02_4_1 .

The International Journal of Cement Composites and Lightweight Concrete 1982: Volume 4 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1981-11_3_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1982-02_4_1 .

The International Journal of Cement Composites and Lightweight Concrete 1982: Volume 4 , Issue Index. Digitized from IA1643916-04 . Previous issue: sim_cement-concrete-composites_the-international-journa_1981-11_3_4 . Next issue: sim_cement-concrete-composites_the-international-journa_1982-02_4_1 .

In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. (For more information: 12 Tables of Code ) Name of Standards Organization: Bureau of Indian Standards (BIS) Committee Designation: CED 53 Designator of Legally Binding Document: IS 17908 : 2023 Title of Legally Binding Document: Fibre Cement Sheet-Lightweight Concrete Sandwich Panels-Specification Number of Amendments: 0 Status: Active Additional Info: LEGALLY BINDING DOCUMENT Step Out From the Old to the New --Jawaharlal Nehru

Masonry construction continues to predominate in U.S. military construction and other sectors, but there has been little improvement in masonry structural technology for several decades. Without improvements in materials and productivity, the cost of masonry construction will significantly increase. To help keep masonry construction affordable, the U.S. Army Construction Engineering Research Laboratories (USACERL) initiated a Cooperative Research and Development Agreement with the University of Nebraska Center for Infrastructure Research to develop a lightweight high-strength concrete masonry unit (CMU). The objective of this research was to merge high-strength concrete and lightweight concrete technologies to produce a high-performance lightweight CMU up to 50 percent lighter than normal-weight units while maintaining or improving structural characteristics. The work produced a new type of high-strength lightweight CMU that can be manufactured using industry-standard equipment and meets or exceeds all performance-based requirements for block masonry. Using expanded shale aggregates and an optimized unit shape as the primary innovative components, the high-performance lightweight CMUs weigh about 8.6 kg and have average net compressive strength of 4000 lb/in.2 The minimum void gradation of the expanded shale was modified to provide high strength, good durability, and a smooth, uniform texture. Details on mix design and optimized block shape are provided.

Joint Highway Research Project: FHWA/IN/JHRP-60/20; Project C-36-56G, File No. 7-4-7

No Description

Joint Transportation Research Program: FHWA/IN/JTRP-99/03; Project C-36-56RR, File No. 7-4-43