scholarly journals Structural Behavior of Precast Lightweight Foam Concrete Sandwich Panel with Double Shear Truss Connectors under Flexural Load

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Noridah Mohamad ◽  
A. I. Khalil ◽  
A. A. Abdul Samad ◽  
W. I. Goh
Keyword(s):  
Compressive Strength ◽  
Sandwich Panel ◽  
Crack Pattern ◽  
Structural Behavior ◽  
Foam Concrete ◽  
Structural Behaviour ◽  
Shear Connectors ◽  
Double Shear ◽  
Partially Composite ◽  
Lightweight Foam

This paper presents the structural behaviour of precast lightweight foam concrete sandwich panel (PFLP) under flexure, studied experimentally and theoretically. Four (4) full scale specimens with a double shear steel connector of 6 mm diameter and steel reinforcement of 9 mm diameter were cast and tested. The panel’s structural behavior was studied in the context of its ultimate flexure load, crack pattern, load-deflection profile, and efficiency of shear connectors. Results showed that the ultimate flexure load obtained from the experiment is influenced by the panel’s compressive strength and thickness. The crack pattern recorded in each panel showed the emergence of initial cracks at the midspan which later spread toward the left and right zones of the slab. The theoretical ultimate load for fully composite and noncomposite panels was obtained from the classical equations. All panel specimens were found to behave in a partially composite manner. Panels PLFP-3 and PLFP-4 with higher compressive strength and total thickness managed to obtain a higher degree of compositeness which is 30 and 32.6 percent, respectively.

The Structural Performance of Precast Lightweight Foam Concrete Sandwich Panel with Single and Double Shear Truss Connectors Subjected to Axial Load

2013 ◽  
Vol 634-638 ◽  
pp. 2746-2751 ◽  
Author(s):  
Noridah Mohamad ◽  
Najmuddin Hassan
Keyword(s):  
Construction Industry ◽  
Axial Load ◽  
Sandwich Panel ◽  
Structural Performance ◽  
Foam Concrete ◽  
Shear Connectors ◽  
Double Shear ◽  
Steel Bar ◽  
Strength Capacity ◽  
Lightweight Foam

The progressive research upon the issue on renewal technology that can improve the construction industry has initiated the study of Precast Lightweight Foam Concrete Sandwich Panel (PLFP) as an alternative to Industrialize Building System (IBS). This paper reports the analysis of structural behavior of PLFP with double shear connectors under axial load. The PLFP panel consists of two wythes which enclosed a layer of polystyrene layer. Six (6 mm) rebar was used as the vertical and horizontal reinforcement and 9 mm steel bar bent at 450 was used as the connector. Full scaled panel was tested under axial load till failure. It was found that PLFP panel with double shear truss connector has higher ultimate strength capacity compared to PLFP with single shear connectors ehen tested under axial load.

scholarly journals Fire resistance of lightweight foam concrete by incorporating lightweight bio-based aggregate

2021 ◽  
Vol 920 (1) ◽  
pp. 012009
Author(s):  
M K Yew ◽  
M C Yew ◽  
J H Beh ◽  
L H Saw ◽  
Y L Lee ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fire Resistance ◽  
Coarse Aggregate ◽  
Positive Outcome ◽  
Strength Properties ◽  
Sound Insulation ◽  
Foam Concrete ◽  
Load Bearing ◽  
Oil Palm Shell ◽  
Lightweight Foam

Abstract Concrete is widely used in the industry due to its effectiveness in terms of cost and strength. In this study, the introduction of bio-based aggregate as coarse aggregate in lightweight foam concrete will be investigated to find a better solution for fire incidents that are commonly happened. As such, lightweight foam concrete (LWFC) has been applied in many buildings especially in non-load bearing wall to enhance thermal conductivity, sound insulation and fire resistance. The aim of this research is to investigate the effect of incorporating bio-based aggregate namely oil palm shell (OPS) into lightweight form concrete in terms of strength properties and fire resistance. Three different concrete mix was designed containing different percentage of OPS aggregate replacement (0, 5, 10 and 15%). From the result, the compressive strength of the LWFC-CTR mixture had achieved the highest compressive strength at 28-day, which is recorded at 3.82 MPa. The fire resistance of LWFC-OPS 15% had showed a positive outcome with improvement by almost 23.5% compared to control mix at 15 minutes. Therefore, the major finding of this research is the incorporation of eco-friendly OPS aggregate has improved the fire resistance of lightweight foam concrete, which can be used as an alternative solution for non-load bearing walls.

