Name: masonry paving materials and base layers
Uploaded: 2024-09-12T16:16:29.000Z
Duration: 1 min 21 s
Channel: JoVE

石積みの舗装は、歩行者用通路、建物の入り口、パティオ、そして時には私道で使用されます。
レンガ、石、さまざまな形状や色のコンクリート石積みユニットを使用して構築されており、適切な強度と耐摩耗性と耐候性を備えています。
これらの舗装ユニットは、ベースレイヤー上に広げられたセトリングベース上に置かれます。
セトリングベッドは、砂、エンドウ豆の砂利、または舗装ユニットを水平にするのに役立つ細かく砕いた石の厚さの1〜2インチの層で構成されています。
重い車両荷重を受ける舗装の剛性ベース層は、鉄筋コンクリートまたは非鉄筋コンクリートで作られている場合があります。
一方、歩行者専用道路は、アスファルトまたは瀝青コンクリートで作られた半柔軟なベースレイヤー、または砂利または砂で作られた柔軟なベースレイヤーを使用します。
透水性舗装は、舗装に降った雨水が舗装を通過して下地の土壌に浸透するため、雨水排水路への流出が最小限に抑えられます。
これは、ユニットの間に砂や植えられた土をユニットの間隔を空けるか、浸透性コンクリートやオープン舗装ブロックなどの多孔質舗装材を使用することで確保されます。

石積み舗装

石積み舗装の建設には、レンガ、石、コンクリートなどの材料が使用されます。これらの材料は、形状、色、強度、摩耗や風化に対する耐性を考慮して選択されます。石積みユニットは、砂と砂利の薄い層の上に乾いた状態で設置することも、コンクリートスラブ上のモルタルやアスファルトに埋め込むこともできます。車両の重い負荷がかかるエリアでは、補強コンクリートまたは補強なしのコンクリートの堅固な基礎が推奨されます。対照的に、歩行者通路では、アスファルトまたはビチューメンコンクリートの半柔軟性ベース、または砂利または砂の柔軟性ベースが使用されることがよくあります。舗装ユニットとベース層の間に挟まれた層である敷石は、通常 2.54 ～ 5.08 センチメートルの厚さで、小石または細かく砕いた石で構成されています。敷石の主な機能は、ベースまたはユニット自体の凹凸を平らにすることです。舗装の最新機能として、雨水が舗装を通り抜けて下層土に浸透するように設計された透水性舗装システムがあります。この機能は、透水性舗装ブロックなどの多孔質材料を使用するか、従来の舗装ユニットの間に砂や植生土壌を充填した空間を設計することによって実現されます。このようなシステムは、自治体の排水システムへの負担を軽減し、地下水の補充に貢献します。

石積みの舗装は、歩行者用通路、建物の入り口、パティオ、そして時には私道で使用されます。
レンガ、石、そして...

Education

JoVE Core

Civil Engineering

土木工学

Unit 1

ユニット1

Masonry

組積造

KEY TERMS AND CONCEPTS

主要用語と概念

Masonry Paving

masonry paving materials and base layers

Masonry paving uses bricks, stones, and concrete masonry units to create durable walking and driving surfaces. These materials are selected for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be used in different paving setups depending on the site and the load they must carry.

Some paving systems are installed dry on a thin sand layer over a gravel base. Others are set in mortar or asphalt on a concrete slab. For areas with heavy vehicular loads, a rigid base made of reinforced or unreinforced concrete is often recommended. Pedestrian paths usually use a semi-flexible base of asphalt or bituminous concrete, or a flexible base of gravel or sand.

A key part of the system is the setting bed. This is the layer between the paving units and the base layer. It is usually 1 to 2 inches thick and made of pea gravel or finely crushed stone. Its main job is to level irregularities in the base or in the paving units themselves.

Modern masonry paving can also be designed as permeable paving. In this system, rainwater can pass through the pavement and soak into the soil below. Builders may use porous materials such as pervious paving blocks, or they may leave spaces between standard paving units and fill them with sand or vegetated soil. These systems can help reduce stress on municipal drainage systems and support groundwater replenishment.

Masonry Paving Materials and Base Layers

composite masonry walls

Bonding and Materials in Composite Masonry

Composite masonry walls use two or more wythes, or vertical layers, of masonry to form one unified wall. The wythes may use the same material or different masonry materials. They are joined to work together as a single structure. These wythes can be bonded in several ways. Builders may use mortar-filled collar joints, grouted spaces, or rigid metal ties with reinforcement. Masonry header units can also connect the layers, but this method is rare. Metal ties are often preferred because they...

masonry cavity walls

Masonry Cavity Walls and Moisture Control

Masonry cavity walls use two wythes, or layers, with a hollow space between them. The outer and inner wythes are linked only by corrosion-resistant metal ties. This design helps manage water and improve wall performance. When rainwater passes through the outer wythe, it moves down through the cavity. Flashing catches the water and directs it toward weep holes, where it can leave the wall. The inner wythe often has damp-proofing on the cavity side. This layer also works as an air barrier. The...

masonry loadbearing walls

How Masonry Walls Support Buildings

Masonry load-bearing walls support floors and roofs and carry those loads down to the foundation. They are built from brick, stone, or concrete masonry units. These walls rely on compressive strength, which means they can resist pushes from above very well. Masonry walls may be reinforced or unreinforced, depending on the building needs. They carry dead loads and live loads while using working stresses that stay below the materials' ultimate strength. That safety margin helps the structure...

