Sumitomo Metal Mining Siporex Co.

Japan

Sumitomo Metal Mining Siporex Co.

Japan
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Roberts J.,Sumitomo Metal Mining Siporex Co.
Cement, Wapno, Beton | Year: 2011

On March 31 st 2020 the UK masonry design code, BS 5628 [1-3], was withdrawn leaving BS EN 1996 (Eurocode 6) [4-7] and the associated National Annexes [8-11] as the structural masonry code for the UK. BS 5628 was the first limit state design code for masonry in the world when it was introduced in 1978 and allowed efficient use of both slender walls and low strength units. Eurocode 6 has brought together from the participating countries input from a wide spectrum of designers including those from countries where thicker masonry walls are normally used. This paper examines the effect of some of the change in the design code on the potential use of autoclaved aerated concrete and identifies areas of the Eurocode that need further consideration and development.


Matsushita F.,Sumitomo Metal Mining Siporex Co. | Aono Y.,Sumitomo Metal Mining Siporex Co. | Shibata S.,Sumitomo Metal Mining Siporex Co.
Cement, Wapno, Beton | Year: 2011

Carbonation cracking and its mechanism of AAC have not been reported at all. One of the possible mechanisms of carbonation cracking caused by carbonation shrinkage is investigated. Carbonation shrinkage at the occurrence of cracking was approximately 0.12% both for field study and accelerated carbonation, while carbonation degree was approximately 50% and 35%, respectively. Tensile stress in AAC was calculated to reach tensile strain capacity (0.04-0.05%) at the occurrence of cracking both for field study and accelerated carbonation data. In other words, the proposed mechanism of carbonation cracking was certified.


Edgell G.J.,Sumitomo Metal Mining Siporex Co. | Fudge C.A.,Sumitomo Metal Mining Siporex Co.
Cement, Wapno, Beton | Year: 2011

Reinforced AAC panels in the UK have been used in past, but these tended to be acting as roof units and to a limited extent floor units, with walling elements occasionally used horizontally as fire walls or thinner vertical elements for partitions. In more recent times, their use in housing has been explored as a series of vertical storey height, solid wall elements (each element being 600 mm wide) to form the outer fabric of construction. In this form of construction a thickness of 200 mm will act as the main load-bearing component of the structure as well as making a significant contribution to the overall thermal performance of the building. The vertical load resistance can be determined using the European Standard EN 12602. However, little data existed in the UK to enable the design of the walls to resist horizontal lateral load and resistance to racking. This paper reports on some preliminary tests to determine the vertical and horizontal spanning capacity of walls made with large elements. These tests were on storey height walls or 1 m high walls each 2.4 m long for the determination of their vertical and horizontal spanning capacity respectively. The walls were built off a slip plane to ensure as little friction at the base as possible, loads were applied using air bags. The racking tests followed the principles of EN 594 which applies to timber structures. The modes of failure in the flexural tests were as expected although the results were quite variable. In the racking tests localised failure occurred at the point of applying the racking load in half of the tests although the results were not so low as to be discounted. Further tests are needed to establish the variability to be expected and to eliminate the localised failure in the racking tests.


Matsushita F.,Sumitomo Metal Mining Siporex Co. | Aono Y.,Sumitomo Metal Mining Siporex Co. | Shibata S.,Sumitomo Metal Mining Siporex Co.
Cement, Wapno, Beton | Year: 2011

Quartz sand is generally used as a siliceous raw material for AAC production. The growth rate of tobermorite during autoclaving is controlled by dissolution of silica from quartz sand. And also, the theoretical proportion of dissolution of silica from quartz sand depends on Ca/Si ratio of raw materials. Therefore particle size distribution of quartz sand is very important for the production efficiency as well as the mechanical properties of AAC. In this paper, the optimal particle size distribution of quartz sand will be proposed.


Morita K.,Fukuoka University | Yasunaga A.,Sumitomo Metal Mining Siporex Co. | Takayama M.,Fukuoka University
NCEE 2014 - 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering | Year: 2014

In order to protect people, buildings and other important facilities from damage caused by earthquakes, seismic isolation systems have been developed. In Japan, many buildings are protected using seismic isolation with supplemental damping, including U-shaped lead dampers. Lead is used as the energy dissipation component of these dampers, because pure lead has the characteristics of low yield stress and very high ductility with minimal strain hardening. The U-shaped lead damper has an internal kink like U-shape, which decreases the vertical tension force that could be developed through geometrical nonlinearity combined with large horizontal deformation. The hysteretic behavior of this damper is elasto-plastic, and this allows it to provide high levels of damping performance. However, the formation of fatigue cracks on the surface of the lead, caused by small oscillations due to wind or traffic vibration, affects the damping properties of the damper. Although it is known that the fatigue properties of lead can be improved by a vaseline-coating or a grease-coating on the specimen surface, the effect of the coating is not well understood, qualitatively and quantitatively. To clarify this effect, we carried out two types of tests: (1) very small deformation cyclic tests under similar actual conditions using a full-size, U-shaped lead damper, and (2) rotating-bending fatigue tests on pure lead round bars. Based on the results of these tests, a grease-coating is identified as an effective method of fatigue life enhancement.

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