Можно ли класть газобетон на цементный раствор: Клей для газобетона – виды, характеристики, свойства кладочных растворов для газобетонных блоков

Газобетон на цементный раствор. Можно ли класть газоблоки на цементный раствор? Что необходимо при монтаже газобетонных блоков

Почему клей, а не раствор — преимущества тонкого шва

Прежде всего отмечу, что клей можно использовать только для автоклавных блоков, которые обладают точной геометрией. Применять клей для неавтоклавного пенобетона не стоит, так как наносить его толстым слоем нельзя, а при тонком нанесении образуются щели.

Что же касается автоклавного газобетонного, или газосиликатного блока, применение специального клеевого раствора при его укладке дает ряд преимуществ:

• Уменьшение мостиков холода . Раствор между блоками обладает высокой теплопроводностью, так как не имеет заполненных воздухом ячеек, как пенобетон. Поэтому, чем уже шов, тем меньше мостики холода, соответственно, теплей жилье;

• Повышение прочности . Швы в любой кладке — это наименее прочные участки стены. Поэтому уменьшение толщины шва повышает ее несущую способность;
• Хорошая адгезия . Клей обладает лучшей адгезией к блокам, чем обычный раствор. Это также улучшает прочность кладки;
• Повышает скорость строительства стен . В процессе строительства стен приходится гораздо реже отвлекаться на приготовление раствора. Кроме того, клей наносится быстрей, чем раствор;

К минусам относится только то, что клей можно наносить лишь тонким слоем. Как я уже говорил, это ограничивает область его применения. В частности, для первого ряда блоков клей обычно не применяют.

Что представляет собой клей — состав и виды

Клей для газобетона состоит из следующих компонентов:

• Портландцемента;
• Минеральных наполнителей;
• Органических модификаторов;
• Полимерных добавок.

Как вы видите, клей выполнен тоже на основе цемента, но благодаря модифицирующим добавкам и наполнителям его свойства сильно отличаются от обычного цементно-песчаного раствора.

Отмечу, что все существующие клеи делятся на два вида:

• Летние . Предназначены для выполнения работ при температуре выше 5 градусов;
• Зимние . Можно использовать при температуре до -15 градусов и ниже.

Несколько слов о выборе

Как выбрать лучшую клеевую смесь

Несмотря на то, все клеевые составы состоят практически из одних и тех же компонентов, характеристики у них зачастую разные. Поэтому при выборе уделяйте внимание следующим параметрам:

• Прочности . Прочность на сжатие качественного клея спустя 28 суток составляет 6-7 МПа. Для наружных несущих стен желательно не применять составы с прочностью менее 5 МПа;
• Адгезия . Должна быть не менее 0,2 МПа. Желательно использовать составы с адгезией 0,5-0,6 МПа;