PENGARUH PEMANFAATAN ABU SEKAM PADI PADA BATA BETON RINGAN FOAM TERHADAP KUAT TEKAN, BERAT JENIS, DAN DAYA SERAP AIR SEBAGAI SUPLEMEN BAHAN AJAR MATA KULIAH TEKNOLOGI BETON (PADA MAHASISWA SEMESTER III PTB FKIP UNS)

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
Ari Sri Wahyuni ◽  
Chundakus Habsya ◽  
Ernawati Sri Sunarsih
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Lightweight Concrete ◽  
Foam Concrete ◽  
Concrete Technology ◽  
Course Materials ◽  
Dependent Variables ◽  
Course Material ◽  
Lightweight Foam

<p>The purposes of this research were to, (1) determine the influence of rice husk ash as smooth aggregate partial substitute and foam variation towards compressive strength, density, and absorption of lightweight foam concrete brick, (2) determine the percentage of rice husk ash as smooth aggregate partial substitute and foam variation to achieve the compressive strength which fulfilled SNI No. 03 – 0349 – 1989, (3) determine the percentage of rice husk ash as smooth aggregate partial substitute and foam variation to achieve the density lightweight concrete which fulfilled SNI No. 03 – 0349 – 1989, (4) determine the percentage of rice husk ash as smooth aggregate partial substitute and foam variation to achieve the absorption which fulfilled SNI No. 03 – 0349 – 1989, (5) produce course material supplement of concrete technology on the influence of using rice husk ash in lightweight foam concrete brick toward compressive strength, density, and absorption. <br />This research used experimental method and data analysis techniques used regression analysis. Variables in the study were (1) dependent variables: compressive strength, density, and absorption of lightweight foam concrete bricks, (2) independent variables: the substitute of smooth aggregate to rice husk ash with variation 0%, 25%, 35%, and 45% and foam variation 0,2 and 0,3 of concrete volume.<br />Based on the results of the study concluded that, (1) variation of rice husk ash and foam was strongly influence towards the compressive strength, density, and absorption of lightweight foam concrete bricks, (2) There was no percentage of rice husk ash and foam to achieve the compressive strength of lightweight foam concrete brick which fulfilled SNI No. 03 – 0349 – 1989, (3) All percentages of rice husk ash and foam variation produced the density value of lightweight foam concrete brick which fulfilled SNI No. 03 – 0349 – 1989, (4) All percentages of rice husk ash and foam variation produced the absorption value of lightweight foam concrete brick which fulfilled SNI No. 03 – 0349 – 1989, (5) the output course materials was a course materials supplement about the influence of the use rice husk ash as partly smooth agregate substitute of lightweight foam concrete brick to compressive strength, density, and absorption.</p><p>Keywords: rice husk ash, foam, lightweight foam concrete bricks.</p><span><span><br /></span></span>

scholarly journals EFFECT OF FOAMING AGENT IN SELF CONSOLIDATING LIGHTWEIGHT CONCRETE (SCLC)

2019 ◽  
Vol 81 (4) ◽  
Author(s):  
Mohd Afiq Mohd Fauzi ◽  
Ahmad Ruslan Mohd Ridzuan ◽  
Nurliza Jasmi ◽  
Mohd Fadzil Arshad ◽  
Mohd Shafee Harun
Keyword(s):  
Compressive Strength ◽  
Lightweight Concrete ◽  
Foam Concrete ◽  
Concrete Technology ◽  
Normal Concrete ◽  
Conventional Concrete ◽  
Foaming Agent ◽  
Self Consolidating Concrete ◽  
Strength Performance ◽  
Lightweight Foam

Self-Consolidating Lightweight Concrete (SCLC) is relatively a new concept and can be regarded as a revolutionary development in the field of concrete technology. It is a type of concrete that might not require vibration for placing it and could be produced by reducing the density of concrete. However, the density of normal Self Consolidating Concrete (SCC) is similar to normal concrete approximately 2400kg/m3. By using foaming agent, the density of concrete can be reduced up to 1800kg/m3. Due to the heavy density of concrete, it will give the initial higher supply cost over conventional concrete, has slowed down its application to general construction. It is also hard to handle for construction and transportation. Therefore, it is advantages to produce SCC with lower density to provide benefit and enhancement of its performance by a combination of two types of concrete technology that is SCC technology and Lightweight Foam Concrete technology. This paper was focused to identify the effect of foaming agent on the fresh properties and compressive strength of SCLC. The influence of foaming agent contained in the range from 0 second, 1 second, 2 second, 3 second and 4 second to the strength characteristic identified in the SCLC. The specimens were tested for compressive strength at 3, 7, 14 and 28 days. The result indicated that the compressive strength of SCLC is decreasing when foaming agent content was added. Meanwhile, the flowability of SCLC is increasing when foaming agent content added. Based on the finding, SCLC containing 3 second of foaming agent is achieving the density target, which is 1800kg/m3 and better compressive strength performance.