masonry curtain walls

Masonry Curtain Walls and Support Systems

Masonry curtain walls use brick or stone veneer as an exterior cladding system. The veneer is supported by the building structure, so the wall can be both attractive and functional. Two main construction methods are used for these walls. One method builds the masonry units in place through traditional layering. The other uses prefabricated panels that are assembled on the ground and then lifted into position. In traditional construction, steel shelf angles attached to the spandrel beam carry...

posttensioned masonry walls

How Masonry Walls Gain Extra Strength

Post-tensioned masonry walls gain extra strength from high-strength steel rods or flexible tendons. These tensioning elements are anchored to the foundation and run vertically through the wall. In some walls, they sit inside the cores of the masonry units. In others, they are placed between the masonry wythes, or layers. The wall is built first with the tensioning elements already in place. After the mortar cures fully, the wall is tightened. Steel rods are tensioned by turning nuts against...

cavity drainage and flashings in masonry walls

cavity-drainage-and-flashings-in-masonry-walls

Moisture Control in Masonry Cavity Walls

Masonry cavity walls use a gap between two wythes, or wall layers, to help control moisture. The cavity is usually at least 2 inches wide, and it may contain insulation. Even with insulation, a clear space of at least 1 inch is kept so water can drain away. Some walls also use a continuous drainage mat to reduce the needed space while still moving moisture out. Weep holes are another key part of cavity drainage. These openings sit at the base of the cavity and let collected water escape. They...

thermal insulation in masonry walls

Masonry Wall Insulation Options

Masonry wall insulation can be placed on the outside, inside the wall, or on the interior surface. The best choice depends on the climate, the building design, and whether the wall is being built new or retrofitted. In hot, dry climates, masonry can help smooth indoor temperatures by absorbing heat during the day and releasing it at night. In many other climates, extra insulation is needed to improve thermal resistance. One common exterior method is an Exterior Insulation and Finish System, or...

expansion and contraction in masonry walls

expansion-and-contraction-in-masonry-walls

Masonry Wall Joints for Temperature and Moisture

Masonry walls change size slightly as temperature and moisture change. Builders account for this movement so the wall does not crack or shift out of place. Thermal movement is usually easy to measure and plan for. Moisture movement is harder to predict. New clay masonry units often absorb water and expand over time in normal outdoor conditions. New concrete masonry units behave differently. They usually shrink as they lose extra moisture gained during production. These opposite changes make...

movement joints in buildings

How Buildings Handle Structural Movement

Buildings are designed to handle movement from temperature changes, moisture changes, and structural deflection. If these changes are ignored, they can cause visible damage or even unsafe conditions. Movement joints give building materials room to move without creating distress. Working joints are the simplest type. They are placed during construction and help materials cope with change as the building goes up. Shingled roofs and wood bevel siding are common examples because they can move with...

types of building separation joints

Building Joints for Movement and Stability

Building separation joints help large or complex buildings move in a controlled way. They split a structure into smaller, separate units. This reduces stress when the building shifts under different forces. The joints are grouped into three main types: volume-change joints, settlement joints, and seismic separation joints. Volume-change joints handle expansion and contraction caused by temperature changes and moisture changes. They are placed where the building mass has discontinuities,...

efflorescence in masonry

Stopping White Salt Crystals on Masonry

Efflorescence is the white, fluffy crystal layer that can form on masonry walls. It happens when water-soluble salts in brick, stone, concrete, or mortar are dissolved by water and carried to the surface. When the water evaporates, the salts are left behind as a powdery deposit. New efflorescence is often seen soon after construction. In many cases, it can be cleaned with water and a brush. It may also fade over time as rain leaches salts out of the masonry surface. If efflorescence appears...

mortar joint deterioration in masonry

Repairing Damaged Mortar Joints in Masonry

Mortar joints in masonry can break down when water collects in them and freezes. The repeated freezing and thawing makes the water expand and shrink. That process creates cracks in the joints and can spread damage over time. As the mortar worsens, pieces may spall, or break off from the joint surface. Loose masonry units can follow, and the wall becomes weaker. Damaged joints also let moisture move into the wall, which adds to the problem. Good construction helps protect mortar joints. Using...

masonry in cold and hot weather conditions

masonry-in-cold-and-hot-weather-conditions

Protecting Mortar During Weather Changes

Masonry work changes in cold and hot weather because mortar must stay at the right temperature and moisture level. If mortar freezes before it cures, its strength and watertightness can drop. For proper hydration and curing, mortar should stay between 60°F and 80°F. When the weather is below 40°F, the water used for mortar must be heated. The water should not exceed 120°F, because very hot water can reduce compressive strength and bond strength. Masonry units and sand should also stay dry and...

masonry paving

Masonry paving uses bricks, stones, and concrete masonry units to create durable walking and driving surfaces. These materials are selected for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be used in different paving setups depending on the site and the load they must carry. Some paving systems are installed dry on a thin sand layer over a gravel base. Others are set in mortar or asphalt on a concrete slab. For areas with heavy vehicular loads, a...

key terms and concepts

Learn how masonry paving uses bricks, stone, and concrete units, plus sand, gravel, asphalt, and concrete base layers for paths, driveways, and permeable pavement.

Masonry Paving Materials and Base Layers | JoVE K12

JoVE Core Civil Engineering provides a foundational exploration of essential construction materials in civil engineering, focusing on bricks, stones, steel, wood, and concrete through easy-to-understand animated videos. This collection covers the properties, manufacturing processes, and practical applications of these materials. Additionally, the accompanied science-in-action videos demonstrate the research experiments performed in laboratories.

civil engineering

Masonry Paving Materials and Base Layers

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