• Время использования раствора . Как правило,

90000 How Concrete is Made (New Research) — Cement Concrete 90001 90002 90003 90004 How concrete is made: 90005 — 90006 Concrete is a fluid mixture of 90003 cement, water, sand, and gravel 90006. Concrete can be cast into molds or forms and will Harden to create the necessary components of a concrete structure. Are You interested to know about the Microstructure of Concrete? Here is a 90003 New Research 90006 on the Microstructure of Concrete. 90011 90012 Chemical Reaction and Hydration 90013 90002 The setting and hardening of 90003 concrete 90006 is caused by a chemical reaction between Portland cement and water, his can be demonstrated by adding a small amount of cement to water containing an indicator the rapid development of a blue color reflects the release of 90003 hydroxyl ions 90006 from the dissolving cement the chemical reaction between cement and water is called hydration.90011 90002 Related: — High strength concrete properties, strength, admixture, and mix design 90011 90022 Fig1.Ingredients of Concrete 90002 The dissolving cement increases the levels of calcium and silicon in the solution, when the concentrations of dissolved species reach critical levels new solid products are formed through a precipitation reaction this is a sketch of cement grains suspended in water. 90011 90002 The solid 90003 hydration 90006 products form coatings around the particles of cement and gradually fill the space between, when the coatings first begin to impinge setting occurs, there is a steady development of strength as the coatings grow together the amount of strength attained by the mixture of cement and water depends on how effectively the space between the grains is filled up.90011 90002 Concrete will 90003 harden within a few hours, 90006 but hydration 90003 continues for weeks even years 90006 after placement. Here is a picture of cement particles before exposure to water dry cement is a fine powder and the particles are not attached to each other after the cement is mixed with water and allowed to stand. 90011 90002 The picture is quite different now, the particles are grouped together and attached by solid material that provides structural integrity.Scientists at the National Institute of Standards and Technology have learned how to 90003 simulate cement hydration 90006 on a computer using computer simulation. 90011 90002 Hydration is speeded up to occur in minutes rather than days before the hydration. 90003 Simulation particles 90006 of cement are arranged on the computer display, the computer determines regions of the particles that can dissolve into water. 90011 90002 The bits of dissolved cement 90003 diffuse 90006 through the water in a random manner and react to form solid phases.According to certain rules after a cycle of 90003 dissolution diffusion and precipitation 90006 is complete the computer proceeds with another cycle as this process repeats again and again. 90011 90012 90050 Microstructure of Concrete 90013 90002 The 90003 microstructure 90006 develops building bridges between particles that provide strength to the material, computer simulation has proved valuable because it allows researchers to test conditions and make measurements that are difficult to achieve in real life.At the end of the hydration simulation, the structure of the hardened cement paste is very similar to that observed under the microscope. 90011 90002 Hydration is an exothermic process which generates heat through chemical reactions, the process of hydration can be easily followed by monitoring the production of heat that accompanies the reactions, 90011 90002 this is done by sipping mortar from a batch of concrete and weighing it into a bottle which is placed into an insulated container, a 90003 Thermistor 90006 is that embedded into the fresh 90003 mortar 90006, the output of the thermistor can be recorded by a computer, the results of this experiment can be plotted as a 90003 curve of temperature versus time 90006.90011 90002 90003 Read more 90006: Manufacturing of Portland Cement — Process and Materials 90011 90002 The area under the major peak can be related to early strength development, the initial dissolution of cement Purdue is a short release of heat shown by the first peak in the calorimetry curve. 90011 90002 After the initial dissolution hydration products are quickly precipitated on the surface of each cement particle, the layer acts as a protective barrier and temporarily delays the further dissolution of the particle, this slows down the reaction for a period of several hours and is called the dormant period.90011 90002 The existence of the 90003 90004 dormant period 90005 90006 allows concrete to be transported to the construction site and placed and finished in the forms, the end of the dormant period represents the beginning of setting, at which time the cement again starts to react more rapidly with water as new hydration products are formed. 