Rational Proportion For Mixture Of Foamed Concrete Design

2011 ◽  
Author(s):  
Fahrizal Zulkarnain ◽  
Mahyuddin Ramli
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Silica Fume ◽  
Mineral Admixture ◽  
Concrete Mixture ◽  
Foam Concrete ◽  
Foamed Concrete ◽  
Mixed Mortar ◽  
And Control ◽  
Lightweight Foam

Kajian ini membentangkan sebahagian hasil kerja makmal untuk reka bentuk konkrit ringan berbusa dengan Protein Agent 1 sebagai busa, silica fume (SF) sebagai bahan tambah dan superplasticizer (SP). Konkrit ringan berbusa terkawal dicampurkan dengan kandungan simen Portland biasa (OPC) dan silica fume, campuran tersebut pada kadar 10 peratus, dari berat simen sebagai bahan tambah akan disediakan. Silica fume digunakan untuk meningkatkan kekuatan mampat dan juga menjimatkan kos. Konkrit berbusa diawetkan pada kisaran 70 peratus kelembapan dan 28 darjah kandungan udara. Sifat mekanikal daripada struktur konkrit ringan berbusa juga didedahkan. Dapatan kajian menunjukkan bahawa serapan air dalam kajian besar adanya. Walaupun demikian, silica fume perlu digunakan untuk menghasilkan struktur ringan berbusa yang murah dan mesra alam, dengan kekuatan mampat dan kawalan struktur ringan berbusa menggunakan simen Portland biasa (OPC) sahaja. Kata kunci: Campuran konkrit berbusa; ketumpatan mortar; ketumpatan sebenar; sifat mekanikal; kekuatan mampat This paper presents part of the results of laboratory work to design a lightweight foamed concrete made with Protein Agent 1 as foam, silica fume (SF) mineral admixture and superplasticizer (SP). Control of foamed concrete mixture made with foam containing only Ordinary Portland Cement (OPC) and SF, lightweight foam concrete mixture containing 10% of SF as a replacement for the cement in weight basis was prepared. SF is used to increase the compressive strength and for economical concerns. The foam concrete was cured at 70% relative humidity and ± 28°C temperature. The mechanical properties of a lightweight foam concrete with OPC are presented. The findings indicate that water absorption of aggregate is large in this case. However, the use of SF seems to be necessary for the production of cheaper and environmentfriendly structural foamed concrete with compressive strength and control structural foamed concrete containing only OPC. Key words: Foam concrete mixed; mortar density; actual density; mechanical properties; compressive strength

Structural Behaviour of Precast Lightweight Foamed Concrete Sandwich Panel (PLFP) with Double Shear Truss Connectors under Eccentric Load: Preliminary Result

2013 ◽  
Vol 795 ◽  
pp. 414-418
Author(s):  
I. Ahmad ◽  
W.I. Goh ◽  
S. Samsuddin ◽  
N. Mohamad ◽  
M.H.A. Rahman ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Sandwich Panel ◽  
Ultimate Load ◽  
Load Carrying Capacity ◽  
Structural Behaviour ◽  
Eccentric Load ◽  
Double Shear ◽  
Load Carrying ◽  
Foamed Concrete ◽  
Ultimate Load Carrying Capacity

Recent years in Malaysia, precast concrete sandwich panel gained its popularity in building industries due to its economic advantages, superior thermal and structural efficiency. This paper studied the structural behaviour of precast lightweight foamed concrete sandwich panel (PLFP) with double shear truss connectors under eccentric load. Preliminary results were analysed and studied to obtain the ultimate load carrying capacity, load-deflection profiles and strain distribution across the panel thickness at mid depth. The achieved ultimate load carrying capacity of PLFP due to eccentric load from the experimental work was compared with values calculated from classical formulas (if it is more than 1 comparison) developed by previous researchers. Preliminary results showed that, the use of double shear truss connectors in PLFP was able to improve its ultimate load carrying capacity to sustain eccentric load and achieve certain compositeness reaction in between the wythes.