90011 90002 Scientists are using measurements of other properties to monitor concrete setting and hardening, 90003 researchers 90006 often need to know what portion of the cement has hydrated.90011 90012 90050 Measure of Degree of Hydration 90013 90002 The degree of hydration can be estimated by heating a sample of cement paste and measuring weight loss as a function of temperature using 90003 thermal gravimetric analysis 90006 equipment, the free water in a sample is driven out by heating to 105 degrees Celsius at 105 degrees . The sample is dry but still retains its strength. 90011 90002 The water involved in the hydration reactions is chemically combined with the cement it can be driven out of the sample by heating to 1,000 degrees at 1000 degrees all of the original mix.water has been removed from the sample. The degree of hydration is calculated from the weight of chemically combined water, a typical cement paste cured in moist conditions will reach a 90003 degree of hydration 90006 of about 90003 80% in 28 day 90006 s, 90011 90002 The 90003 electrical properties 90006 of cement or mortar samples can be followed over time, leading to profiles of changes in electrical resistance, the electrical properties of this cement specimen are being measured using the two metal roads and equipment that measures resistance and impedance.90011 90002 This chart illustrates how the resistance of electricity through the cement increases as the cement hydrates at early ages, the water easily conducts current across the specimen but when hydration products fill in the open spaces within the specimen electrical current can not pass as easily, in this way the electrical properties can be related to the degree of hydration. 90011 90002 The resistance and impedance of cement is a topic of research that may someday change the way we test fresh concrete in the field.The fluid properties of concrete are very important in the field because quality construction demands adequate consolidation. 90011 90002 The 90003 90004 standard slump test 90005 90006 provides a coarse measure of concrete workability, this test is widely utilized because it is easy to conduct in the field, fluid properties are also the subject of research in the lab because of the flow of cement changes as hydration proceeds. Properties such as viscosity and the initial resistance to flow are used to characterize liquid materials.90011 90002 Water is a liquid with low viscosity and low initial resistance to flow but the concrete mortar and fresh cement paste have a much higher viscosity than water. 90011 90002 Vibration is often used to overcome this resistance in concrete in the lab, fluid properties of cement paste can be measured with this Brookfield 90003 Rheometer, 90006 researchers use larger equipment such as this Tattersall rheometer to measure the properties of mortar and concrete. 90011 90002 90050 The 90003 Rheological equipmen 90006 t can be used to measure the initial resistance to flow, which is referred to as yield stress at the time of setting.The yield stress starts to increase and the ability to flow is lost, researchers are interested in flow characteristics to understand, how the process of hydration stiffens the fresh concrete and leads to set in the concrete. 90011 90002 The rate of hydration can be controlled several ways factors such as temperature, cement type, and 90003 admixtures 90006 influence the rate, one of the most important variables is the ambient temperature, high temperatures speed up hydration, so that setting is faster as well as subsequent strength development.90011 90002 The opposite occurs when the temperature is lowered, a good rule of thumb is that for every 10 degrees Celsius change in temperature the rate of hydration is changed by a factor of two, for example, an increase in temperature from 20 degrees Celsius to 30 degrees Celsius doubles the rate of 90003 90004 hydration 90005 90006, it is important to remember that when the weather gets cooler concrete is slow to harden and must be kept in forms for a longer period of time. 90011 90002 Hydration of concrete can also be controlled by using different types of cement to counteract the effects of high or low temperatures in the field, for example, the use of 3 types of cement counteract cold temperatures because they hydrate faster, there are also special chemicals that regulate hydration accelerators can be added to concrete to make hydration proceed faster.90011 90002 Set retarders slow hydration these materials are widely available. 90011 90002 In summary, 90003 hydration is a chemical reaction 90006 between the cement and water that bind the cement particles and the aggregate in concrete into a strong, and during mass one of the important advantages of concrete over other construction materials is that, it is mixed and formed on site and it can take on 90004 90003 very large and flex. 90006 90005 The ability of concrete to quickly gain strength makes it a valuable material for 90003 roads, buildings, bridges, and other important structures 90006.90011 90002 90003 90004 You’ll also Like: 90005 90006 90011 90002 (Visited 1,344 times, 1 visits today) 90011 90012 Continue Reading 90013 .90000 Masonry Mortar For Aerated Concrete Blocks 90001 90002 90003 Introduction: 90004 90005 an adhesive mortar for quick and secure laying of aerated lightweight concrete blocks and panels. For thin-bed laying with increased productivity and resistance against water penetration. It is specially formulated to give good workability, adhesion and water retentivity to facilitate optimum strength development. 90006 90002 A high quality cementitious adhesive specifically formulated for installation of AAC products such as blocks, panels and lintels.Backed by extensive testing and historical performance, the use of the adhesive ensures optimum compatibility and performance of the completed installation including strength and fire rating, SA mortar can be applied for interior and exterior use on horizontal and vertical surfaces. 90005 90003 Feature: 90004 90005 1) Weatherproof, and resistant to frost after hardening 90006 90002 2) Strong friction bond due to the adjustment of the water retention properties to suit the absorbency characteristics of the aerated concrete 90006 90002 3) NO rapid loss of water , or loss of water to the subsurface 90006 90002 4) Easy correction of brick position after the brick has been laid 90006 90002 5) Good workability 90006 90002 6) Fulfills the mortar requirements for subsequent thin plastering 90006 90002 Application: 90005 1) Special dry mortar for bonding extremely absorbent aerated-concrete high-precision units and elements 90006 90002 2) For thin mortar joints, 1 to 3 mm thick 90006 90002 3) For application using a mortar sledge or thin-bed roller.90005 4): Can be used to the decorative face brick in the cold area and plant, used as brick gas.wall brick adhesive uses high quality concrete as raw material, its a kind of high class adhesive material improved by science method, all kinds of property indexes accord with JC890-2001 standard 90005 5): Good waterproof performance, can avoid wall permeating effectively if uses this product sticking bricks 90005 6): Brick and the wall can stick together without wetness, dramatically improve process efficient 90006 90002 Technical Date : 90006 90035 90036 90037 90038 90002 Intensity level 90006 90041 90038 90002 M2.5 M15 90006 90002 M5.0 M20 90006 90002 M7.5 M25 90006 90002 M10 M30 90006 90041 90052 90037 90038 90002 Consistency (mm) 90006 90041 90038 90002 Less than or equal to 90 90006 90041 90052 90037 90038 90002 Water retention (%) 90006 90041 90038 90002 Greater than or equal to 90 90006 90041 90052 90037 90038 90002 28 days compressive strength (Mpa) 90006 90041 90038 90002 ≥Its intensity level 90006 90041 90052 90037 90038 90002 28 days Shrinkage (%) 90006 90041 90038 90002 ≤0.5 90006 90041 90052 90093 90094 90002 Picture: 90006 90002 90006 .90000 Biaoyuan Masonry Mortar For Aerated Concrete Blocks 90001 90002 BiaoYuan Masonry Mortar for Aerated Concrete Blocks 90003 Introduction: 90003 Masonry mortar is a ready-to-mix, self-curing cementitious mortar for mounting AAC blocks. Benefit from a super-strong mechanical bond between blocks with its innovative thin bed solution. 90003 Feature: 90003 1): Weatherproof, and resistant to frost after hardening 90007 90002 2) Strong friction bond due to the adjustment of the water retention properties to suit the absorbency characteristics of the aerated concrete 90007 90002 3) NO rapid loss of water, or loss of water to the subsurface 90007 90002 4) Easy correction of brick position after the brick has been laid 90007 90002 5) Good workability 90007 90002 6) Fulfills the mortar requirements for subsequent thin plastering 90007 90018 Application: 90019 90002 1) Special dry mortar for bonding extremely absorbent aerated-concrete high-precision units and elements 90007 90002 2) For thin mortar joints, 1 to 3 mm thick 90007 90002 3) For application using a mortar sledge or thin-bed roller.90003 4): Can be used to the decorative face brick in the cold area and plant, used as brick gas.wall brick adhesive uses high quality concrete as raw material, its a kind of high class adhesive material improved by science method, all kinds of property indexes accord with JC890-2001 standard 90003 5): Good waterproof performance, can avoid wall permeating effectively if uses this product sticking bricks 90003 6): Brick and the wall can stick together without wetness, dramatically improve process efficient 90007 90002 90007 90002 Technical Date: 90007 90002 90007 90035 