Effect of Limestone Powder in Self Consolidating Lightweight Foam Concrete

2018 ◽  
Vol 280 ◽  
pp. 469-475
Author(s):  
Ahmad Ruslan Mohd Ridzuan ◽  
M.A. Mohd Fauzi ◽  
Mohd Fadzil Arshad ◽  
M.S. Harun ◽  
N. Jasmi
Keyword(s):  
Carbon Dioxide ◽  
Compressive Strength ◽  
Construction Industry ◽  
Cement Content ◽  
Basic Component ◽  
Limestone Powder ◽  
Foam Concrete ◽  
Conventional Concrete ◽  
Main Component ◽  
Lightweight Foam

Self-Consolidating Lightweight Foam Concrete (SCLFC) is known as a concrete which has no requirement towards vibration or compaction effort due to its flowability and capability in filling and achieving full compaction in reinforcement. The main component in SCLFC is cement. Cement is a basic component of concrete that used in construction industry. However, it is also the main source of Carbon Dioxide (CO2) emission. If this component of concrete is replaced with other materials, it surely can help in reducing the emission of CO2. Limestone powder can be replacement with the cement content in SCLFC. Therefore, the aim of this paper is to determine the effect of limestone powder on SCLFC in term of flowability and compressive strength. The specimens were tested for compressive strength at 3, 7, and 28 days. The result indicated the flowability of SCLFC increase with the increase of percentages of limestone powder replacement. Meanwhile, the highest compressive strength of SCLFC containing 10% limestone powder replacement give better performance than the normal SCLFC. Based on the finding, SCLFC containing 10% limestone powder replacement can be categorized same as a conventional concrete hence it can be utilized for construction purposes. Limestone powder can also acts as an alternative replacement in concrete for replacing the cement.

Behaviour of steel–concrete–steel sandwich composite beams with lacing subjected to reversed cyclic loads

2017 ◽  
Vol 21 (6) ◽  
pp. 1799-1819 ◽  
Author(s):  
N Anandavalli ◽  
N Lakshmanan ◽  
J Rajasankar ◽  
GM Samuel Knight
Keyword(s):  
Energy Absorption ◽  
Composite System ◽  
Sandwich Composite ◽  
Dissipated Energy ◽  
Analytical Prediction ◽  
Hysteretic Model ◽  
Structural Behaviour ◽  
Concrete Core ◽  
Shear Connectors ◽  
Cover Plates

Steel–concrete–steel (SCS) sandwich composite system consists of steel plates covering both sides of the concrete core and connected by mechanical means such as shear connectors. In conventional steel–concrete–steel system, shear connectors are welded to the steel cover plates. Laced steel–concrete composite (LSCC) system is a new form of steel–concrete–steel, proposed earlier by the authors. In LSCC system, steel cover plates are connected in a novel way using lacings and cross rods and hence is devoid of welding. Proposed sandwich composite system is being evaluated systematically for its structural behaviour under various modes of loading for use in special structures under severe loading such as blast loading. Damage under cyclic loading and energy absorption are extremely important, which are highlighted in this paper. An experimental investigation on the cyclic response behaviour of two LSCC beams is carried out. Angle of lacing is the parameter that is varied between the two beams. Both the beams are found to exhibit similar behaviour on most of the aspects. The envelope of hysteretic response indicates mild softening behaviour after reaching peak value. Maximum load resisted under both sagging and hogging moment conditions is found to be nearly equal, thus making the LSCC system suitable for situations where reversal of loads are encountered. Dissipated energy is observed to be nearly the same for the load applied in the upward as well as in the downward direction. Analytical prediction on energy absorption capacity is carried out by adopting a hysteretic model with strength deterioration. Cyclic ductility factor is evaluated to be about 20 for LSCC beams, while support rotation is calculated to be about 8° and 10° for beams with 45° and 60° angles of lacing, respectively. Spalling of concrete is prevented in LSCC beams by the steel cover plates.

The Effect of Sand/Cement Ratio and Cement Grade on the Compressive Strength of Foam Concrete

2013 ◽  
Vol 405-408 ◽  
pp. 2933-2937
Author(s):  
Ji Chuan Geng ◽  
Kun Ni ◽  
Shan Qi Fang ◽  
Yun Xing Shi ◽  
Yi Ning Ding ◽  
...  
Keyword(s):  
Compressive Strength ◽  
The Other ◽  
Foam Concrete ◽  
Cement Ratio ◽  
Series Of Experiments

A series of experiments have been undertaken to investigate the effects, on compressive strength, of variable sand/cement ratios and cement grade. Ten mixtures of different s/c ratios used two kinds of cement were cast and the compressive strength at different curing ages was tested. The results indicate that the compressive strength gets lower as the s/c ratio increases for both 42.5R and 32.5R cement. For the mixtures used 32.5R cement, the 28-day compressive strength is pretty low for the s/c ratios of 1.5 and 2. The specimens used 42.5R cement have higher compressive strength than those with 32.5R cement. The compressive strength decreases from 42.5R to 32.5R cement are significantly smaller for the s/c ratios of 0.5 and 1 than the other three s/c ratios.

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