90036 90037 90038 Appearance 90039 90038 Grey powder 90039 90042 90037 90038 Pot Life 90039 90038 90min 90039 90042 90037 90038 Open Time 90039 90038 10-15min 90039 90042 90037 90038 Tensile adhesion strength 90039 90038 28days 90039 90042 90037 90038 Intial 90039 90038> 0.5mpa 90039 90042 90037 90038 After Immersion 90039 90038> 0.5MPA 90039 90042 90037 90038 Compressive Strength 90039 90038 7.5 Mpa 90039 90042 90037 90038 Operational time 90039 90038 4H 90039 90042 90037 90038 Certification 90039 90038 ISO and Test Report 90039 90042 90091 90092 90002 90007 90002 90007 90002 Picture: 90007 90002 90003 90007 .90000 Cement Mortar | Estimation of Cement, Sand & Water in Mortar | Types of Mortar & Applications 90001 90002 90003 Cement Mortar 90004 is one of the most common and cheapest binding materials used in construction industry. Cement 90003 mortar 90004 is basically a mixture of 90003 cement, sand & water 90004. It is used in various aspects of civil engineering works such as masonry, brickwork, plastering, flooring etc. There are two types, 90003 dry mortar and wet mortar 90004. 90011 90002 Dry Mortar primarily constitutes of only sand and cement.To calculate the quantity of sand and cement for a dry mortar, a standard mix proportion should be chosen from the various mix ratios available. (1: 1, 1: 2, 1: 3, 1: 4, 1: 6, 1: 8) 90011 90002 90003 Cement 90004 90011 90002 + water (& admixtures) → 90003 cement paste 90004 90011 90002 + fine aggregate → 90003 mortar 90004 90011 90002 + coarse aggregate → 90003 concrete 90004 90011 Mixing of Cement-Sand Mortar (Source: YouTube / SkillTrain) 90030 Estimation of Water, Cement & Sand quantity for Cement Mortar 90031 90002 Let us assume a standard quantity of 1m 90033 3 90034 Cement mortar and a mix proportion of CM 1: 6 (1 part Cement & 6 parts Sand).The quantity can calculated in two ways, one is by weight and the other by volume. Let us consider the 90003 volume method 90004 for the calculation of cement & sand quantity. 90011 90002 Dry quantity of mortar is equivalent to 1.2 to 1.3 times the quantity of wet mortar. This is due to the fact that voids are present in aggregates and cement. Actual value depend on the void ratio of the ingredients which are being used. 90011 90002 Hence, let us assume the quantity of dry cement mortar mix as 1 × 1.3 = 90003 1.3m 90033 3 90034 90004. 90011 90002 The basic formula to calculate the volume of an ingredient is as follows: 90011 90002 Volume of dry ingredient = Volume of dry mortar x (Parts by volume of ingredient / Total parts of ingredient) 90011 90002 = 1.3 x (Parts by volume of ingredient / Total parts of ingredient) 90011 90052 Quantity of cement in Cement Mortar 90053 90002 Here, for 1: 6 mix, total number of ingredients in the mortar is 90003 6 + 1 = 7. 90004 90011 90002 Hence, volume of cement in mortar = Volume of dry mortar x (Parts of cement / Total parts of ingredient) 90011 90002 = (1.3 × 1) / 7 = 0.185 m 90033 3 90034 90063 Since the cement is available in bags, volume of 1 cement bag (50kg) is 0.0347 m 90033 3 90034. 90011 90002 0.185 m 90033 3 90034 = (1.3 × 1) / (7 × 0.0347) = 5.35 bags 90011 90052 Quantity of sand 90053 90002 Volume of sand is = Volume of dry mortar x (Parts of sand / Total parts of ingredient) 90011 90002 = (1.3 × 6) /7=1.14 m 90033 3 90034 of sand or fine aggregate 90011 90052 Quantity of Water 90053 90002 For wet mortar recommended water-cement ratio varies from 0.4 to 0.6. Further, water requirement depends on any admixture added to mortar to improve its workability. Admixtures must be added as per suppliers specifications. Hence, water required 90011 90002 = 5.35 bags x 0.0347 = 0.11 m 90033 3 90034 water 90011 90002 = 0.11 x 1000 l = 111 liters of water 90011 90002 Apart from this, labour is also required for the purpose of batching and mixing of the cement mortar. 90011 90052 Mortar Material Cost Estimate: 90053 90002 Volume of wet mortar = 1m 90033 3 90034 90011 90002 Volume of dry mortar = 1.3m 90033 3 90034 90011 90002 Mix Ratio = 1: 6 90011 90002 Quantity of cement = 5.35 bags 90011 90002 Quantity of sand = 1.14 m 90033 3 90034 90003 90004 90011 90111 90112 90113 90114 90003 Sl. No. 90004 90117 90114 90003 Material 90004 90117 90114 90003 Quantity 90004 90117 90114 90003 Unit 90004 90117 90114 90003 Rate 90004 90117 90114 90003 Amount 90004 90117 90138 90113 90114 1. 90117 90114 Cement 90117 90114 5.35 90117 90114 Bags 90117 90114 Rs. 350 90117 90114 Rs.1,872.5 90117 90138 90113 90114 2. 90117 90114 Sand 90117 90114 1.14 90117 90114 m 90033 3 90034 90117 90114 Rs. 1250 90117 90114 Rs. 1,425 90117 90138 90113 90114 90117 90114 90117 90114 90117 90114 90117 90114 90003 Total 90004 90117 90114 90003 Rs. 3,297.5 90004 90117 90138 90187 90188 90052 Estimation of labour cost for Cement Mortar 90053 90002 1 Mazdoor = 0.27 days 90011 90002 1 Bhishti = 0.07 days 90011 90111 90112 90113 90114 90003 Sl.No. 90004 90117 90114 90003 Labour 90004 90117 90114 90003 No. of days 90004 90117 90114 90003 Wage per day 90004 90117 90114 90003 Amount 90004 90117 90138 90113 90114 1. 90117 90114 Mazdoor 90117 90114 0.27 90117 90114 Rs. 400 90117 90114 Rs. 108 90117 90138 90113 90114 2. 90117 90114 Bhishti 90117 90114 0.07 90117 90114 Rs. 350 90117 90114 Rs. 24.5 90117 90138 90113 90114 90117 90114 90117 90114 90117 90114 90003 Total 90004 90117 90114 90003 Rs.132.5 90004 90117 90138 90187 90188 90052 Total Estimation of Cement Mortar 90053 90002 Sum of material and labour cost = 3,297.5 + 132.5 = 90003 3430 / — 90004 90011 90002 Assume 1.5% for 90003 water charges 90004 = (1.5 / 100) x 3430 = 51.45 / — 90011 90002 Assume 10% for 90003 contractor’s profit 90004 = (10/100) x 3430 = 343 / — 90011 90002 Total Cost = 3430 + 51.45 + 343 = 90003 3,824.45 / — 90004 90011 90030 Types of Cement Mortar based on its applicability 90031 90052 Type N mortar 90053 90002 It is generally used for internal and external plastering of parapet walls, exterior walls and interior walls.It is also best suitable for flooring. The initial and final setting time ranges from 2 hours and 24 hours respectively. It has the lesser compressive strength in comparison with the other types of mortars. Its compressive strength ranges from 700-900 psi (5 to 7 Mpa). 90011 Cement Mortar used for Flooring (Source Youtube-UltraTech Cement) 90052 Type S mortar 90053 90002 This type of mortar can only be used on load bearing exterior walls, interior walls and parapet walls. The time of setting ranges from 1.5-24 min / hour. The compressive strength ranges from 1800-2800 psi (13 to 20 Mpa). It is best suitable for substructures such as masonry foundations, retaining walls, sewers, manholes etc. 90011 Cement mortar used for Plastering (Source YouTube-Piotr Kaminski) 90052 Type M mortar 90053 90002 It consists of highest amount of Portland cement with compressive strength ranging from 1800-3000 psi (13- 21 MPa). It can bear heavy loads and can be used for driveways, heavy foundation, retaining wall etc.90011 Cement mortar used for laying of bricks (Source YouTube-Слава Храмцов) 90030 Admixtures used in Cement Mortar 90031 90052 Plasticizers 90053 90002 The requirement of right workability is the main essence of good concrete. Addition of extra water increases the workability of concrete but results in concrete cancer and segregation. To overcome this, 90003 Plasticizers 90004 (also known as 90003 water reducers 90004) are used. They impart plasticizing effect in wet concrete and increase the workability of concrete without using excess of water.The plasticized concrete improves the desirable quality of plastic concrete and naturally increases the strength of concrete. Plasticisers are generally used in the amount of 90003 0.1% to 0.4% 90004 by weight of cement which results in 90003 5% to 15% 90004 reduction in mixing water. 90011 90052 Super plasticizers 90053 90002 90003 Super plasticizers 90004 are improved and more enhanced chemical admixtures with highly effective plasticizing effects on wet concrete. Super plasticizers are chemically different from normal plasticizers.It allows the reduction of water up to 90003 30% 90004 without affecting the workability of mortar. It also has additional advantages such as self-levelling, self-compacting and produce high strength and high performance concrete. 90011 90052 Polyvinyl Acetate (PVA) 90053 90002 Bonding type admixtures are basically water emulsions of various organic materials which are mixed with cement or mortar grout and applied over the old surface prior to patching with mortar or concrete. The polymers used as admixtures as 90003 Polyvinyl chloride and Polyvinyl Acetate 90004.The main function of this admixture is to increase the bond strength between old and new concrete surfaces. They are added in proportions of 90003 5% to 20% 90004 by weight of cement. These admixtures are effective only on clean and sound surfaces. 90011 90052 Waterproofing Admixtures in Cement Mortar 90053 90002 Certain additives are added to the concrete to make the structure water resistance. This is generally achieved by either 90003 water repelling agent or pore filling agent 90004. In water repelling type materials like 90003 Soda, Potash soaps, Calcium soaps, vegetable oils, fats, waxes and coal tar residues 90004 are used.They act as water repellents which makes the concrete impervious. In Pore filling type materials like 90003 Silicate of soda, Aluminium & Zinc sulphates, and Aluminium & Calcium chloride 90004 are used. These materials are chemically active pore fillers. Chemically Inactive pore fillers are also used in market such as 90003 earth fullers, chalk and talc 90004. In addition, they also help accelerate the setting time of concrete. 90011 90002 90052 90337 Related 90338 90053 90011.